Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 7, Problem 50QTP
To determine
Utilize the stress– strain curves in the figure to make a plot of the modulus of elasticity versus the temperature. Comment on the shape of the curve.
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Chapter 7 Solutions
Manufacturing Engineering & Technology
Ch. 7 - Summarize the important mechanical and physical...Ch. 7 - What are the major differences between the (a)...Ch. 7 - List properties that are influenced by the degree...Ch. 7 - What is the difference between condensation...Ch. 7 - Explain the differences between linear, branched,...Ch. 7 - What is the glass-transition temperature?Ch. 7 - List and explain the additives commonly used in...Ch. 7 - What is crazing?Ch. 7 - What are polyblends?Ch. 7 - List the major differences between thermoplastics...
Ch. 7 - What is an elastomer?Ch. 7 - What effects does a plasticizing agent have on a...Ch. 7 - Define the following abbreviations: PMMA, PVC,...Ch. 7 - Explain why it would be advantageous to produce a...Ch. 7 - What are the differences and similarities of...Ch. 7 - Are molecular weight and degree of polymerization...Ch. 7 - Why do polymers need to be dried before...Ch. 7 - What characteristics of polymers make them...Ch. 7 - Do polymers strain harden more than metals or vice...Ch. 7 - Inspect various plastic components in an...Ch. 7 - Give applications for which flammability of...Ch. 7 - What characteristics make polymers advantageous...Ch. 7 - What properties do elastomers have that...Ch. 7 - Do you think that the substitution of plastics for...Ch. 7 - Is it possible for a material to have a hysteresis...Ch. 7 - Observe the behavior of the specimen shown in Fig....Ch. 7 - Add more to the applications column in Table 7.3.Ch. 7 - Discuss the significance of the glass-transition...Ch. 7 - Prob. 29QLPCh. 7 - Explain how cross-linking improves the strength of...Ch. 7 - Describe the methods by which the optical...Ch. 7 - How can polymers be made to conduct electricity?...Ch. 7 - Explain the reasons for which elastomers were...Ch. 7 - Give several examples of plastic products or...Ch. 7 - Describe your opinions regarding the recycling of...Ch. 7 - Explain how you would go about determining the...Ch. 7 - Compare the values of the elastic modulus, given...Ch. 7 - Why is there so much variation in the stiffness of...Ch. 7 - Explain why thermoplastics are easier to recycle...Ch. 7 - Give an example where crazing is desirable.Ch. 7 - Describe the principle behind shrink wrapping.Ch. 7 - List and explain some environmental pros and cons...Ch. 7 - List the characteristics required of a polymer for...Ch. 7 - How can you tell whether a part is made of a...Ch. 7 - As you know, there are plastic paper clips...Ch. 7 - By incorporating small amounts of a blowing agent,...Ch. 7 - In injection-molding operations (Section 19.3), it...Ch. 7 - From an environmental standpoint, do you feel it...Ch. 7 - Calculate the areas under the stressstrain curve...Ch. 7 - Prob. 50QTPCh. 7 - Prob. 51QTPCh. 7 - Estimate the number of molecules in a typical...Ch. 7 - Using strength and density data, determine the...Ch. 7 - Prob. 54QTPCh. 7 - Prob. 55SDPCh. 7 - Describe the design considerations involved in...Ch. 7 - Assume that you are manufacturing a product in...Ch. 7 - Assume you work for a company that produces...Ch. 7 - Prob. 59SDPCh. 7 - Make a list of products or parts that currently...Ch. 7 - Prob. 61SDPCh. 7 - Prob. 62SDPCh. 7 - Prob. 63SDPCh. 7 - Prob. 64SDPCh. 7 - With Table 7.3 as a guide, inspect various...
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- 1. Explain in 1-3 bullets how as a practicing engineer you determine the yield strength of a thermoplastic polymer from a tensile stress-strain curve. 2. Explain what is happening at the yield strength for a thermoplastic polymer from a physical standpoint in 1-3 bullets. (e.g. what are the atoms or polymer chains doing?)arrow_forwardWhat typically happens to the strength level of a polymer that has undergone cold drawing? Why?arrow_forwardDiscuss the effect of temperature and strain rate on the mechanical properties of polymers.arrow_forward
- Explain how macroscopic plasticity occurs in polymers from the point of view of microscopic mechanisms (covered in the chapters indicated in the Callister book). (maximum of 3 lines, not counting the space for possible schematic figures).arrow_forwardGive 3 examples of a plastic product or component in which creep and stress relaxation would be important considerations.arrow_forwardA polymer sample of height 700 cm with an area of 6 m2 supports a mass of 70 tons. Youngs modulus of the polymer sample is found to be 60 GPa. Calculate the change in height of the polymer sample, applied stress and strain.arrow_forward
- At an axial load of 24 kN, a 35-mm-wide by 15- mm-thick polyimide polymer bar elongates 3.0 mm while the bar width contracts 0.15 mm. The bar is 230 mm long. At the 24-kN load, the stress in the polymer bar is less than its proportional limit. Determine (a) the modulus of elasticity. (b) Poisson's ratio. (c) the change in the bar thickness. Answers: E= = V = IN Athickness= i GPa mmarrow_forwardExpound on twinning as a mechanism for plastic deformation and include conditions for which it will take place.arrow_forwardAn extrusion operation produces continuous tubing with outside diameter = 5 cm and inside diameter = 4.25 cm. The extruder barrel has a diameter = 10 cm and length = 3 m. The screw rotates at 50 rev/min; it has a channel depth = 0.63 cm and flight angle = 16°. The head pressure has a value of 2.5 MPa and the viscosity of the polymer melt is 55 Pa-s. Under these conditions, what is the production rate in length of tube/min, assuming the extrudate is pulled at a rate that eliminates the effect of die swell (i.e., the tubing has the same OD and ID as the die profile)?arrow_forward
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