Negative Effects Of Technology On Cell Phones - 807 Words

With the growth of new technology, society is becoming too dependent on cell phones. Although communication and information may be important over a screen, it may take away from interaction in society. Overuse can cause negative side effects when it is not available as well as take away the overall experience of life itself. Cellular technology has contributed to negative and positive factors. It is best to view each side and understand how to best use it for a healthy lifestyle. To begin with, skills such as oral communication and face to face conversations are crucial to success and understanding how to interact in society today. With the overwhelming amount of young people over using their phones, face to face communication might be†¦show more content†¦Given these points, they strongly correlate with how they reveal the dependence on cell phones and that they contribute to psychological effects in the most unwilling and detrimental ways. Lastly, cell phones can take away experiencing life. Getting outside and going beyond a screen can be seen almost as therapy for people who get everything out of their phone. Breathing fresh air, going on a trip, being with the people who love you most can be a life changer and can present how much life has to offer without depending on technology. Mentally taking a break from cellular technology and social media included can bring down levels of stress and can help an individual connect with who they are as well others. Ultimately, everyone should take a break from their phones and screens to really see beyond the painted picture. It’s importance truly shows how generations change with times continuance. Given these points, cellular devices have also contributed to some of the easiest accessible information and communication ever possible. Cell phones have enriched international communication and access to information revolutionizing the way humans are able to interact. Cell phones allow conversations to be taken through text and over the phone providing easier access to communication without the need to be face to face. Information can also be accessed efficiently withoutShow MoreRelatedEffects Of Technology On Society s Society1246 Words   |  5 Pages Effects of Technology on Society Many years ago, historians believe the future would be an amazing technologically advanced place filled with robots and time traveling. But today no one seems to be shocked by all of the advancements (Negative Effects of Technology). The computers are controlling minds, and humans are acting more as robots than citizens. Over the last few decades, there has been a dramatic improvement in the development and use of technology. Workplaces have goneRead MoreNegative Effects of Cell Phones1731 Words   |  7 PagesTechnology is anything that people use to make a task easier. A cell phone is a type of technology that is a common thing to see in everyday life. 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Many school’s policies on the use of technology vary depending on the type of education system. The statistics given based on whether cell phone use is permitted at school is oftentimes used to support one side of the argument. People tend to lean towards a specific sideRead MoreEffects Of Overuse Of Technology On Human Health1253 Words   |  6 PagesEffects of overuse of Technology on Human Health Technology has become a major part of human activities today. People engage in different activities through the use of technology for communication, traveling, and different devices used in every career. Despite the fact that technology has eased the performance of different tasks, it has a detrimental effect on human health. It has an effect on people across all ages and results in health effects such as depression, obesity, brain tumors, musculoskeletalRead MoreTechnology And Its Effect On Communication955 Words   |  4 PagesTechnology has changed the way individuals communicate and limits the number of face-to-face conversations. Technology affects the way individuals keep in contact with one another and it has taken over people’s lives. People have become more dependent on technology to function every day, and without it, their lives are incomplete. However, technology does not negatively affect communication in some circumstances. Miscommunication, emotional intelligen ce, and information technology are key characteristicsRead MoreIncreasing Usage Of Cell Phones1174 Words   |  5 PagesAbstract Smart phone allows us to communicate with the people who we wish to stay connected with. Nowadays due to the over usage of cell phones we often find ourselves wasting too much time on it, obesity growing in teenagers, distant relationships with people etc. after researching we found that the increasing usage of cell phone has a great effect on students studying in high schools or collages such as their behavior, dropping grades etc. Concerns about dependency on mobile phones corresponded toRead More Impact of Technology on Family Life Essay901 Words   |  4 PagesImpact of Technology on Family Life I think that technology has had both positively and negatively impacted the family life in our society. But I think the positive effects out way the negative ones. In this term paper I will focus on how cell phones, internet, and home security systems. These are only a few of the technology that has affected family life. I will first talk about the positive effects then I will explain the negative effects. Communication has had a bigRead MoreA Life Threatening Habit : Using Drugs And Alcohol1665 Words   |  7 PagesEnglish II 9 May 2016 A Life Threatening Habit Using a cell phone may be equivalent to using drugs and alcohol. Addiction to cell phones is a worldwide problem. There are many negative effects that teenagers do not know and that will cause harm in long term usage. For some, using their cell phone is a way out of reality and an escape from the outer lives. Social media is becoming more popular every year which is attracting younger kids. The cell phone is a trap to the next generation and will create problems

Research Methodology Research Project - 1402 Words

RESEARCH METHODOLOGY 1. RESEARCH PARADIGM Stating a knowledge claim means that researchers start a project with certain assumptions about how they will learn and what they will learn during their enquiry. These claims might be called as paradigms (Lincoln Guba, 2000; Mertens, 1998); philosophical assumptions, epistemologies, and ontologies (Crotty, 1998); or broadly conceived research methodologies (Neuman, 2000). Philosophically, researchers make claims about what is knowledge (ontology), how we know it (epistemology), what values go into it (axiology), how we write about it (rhetoric), and the processes for studying it (methodology) (Creswell, 1994). The researcher brings to the choice of a research design assumptions about the knowledge in claims. In addition, operating at more applied level are strategires of inquiry or traditions of inquiry (Creswell, 1998) or methodologies (Mertens, 1998) that provide specific direction of procedures in research design. QUANTITATIVE QUALITATIVE MIXED METHODS 1.Experimental designs Narratives Sequential 2.Non-experimental designs such as surveys Phenomenologies Concurrent Ethnographies Transformative Grounded theory Case studies Table: Alternative stratagies of inquiry 2. APPROACHES TO RESEARCH This section highlights the main aspects of Research design whereby research approaches and their associated methods are explored in depth. 2.1 Quantitative approach A quantitative approach is generally applied in the testing orShow MoreRelatedA Research Project Management Methodologies1627 Words   |  7 PagesReflection Today, Scrum methodology is one of the most adopted/ popular project management methodologies out there. It is recognised as a simple to follow framework, but effective in terms of productivity, scalability and flexibility with change. The scrum adopts an empirical approach which bases on the idea that the problem cannot be fully understood or defined. So the framework focuses on maximising the team’s ability to deliver quickly while adapting and responding to emerging requirements. IRead MoreResearch Methodology On Agile Project Management1734 Words   |  7 Pages3. Methodology Chapter 3.1 Introduction to Methodology The purpose of this chapter is to describe the research methodology used in completing this dissertation. This chapter starts out by describing the initial research and literature review that was performed and then further describe with relevant research methodology. A research method is being selected and explained. A sample of questionnaire and interview questions can be obtained in Appendix. 3.2 Prestudy and Approach ( Literature Review )Read MoreTheory Behind The Method And The Methodology Of A Research Project2583 Words   |  11 Pages3.0 Methodology It has been stated by Van Manen (1990) that the methodology is the framework of any research, It is suggested that the methodology is the theory behind the method and the methodology aids the researcher in deciding upon a research method. 3.1 Research Philosophy Easterby-Smith et al. (1997) highlights the importance of the physiological issues when designing a research project as it could affect the overall quality of the work. Three reasons of the importance of research philosophyRead MoreProject Report of Research Methodology on Comparative Study of Bajaj V/S Hero Honda4468 Words   |  18 PagesPROJECT REPORT OF RESEARCH METHODOLOGY ON COMPARATIVE STUDY OF BAJAJ V/S HERO HONDA SUBMITED TO SUBMITED BY Prof. Neha bansal Vishal jaggi Roll No.820375073 MBA 4th Semester 1 CERTIFICATE This is to certify that Mr. Vishal jaggi has completed his project report title â€Å"Comparative Study of Bajaj V/S Hero Honda† under my supervision. To the best of my knowledge and belief this is his original work and this, wholly or partially, has not been submitted for any degree of this or any other UniversityRead MoreResearch: Scientific Method and Social Care1464 Words   |  6 Pagesfront sheet Qualification Unit number and title BTEC L3 : Health and social care Year 1 Unit 22: Research Methodology for Health and Social Care Learner name Assessor name Nadia Anderson, Shauna Silvera Date issued Deadline Submitted on September 2013 (Individual issue dates set throughout the year) July 2014 (Individual deadline dates set throughout the year) Assignment title Research Methodology for Health and Social Care In this assessment you will have opportunities to provide evidenceRead MoreDifferent Types Of Research Methodologies975 Words   |  4 PagesResearch Methodologies With the various types of research methodologies, one can classify them as medical, social, computer, or life science research. However, in computers and bioinformatics research methodology, the methods used are computational, computer simulation, iCloud, omics, and theoretical. Before starting any research, a literature review is required, for example, magazines, books, scholarly/peer reviewed journals, company sales, customer, and employee records. If in the medical fieldRead MoreSurvey Paper961 Words   |  4 Pagesa problem statement that unambiguously identifies and defines the problem to research. Sekaran (2003) said, â€Å"No amount of good research can find solutions to the situation, if the critical issue or the problem to be studied is not clearly pinpointed† (p. 69). The area of research for this paper focuses on software development, in particular, the study of agile software development methodologies and if these methodologies are successful in delivering softwa re on time, within budget, and includes theRead MoreProject Management Scheduling1657 Words   |  7 PagesTitle Successful Project Management Scheduling outcomes: A Theoretical Comparative Analysis of networking techniques between Event, Chain with other traditional methodologies Research Question Why it is important to conduct a comparative analysis of Event, Chain with other traditional methodologies and investigate how it contributes in being Successful scheduling techniques in Project Management discipline? Introduction to Dissertation Nowadays, Project scheduling plays lot of benefactorRead MoreExistence Of Agile Team Environment1482 Words   |  6 PagesHypothesis 1 H0: Existence of agile team environment will not help to increase the success rate of the project H1: Existence of agile team environment will help to increase the success rate of the project. Based on hypothesize one the One-Sample T-Test Output is presented below. This output consists of two parts: one of them is One-Sample Statistics and the other one is One Sample Tests. Result from The One-Sample Statistics is explained as sample size is presented as (N), mean, standard deviationRead MoreResearch On Scientific Communication And Research1672 Words   |  7 Pagesand Systems Sciences Course: Scientific Communication and Research Methodology FMVEK project 7.5 credits Autumn term 2014 Course instructor: Matti Tedre Facilitator: Ranil Peiris Colombage Table of Contents Abstract 3 1. Introduction 3 1.1 Background 3 1.2 Research objectives 4 1.3 Research Questions 4 1.4 Limitations of the study 4 2. Methodology 5 2.1 Data Collection Methods 5 2.2 Participants / Sampling 6 2.3 Data Analysis 7 2.4 Research Ethics 7 3. Results 9 3.1 Data Collection and Analysis 9

Defining Customer Satisfaction free essay sample

Defining customer satisfaction Because the concept of customer satisfaction is new to many companies, its important to be clear on exactly whats meant by the term. Customer satisfaction is the state of mind that customers have about a company when their expectations have been met or exceeded over the lifetime of the product or service. The achievement of customer satisfaction leads to company loyalty and product repurchase. There are some important implications of this definition:    Because customer satisfaction is a subjective, nonquantitative state, measurement wont be exact and will require sampling and statistical analysis. Customer satisfaction measurement must be undertaken with an understanding of the gap between customer expectations and attribute performance perceptions. There should be some connection between customer satisfaction measurement and bottom-line results. Satisfaction itself can refer to a number of different facts of the relationship with a customer. For example, it can refer to any or all of the following:    Satisfaction with the quality of a particular product or service    Satisfaction with an ongoing business relationship Satisfaction with the price-performance ratio of a product or service    Satisfaction because a product/service met or exceeded the customers expectations Each industry could add to this list according to the nature of the business and the specific relationship with the customer. Customer satisfaction measurement variables will differ depending on what type of satisfaction is being researched. For example, manufacturers typically desire on-time delivery and adherence to specifications, so measures of satisfaction taken by suppliers should include these critical variables. Clearly defining and understanding customer satisfaction can help any company identify opportunities for product and service innovation and serve as the basis for performance appraisal and reward systems. It can also serve as the basis for a customer satisfaction surveying program that can ensure that quality improvement efforts are properly focused on issues that are most important to the customer. Break-down of the Definition of Customer Satisfaction Customer satisfaction is a measure of how well our†¦ PRODUCTS- Products including physical products and services. SERVICE- Customer service post sale. This includes responding to customer queries and issues. SUPPORT- Repair, maintenance and upkeep of your products post sales. ENGAGEMENET- Engaging with customer, apart from the above mentioned contexts (product, service and support). This includes offering new products, schemes, up-sell and cross-sell. †¦are able to meet the customer†¦ EXPECTATIONS- Customer satisfaction is your delivery vis-a-vis the expectations. The way a customer interprets your delivery also defines customer satisfaction. Customer satisfaction is driven by how well you manage your delivery and how well you manage customer expectations. Purpose of customer Satisfaction: A business ideally is continually seeking feedback to improve customer satisfaction. Customer satisfaction provides a leading indicator of consumer purchase intentions and loyalty. Customer satisfaction data are among the most frequently collected indicators of market perceptions. Their principal use is twofold: 1. Within organizations, the collection, analysis and dissemination of these data send a message about the importance of tending to customers and ensuring that they have a positive experience with the company’s goods and services 2. Although sales or market share can indicate how well a firm is performing currently, satisfaction is an indicator of how likely it is that the firm’s customers will make further purchases in the future. Much research has focused on the relationship between customer satisfaction and retention. Studies indicate that the ramifications of satisfaction are most strongly realized at the extremes. On a five-point scale, individuals who rate their satisfaction level as â€Å"5† are likely to become return customers and might even evangelize for the firm. A second important metric related to satisfaction is willingness to recommend. This metric is defined as The percentage of surveyed customers who indicate that they would recommend a brand to friends. When a customer is satisfied with a product, he or she might recommend it to friends, relatives and colleagues. This can be a powerful marketing advantage. ) Individuals who rate their satisfaction level as â€Å"1,† by co ntrast, are unlikely to return. Further, they can hurt the firm by making negative comments about it to prospective customers. Willingness to recommend is a key metric relating to customer satisfaction. Factors affecting customer satisfaction Customer satisfaction is the overall impression of customer about the supplier and the products and services delivered by the supplier. Following are the important factors that could affect customer satisfaction: * Department wise capability of the supplier. * Technological and engineering or re-engineering aspects of products and services. * Type and quality of response provided by the supplier. Supplier’s capability to commit on deadlines and how efficiently they are met. * Customer service provided by the supplier. * Complaint management. * Cost, quality, performance and efficiency of the product. * Supplier’s personal facets like etiquettes and friendliness. * Supplier’s ability to manage whole customer life cycle. * Compatible and hassle free functions and operations. | | The above factors could be widely classified under two categories i. e. s uppliers behavior and performance of product and services. The supplier’s behavior mostly depends on the behavior of its senior subordinates, managers and internal employees. All the functional activities like customer response, direct product and maintenance services, complaint management etc. are the factors that rely on how skillful and trained the internal and human resources of the supplier are. The second category is regarding all the products and services. This depends on the capability of supplier to how to nurture the products and service efficiently and how skilled the employees are. It’s all about how the skills are implemented to demonstrate engineering, re-engineering and technological aspects of the products and services. The quality and efficaciousness of the products is also an important factor that enables compatible and hassle free functions and operations. This bears to lower maintenance and higher life of the product which is highly admired by the customers. If the product is having some problem or compatibility issues and requires frequent maintenance and support than the customers could get irritated and possibilities of sudden ivert is there which lead to supplier’s financial loss. In the same way if the product is expecting huge amount of financial and manual resources then customers could get a feeling of dissatisfaction and worry. However, if these aspects are handled efficiently by giving class services and dealing with complaints effectively then dissatisfied customers could be converted into long time satisfied customers and retai ning them becomes easy. It is practically impossible for the supplier to provide all the above explained features. There are always some positive as well as negative features in products and services which could lead to delight or irritate customers. The final opinion is the sum of overall experiences which a customer percept. But it is also true that more the positive aspects, the more the customer is satisfied. Hence the aim of the supplier should be always to enhance these positive feelings among all the customers to increase customer satisfaction. The supplier must identify how to enhance these positive aspects to maximum level by analyzing the customer’s data and information using CRM system. The individual liking and disliking of customers differ from customer to customer. It is hence required to target a customer and identify individual requirement to make them satisfied. Having discussed the above factors that affect customer satisfaction we can say that higher the satisfaction level, higher is the sentimental attachment of customers with the specific brand of product and also with the supplier. This helps in making a strong and healthy customer-supplier bonding. This bonding forces the customer to be tied up with that particular supplier and chances of defection are very less. Hence customer satisfaction is very important panorama that every supplier should focus on to establish a renounced position in the global market and enhance business and profit. According to Adrian Thompson Customer Satisfaction in 7 Steps 1. Encourage Face-to-Face Dealings This is the most daunting and downright scary part of interacting with a customer. If one does not used to this sort of thing it can be a pretty nerve-wracking experience. Rest assured, though, it does get easier over time. It’s important to meet customers face to face at least once or even twice during the course of a project. According to Adrian experience has shown that a client finds it easier to relate to and work with someone they’ve actually met in person, rather than a voice on the phone or someone typing into an email or messenger program. When you do meet them, be calm, confident and above all, take time to ask them what they need. I believe that if a potential client spends over half the meeting doing the talking, you’re well on your way to a sale. 2. Respond to Messages Promptly Keep Your Clients Informed This goes without saying really. We all know how annoying it is to wait days for a response to an email or phone call. It might not always be practical to deal with all customers’ queries within the space of a few hours, but at least email or call them back and let them know you’ve received their message and you’ll contact them about it as soon as possible. Even if you’re not able to solve a problem right away, let the customer know you’re working on it. .3. Be Friendly and Approachable It’s very important to be friendly, courteous and to make your clients feel like you’re their friend and you’re there to help them out. There will be times when you want to beat your clients over the head repeatedly with a blunt object – it happens to all of us. It’s vital that you keep a clear head, respond to your clients’ wishes as best you can, and at all times remain polite and courteous. 4. Have a Clearly-Defined Customer Service Policy This may not be too important when you’re just starting out, but a clearly defined customer service policy is going to save you a lot of time and effort in the long run. If a customer has a problem, what should they do? If the first option doesn’t work, then what? Should they contact different people for billing and technical enquiries? If they’re not satisfied with any aspect of your customer service, who should they tell? There’s nothing more annoying for a client than being passed from person to person, or not knowing who to turn to. Making sure they know exactly what to do at each stage of their enquiry should be of utmost importance. So make sure your customer service policy is present on your site — and anywhere else it may be useful. 5. Attention to Detail (also known as ‘The Little Niceties’) Have you ever received a Happy Birthday email or card from a company you were a client of? Have you ever had a personalized sign-up confirmation email for a service that you could tell was typed from scratch? These little niceties can be time consuming and aren’t always cost effective, but remember to do them. Even if it’s as small as sending a Happy Holidays email to all your customers, it’s something. It shows you care; it shows there are real people on the other end of that screen or telephone; and most importantly, it makes the customer feel welcomed, wanted and valued. 6. Anticipate Your Client’s Needs Go Out Of Your Way to Help Them Out Sometimes this is easier said than done! However, achieving this supreme level of understanding with your clients will do wonders for your working relationship. 7. Honour Your Promises It’s possible this is the most important point in this article. The simple message: when you promise something, deliver. The most common example here is project delivery dates. Clients don’t like to be disappointed. Sometimes, something may not get done, or you might miss a deadline through no fault of your own. Projects can be late, technology can fail and sub-contractors don’t always deliver on time.

Mechanics of Material Lab Manual free essay sample

To investigate how shear strain varies with shear stress. c. To determine the Modulus of Rigidity of the rubber block. 4. Hooke’s Law for Wires a. To determine the Youngs Modulus of Elasticity of the specimen wire. b. To verify Hookes Law by experiment. 5. Strain in Compound Wires a. To determine the modulus of elasticity of two wires and hence evaluate the equivalent Young’s Modulus of Elasticity of the combination b. To position the single applied load on the slotted link in order that both wires are subjected to common strain and hence to establish the load in each wire 6. Deflection of a simply supported beam To find the slope and deflection of a simply supported beam with point load at the center and to prove the results mathematically 7. Deflection of a cantilever beam To verify the slope and deflection of a cantilever beam experimentally and theoretically. 8. Deflection of a overhanging beam To find the central deflection of overhanging arm beam and confirm the results theoretically 9. We will write a custom essay sample on Mechanics of Material Lab Manual or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Shear center for a channel Find Shear center for a channel section cantilever. 10. Unsymmetrical Deflections To determine the deflections for symmetrical bending of an angle section beam 1. Shear Forces and Bending Moment in Beams To measure the bending moment at a normal section of a loaded beam and to check its agreement with theory 12. Study and Application of experimental photoelasticty techniques on linear crack propagation analysis 13. Direction and magnitude of principal stresses To use the Photo-elasticity as an experimental technique for stress analysis and to understand construction and operation of transmission polariscope. 14. Calculation of stress intensity factor Interpretation of Fringe Data and calculation of stress intensity factor (k) at different loading conditions 5. Micro Hardness Testing 16. Thin Cylinder Experiment No. 1Compression of a spring 1. OBJECTIVES a) To obtain the relation among the force applied to an extension spring and its change in length. b) To determine the stiffness of the test spring (s). 2. PROCEDURE a) Setup the apparatus vertically to the wall at a convenient height. b) Add increasing loads to the load hanger recording to the corresponding deflection for each load. c) Continue loading until at least 30 mm of extension has been achieved. 3. RESULTS Tabulate the results obtained and draw a graph of load (y-axis) against extension (x-axis). Note the following data for each spring used:- a. Outside diameter, b. Effective length, c. Wire diameter, d. Number of turns. The stiffness to the spring is the force required to produce a nominal extension of 1 mm. [pic] If Kg masses are used: The force applied to the spring in Newtons = Mass in Kg x 9. 81. 4. POINTS TO PONDER a. What relationship exists between the applied force and compression? b. Did the spring (s) behave according to Hooke’s Law? c. State the stiffness value (s) obtained. d. If the graph drawn does not pass through the origin state why. Experiment No. 2 Extension of a spring . OBJECTIVES a. To obtain the relation among the force applied to a compression sping and its change in length. b. To determine the stiffness of the test spring (s) 2. PROCEDURE a. Setup the apparatus vertically to the wall at a convenient height. b. Add increasing weight to the load hanger recording to c. the corresponding deflection for each load. d. Continue loading until at least 30 mm of compression has e. been achieved. 3. RESULTS Tabulate the results obtained and draw a graph of load (y-axis) against compression (x-axis). Note the following data for each spring used :- e. Outside diameter, f. Effective length, g. Wire diameter, h. Number of turns. The stiffness to the spring is the force required to produce a nominal extension of 1 mm. [pic] If Kg masses are used: The force applied to the spring in Newtons = Mass in Kg x 9. 81. 4. POINTS TO PONDER a. What relationship exists between the applied force and compression? b. Did the spring (s) behave according to Hooke’s Law? c. State the stiffness value (s) obtained. d. If the graph drawn does not pass through the origin state why. Experiment No. 3 Rubber in Shear 1. OBJECTIVES 1. To determine the variation of deflection with applied load. . To investigate how shear strain varies with shear stress. 3. To determine the Modulus of Rigidity of the rubber block. 2. PROCEDURE 1. Set-up the apparatus securely to the wall at the convenient height 2. Note the initian dial gauge reading. 3. Add increasing increments of load and recird the corresponding deflections registered on the dial gauge. 4. Tabulate the results and draw a graph of deflection (x-axis) against applied load (y-axis). Describe the relationship between the deflections and the applied load. State if this follows a linear law. 3. Observations and Calculations: Load (W) |Deflection |Shear Stress |Shear Strain | | |X |= W/A |=X/L | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Modulus of rigidity of the rubber block = shear stress/ shear strain = slope of graph |Data |Dimensions (Metric) | Dimension of block |150*75*25 mm | |Dial Gauge |12 mm travel * . 01 mm | |Load Hanger |250 mm * 2 N | |Max. Load |160 N (16 kg) | Experiment No. 4 Hooke’s Law for Wires Objectives: 1. To determine the Young’s Modulus of Elasticity of the specimen wire. 2. To verify Hooke’s Law by experiment. 3. To establish a value for the ultimate stress of the wire. [pic] Procedure: 1. Note the length (L), diameter (d) and the material of the wire under test. 2. Add sufficient initial load to the hanger to remove the flexure of the specimen. 3. Let the scale measurement now showing be the zero position. 4. Add equal increments of load to the hanger and note the corresponding total extension (x) for each case. 5. Care should be taken to ensure that the elastic limit of the material is not exceeded. 6. Tabulate the results and draw a graph of load (W) against extension (X). 7. Continue to load the specimen until fracture occurs. Note the breaking load. Observations and Calculations: |S/No. Load (N) |Stress (N/m2) |Extension(mm) |Strain |Young’s Modulus (Y) | |BRASS | |1 | | | | | | |2 | | | | | | |3 | | | | | | |4 | | | | | | |5 | | | | | | |STEEL | |1 | | | | | | |2 | | | | | | |3 | | | | | | |4 | | | | | | |5 | | | | | | Young’s Modulus of elasticity E/xA = WL Ultimate Stres s = Total Load at fracture / area of wire General Questions 1. State Hooke’s Law. Did the extension of the wire under test confirm to Hooke’s Law? 2. Quote the values obtained for E and the ultimate stress and compare these with the normally accepted values for the material. Experiment No. 5 Strain in Compound Wires Objectives: 1. To determine the Module of Elasticity of the two wires and hence evaluate the equivalent Young’s Modulus of Elasticity of the combination. 2. To postion the single applied load on the slotted link in order that both wires are subjected to common strain and hence to :- 3. Establish the load in each wire. 4. To obtain an experimental value of the equivalent Young’s Modulus of elsticityof the combination. 5. To compare the experimental and theoretical results. Procedure: 1. Note the length and the diameter of each wire and the distance between their centers. 2. Remove the slotted link and suspend the hanger from the lower and of the slide attached to one of the wires. 3. Apply a range of increasing loads and note the corresponding extension of the wire. 4. Do not allow the wire to exceed its elastic limit. 5. Plot a graph of load against extension, and from the slope of the straight-line graph, determine the value of Young’s Modulus of Elasticity of the wire. a. Repeat this procedure for the other wire. b. Replace the slotted link and suspend the hanger from its edge placed at the center of the link. The length of one of the wires may require to be adjusted until the link is level. Small adjustment to the length of either one of the wires may be obtained by applying a supplementary load to its slide using another hanger. Place a load (W) on the central hanger and maintain a common extension in the wires (i. e. level condition) by adjusting the position of the knife-edge on the link. Note the new position of the load measured from the center of the left-hand wire. Note the magnitude of the applied load and the common extension of the wires. Repeat over a range of increasing loads. Tabulate the results and plot a graph of the load (W) against the extension (X) of the compound wire arrangement. Diagram and calculations: |S/No. Force (N) |fs (MPa) |fb (MPa) |fe (MPa) |ee * 10^-4 |Ee (Pa) * 10^10 | |1 | | | | | | | |2 | | | | | | | |3 | | | | | | | |4 | | | | | | | |5 | | | | | | | Experiment No. 6 Deflection of a simply supported beam OBJECTIVES To find the slope and deflection of a simply supported beam with point load at the centre and prove the results mathemati cally. APPARATUS 5. HST 6:1 with complete accessories 6. Vernier caliper, micrometer, meter rod, etc. [pic] PROCEDURE 1. Set up the two end supports at 1m span and insert the thick steel beam in the end and fixtures. 2. Place a load hanger and clamp at mid span and set up a dial gauge to measure the deflection at the load point. 3. Check that the end supports are free top rotate as the beam deflects. 4. Read the support rotation gauge and central deflection gauge. 5. Add load by increments of 1N up to 10 N recording the dial gauge reading and then move the load by the same decrements to obtain a duplicate set of readings. 6. Plot the end rotations and central deflection against the load. Observations and Calculations: |S/NO. |LOAD (N) |Slope |Deflection |Theoretical |Theoretical slope | | | | | |deflection | | | | |central |central |Y = |? | | | | | |WL3/48EI |WL2/16EI | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Experiment No. 7 Deflection of a cantilever beam OBJECTIVE To verify the slope and deflection of a cantilever beam experimentally and theoretically. APPARATUS 1. HST 6:1 with complete accessories 2. Vernier Caliper, micrometer, meter rod etc. [pic] PROCEDURE 1. Clamp the thicker steel strip (2. 64 mm) in the position shown in diagram so that it forms a cantileve r. 2. Fix the hanger clamp (0. 3m) from the fixed support and setup a dial guage over it. 3. Apply a load in increments of 1 /2 N up to about 5N reading the gauge at each load. 4. Plot a graph of deflection against load Observations and Calculations: |S/NO. LOAD (N) |Slope |Deflection |Theoretical |Theoretical slope | | | | | |deflection | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | RESULTS: 1. From the graph obtained, the best fit linear relationship between displacement and load the steel strip, compares the graidient with the theoretical value. 2. Comment on the accuracy of the theoretical results. Experiment No. Deflection of an overhang beam To find the deflection of overhanging arm beam and confirm the results theoretically OBJECTIVE To verify the slope and deflection of a overhang beam experimentally and theoretically. APPARATUS 3. HST 6:1 with complete accessories 4. Vernier Caliper, micrometer, meter rod etc. PROCEDURE 5. Clamp the thicker steel strip in the position shown in diagram so that it forms a overhang. 6. Fix the hanger clampahead from the roller support and setup a dial guage over it. 7. Apply a load in increments of 1 /2 N up to about 5N reading the gauge at each load. 8. Plot a graph of deflection against load Observations and Calculations: |S/NO. LOAD (N) |Slope |Deflection |Theoretical |Theoretical slope | | | | | |deflection | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | RESULTS: 3. From the graph obtained, the best fit linear relationship between displacement and load the steel strip, compares the graidient with the theoretical value. 4. Comment on the accuracy of the theoretical results. Experiment No. 9. Shear center for a channel OBJECTIVE To determine the share centre of a channel section cantilever and to draw the graph between notch distance and gauge readings. APPARATUS 7. Unsymmetrical cantilever 8. Rigid based plate, weights 9. String, pulley 10. Calibrated ring 11. Grid, two dial gauges PROCEDURE: 7. Turn the routable head, so that the cantilever section is positioned relative to the pulley. 8. Fit the share assessory to the top of the cantilever and turn the dial gauge so that they rest against the attachment. The grooves in the notched bar have the spacing of 5 mm. 9. Turn the scales of the dial gauges until they read zero. 10. Tie the string to the left hand notch. Move the pulley to the left and hang the weight hanger on the end of the string. Put a weight of 1 Kg on the hanger so that the total weight is 1,5Kg. 11. Adjust the pulley position until the string is parallel to the lines on the pulley bracket. Record the reading of the both dial gauges. 12. Move the string to the next notch. Readjust the pulley position, Record the dial gauges readings. 13. Repeat for each notch position. Results: Experimental position of Shear Center from the outside of the web. Theoretical position Channel Shear Center is h = B-2 A-2 t / IA Experiment No. 10 Unsymmetrical Bending of a Cantilever Beam |Direction of pull|Displacement |Applied load (Kg) | |(degrees) | | | | | |. 5 |1. 0 |1. 5 |2. 0 |2. 5 |3. | |0 |U | | | | | | | | |V | | | | | | | |22. 5 |U | | | | | | | | |V | | | | | | | |45 |U | | | | | | | | |V | | | | | | | |67. |U | | | | | | | | |V | | | | | | | |90 |U | | | | | | | | |V | | | | | | | |112. 5 |U | | | | | | | | |V | | | | | | | |135 |U | | | | | | | | |V | | | | | | | |157. |U | | | | | | | | |V | | | | | | | |180 |U | | | | | | | | |V | | | | | | | |Direction of pull|Displacement |Applied load (Kg) | |(degrees) | | | | | |. 5 |1. 0 |1. 5 |2. 0 |2. 5 |3. 0 | |0 |L | | | | | | | | |R | | | | | | | |22. |L | | | | | | | | |R | | | | | | | |45 |L | | | | | | | | |R | | | | | | | |67. 5 |L | | | | | | | | |R | | | | | | | |90 |L | | | | | | | | |R | | | | | | | |112. |L | | | | | | | | |R | | | | | | | |135 |L | | | | | | | | |R | | | | | | | |157. 5 |L | | | | | | | | |R | | | | | | | |180 |L | | | | | | | | |R | | | | | | | Experiment No. 11 Bending Moment in Beams |S. No. Load (N) |Balance Reading (N)/ Net Force (N) | | | |W1 |W2 |W3 | |1 | | | | | |2 | | | | | |3 | | | | | |4 | | | | | |S. No. |Load (N) |Balnce Moment (N. mm)/ Theoretical Val. |1 | | | | | |2 | | | | | |3 | | | | | |4 | | | | | Experiment No. 13 Study and Application of experimental photoelasticty techniques on linear crack propagation analysis. OBJECTIVES To familiarize the students with the Linear Elastic Fracture Mechanics in context with photoealsticity and orientation and understanding of operation off different types of polariscopes. THEORY The name photoelasticity reflects the nature of this experimental method: photo implies the use of light rays and optical techniques, while elasticity depicts the study of stresses and deformations in elastic bodies. Photoelastic analysis is widely used for problems in which stress or strain information is required for extended regions of the structure. Photo elastic stress analysis is a simple and powerful tool for design engineers that provide them with the experimental data required for validating analytical and computational designs. In using this method, a transparent plastic model of the structural part of the machine element under study is first made. Then the specimen was placed in the polariscope, and the simulating operating force was applied. When examined in the polarized light field provided by the instrument, colored fringe patterns are seen which reveal: †¢ A visible picture of the stress distribution over the whole area of the specimen. †¢ Stress distribution which is accurately readable at any point for both direction and magnitude. Two types of pattern can be obtained: isochromatics and isoclinics. These patterns are related to the principal-stress differences and to the principal-stress directions, respectively. Principles The method is based on the property of birefringence, which is exhibited by certain transparent materials. When polarized light passes through a stressed material, the light separates into two wave fronts travelling at different velocities, each oriented parallel to the direction of principal stresses(? 1,? 2) in the material but perpendicular to each other. Photoelastic materials exhibit the property of birefringence only on the application of stress and the magnitude of the refractive indices at each point in the material is directly related to the state of stress at that point. Thus, the first task is to develop a model made out of such materials. Isoclinics and isochromatics Isoclinics are the locus of the points in the specimen along which the principal stresses are in the same direction. Isochromatics are the locus of the points along which the difference in the first and second principal stress remains the same. Thus they are the lines which join the points with equal maximum shear stress magnitude. Interpretation of the Photoelastic Pattern: Once the fringes obtained by application of load on photoelasic specimen the most important step is interpretation of complete stress field. The photoelastic fringe pattern data offer suggestion to modify design to avoid from material failure. It is also helpful in reducing average stress on actual part. Complete stress field interpretation include principal stress directions as well as magnitude of stresses on different fringe order. [pic] Stimulated stress field pattern in white light for typical edge crack plate The photoelastic pattern appears as a colorful map of lines of equal color. Beginning at the lower level line of stress and progressing to areas of higher level, the colour sequence observed will be black, yellow, red, blue, yellow, red, green, yellow, red, green etc. The colour transmission from red to blue and from red to green is sharply marked. [pic] Polariscope: Polariscope: It is an instrument which consists of two polaroid plates mounted apart. The lower plate is generally fixed and is known as the polariser, while the upper plate can be rotated and is known as the analyser. Types: 1. Reflection Polariscope Particularly it is used to photoelastically stress-analyze opaque plastic parts. The part to be analyzed is coated with a photoelastic coating, service loads are applied to the part, and coating is illuminated by polarized light from the reflection polariscope. Molded-in or residual stresses cannot be observed with this technique. Fig. 13. 1 Typical reflection periscope on tripod stand 2. Transmission Polariscope. This type is useful for stress analysis if component is of transparent or glassy material. All transparent plastics, being birefringent, lend themselves to photoelastic stress analysis. The transparent part is placed between two polarizing mediums and viewed from the opposite side of the light source. In these experiments we will be only concerned with highlighting the dependence of stress distribution on geometric features, hence we can use the transparent materials and transmission type polariscope will be used. [pic] Fig. 13. 2 Transmission Polariscope Two arrangements of transmission polariscope are possible i. e. I. Plane polariscope Plane polariscope is used for direction measurement at a point of principal stresses for a specimen. The setup consists of two linear polarizers and a light source. The light source can either emit monochromatic light or white light depending upon the experiment. First the light is passed through the first polarizer which converts the light into plane polarized light. The apparatus is set up in such a way that this plane polarized light then passes through the stressed specimen. This light then follows, at each point of the specimen, the direction of principal stress at that point. The light is then made to pass through the analyzer and we finally get the fringe pattern. The fringe pattern in a plane polariscope setup consists of both the isochromatics and the isoclinics. The isoclinics change with the orientation of the polariscope while there is no change in the isochromatics. For this purpose, set the quarter wave plates on both the analyzer and the polarizer cells at position â€Å"D† (direction) to make the polariscope â€Å"plane† as shown below in fig13. 2 (b) Figure 13. 2 (a)Plane Polariscope Arrangement Figure 13. 2 (b)Pin postion at Plane Polariscope arrangement II. Circular polariscope When examining the model for determination of the stress distribution and magnitude, the polariscope must be transformed from a â€Å"PLANE† to a â€Å"CIRCULAR† operation. This is done by first making sure the clamp â€Å"A† is in the locked position and then withdrawing pins â€Å"B† on the ? wave plate from the hole â€Å"D† (direction) and rotating them until pins engage in hole â€Å"M† (magnitude). Now quarter wave plate is at 45 degrees to the polarizer-analyzer axis thus polariscope is in circular light operation Figure13. 3Circular Polariscope Arrangement(dark field) There are four different kinds of arrangements for the circular polariscope. Each arrangement produces either a dark field arrangement or a light field arrangement. In dark field arrangement, the fringes are shown by bright lines and the background is dark. The opposite holds true for the light field arrangement. Quarter Wave-Plates Arrangement |Polarizer’s Arrangement |Polariscope Field | |Crossed |Parallel |Light | |Crossed |Crossed |Dark | |Parallel |Parallel |Light | |Parallel |Crossed |Dark | Experiment No. 14 Calculation of direction and mag nitude of principal stresses using transmission polariscope. OBJECTIVES ) Application of photoelastic techniques to measure the direction of Principal Stresses at a point b) Calculation of magnitude of principal stresses by interpreting the fringe data. Apparatus Apparatus required to achieve the stated objectives are †¢ Transmission polariscope †¢ test specimen of different shapes †¢ Load measuring dial gauge †¢ Vernier Caliper and Meter Rod Construction of Transmission Polariscope: The basic polariscope consists of †¢ Rigid base frame ready to receive all of the modular accessory items. †¢ Two cells equipped with polarizing filters. †¢ Knob ‘H’ used to synchronously rotate the polarizer and analyzer (their common motion is indicated in degrees in the graduated dial). The quarter wave plate which can be used to convert plane polariscope into circular and vice versa. Fig 13. 2 show these components.. Specimen prepration: In this experi ment we are using photoelastic sheets (Polyurethane material) The photoelastic sheet was made into different specimens as stated below: a) specimen with holes drilled. b) specimen with cracks, which is manually cut c) specimens with notches Typical single edge crack specimen 2-D model is shown in fig. 14. Fig. 14. 1 PROCEDURE Measurement of Direction of Principal Stresses at a Point: To measure the direction of the principal stresses at a point in the specimen we follow the following steps: Place the specimen in the polariscope making sure that the specimen is aligned correctly within the clamps, hence avoiding any twisting of the specimen. †¢ Apply load (compressive or tensile) by turning the loading screw. †¢ Set the quarter wave plates on both the analyzer and the polarizer cells at position â€Å"D† to make the polariscope â€Å"plane† (Fig 13. 2 b). †¢ By means of knob ‘C’ rotate the analyzer until pointer â€Å"P† is positioned at 0 and 100 on the scale. †¢ Release the clamp ‘A’ if it was locked previously and by means of knob â€Å"H† rotate the whole assembly during this rotation some black and all the colored fringes will be observed to move. These black fringes which move are the isoclinics. †¢ Identify the point of measurement using a grease pencil or scriber. By means of knob â€Å"H† rotate the polarizer-analyzer assembly until a black isoclinic crosses over the marked point. At this point the axes of the polarizer and analyzer are parallel and perpendicular to the directions of the principal stresses and their directions can be seen from the scale by a pointer â€Å"V†. The rotation of the assembly may be clockwise or anti-clockwise; in order to accommodate this, sign is used with the value of this direction angle. The positive sign is used for clockwise rotation and negative is used for counter clockwise. Magnitude calculations ? The polariscope, and the digital camera are turned on ? Specimen undergoes tensile force/compressive load in Transmission Polariscope with one end fixed as in fig 13. 2 Fringes formed and photographed by digital camera ? A gradual tension was then added onto specimen and record the load reading by using dial-guage ? Print and interpret fringe pattern obtained in photographs according to the proce dure explained. Formulation for Stress Distribution: When examining the specimen for determination of the stress distribution and magnitude, the polariscope must be transformed from a â€Å"PLANE† to a â€Å"CIRCULAR† operation. This is done by first making sure the clamp â€Å"A† is in the locked position and then withdrawing pins â€Å"B† on the ? wave plate from the hole â€Å"D† (direction) and rotating them until pins engage in hole â€Å"M† (magnitude). Now quarter wave plate is at 45 degrees to the polarizer-analyzer axis thus polariscope is in circular light operation. Difference of principal stresses is given by (1 (2 = (N * C)/t Where N=fringe order at point of measurement C= stress constant of specimen material T = specimen thickness C is usually given by manufacturer. Thus the remaining number to be found is N which can be found according to color pattern as mention in the topic of interpretation of fringe pattern. CALCULATIONS AND RESULTS |S/No. |Applied load |Thickness of |Fringe Order |Direction of |Direction of |Magnitude of |Magnitude of | | |lbs/. 01 inch |specimen |‘N’ |principal stress |principal stress |principal stress |principal stress | | | |‘t’ | | |(threotcal value) | |(threotcal value) | |1 | | | | | | | | |2 | | | | | | | | |3 | | | | | | | | |4 | | | | | | | | |5 | | | | | | | | POINTS TO PONDER: 1. What will be the magnitude of shear stress at a plane of principle stress? 2. Describ e the functions of plane polriscope vs circular polriscope. 3. Describe the importance of calculation of stresses with reference to safety factor in engineering design. 4. Discuss the region of maximum stress for specimen used in experiments and explain with reasoning. 5. In case of residual stresses as a result of specimen machining which recovery method is preferable and why?