Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 7, Problem 52QTP
Estimate the number of molecules in a typical automobile tire, then estimate the number of atoms in the tire.
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Two students decided to print a prototype
for a gear. Student A use layer thickness
of .1 mm and an infill density of
25%. Student B use a layer thickness of
0.07 mm and an infill density of 45%.
Which student will take less time to print
the gear?
Select one:
Stu nt since the ckness of
layer is smaller and the infill density
is higher.
O We can't decide which process takes
less time
O Student A since the thickness of the
layer is larger and the infill density is
lower.
Student B because thickness is
higher than B and the infill density
has no effect on the process speed.
Student A because thickness is
higher than B and the infill density
has no effect on the process speed.
Plastics may exhibit a change in properties as they age, particularly when subjected to elevated temperatures. Material properties such as tensile strength will increase with an increasing temperature as a function of increasing time. True or false.
Define the term perfectly plastic?
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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- Use the graph depicting specific volume versus temperature for polymers to answer the following question.: Identify the curve that exhibits both a definitive glass transition temperature and melting temperature. Group of answer choices Curve A Curve B Curve Carrow_forward3. A dimension of 225.00 mm is specified for a particular injection moulded component manufactured in ABS. Calculate the corresponding dimension to which the mould cavity should be machined, using the value of shrinkage given in the table below. Typical values of shrinkage for moldings of selected thermoplastics. Shrinkage, mm/mm (in/in) Shrinkage, Plastic Plastic mm/mm (in/in) ABS Polyethylene Polystyrene 0.006 0.025 Nylon-6,6 Polycarbonate 0.020 0.004 0.007 PVC 0.005arrow_forwardLenora Manufacturing company is planning to market enamel cups. After conducting extensive market surveys, the research department provides the following estimates: a monthly demand of 200 cups at a price of $16 per cup and a monthly demand of 300 cups at a price of $14 per cup. The financial department estimates that monthly fixed costs will be $1,400 and variable costs (cost per unit) will be $4. (a) Assume that the relationship between price p and demand x is linear. Use the research department's estimates to determine the Lenora's price-demand function, p(x). (b) What would be the price per cup for an order of 260 units? (c) Find the revenue function, R(x). (d) Find the maximum revenue that the company can realize, stating the number of books that must be sold to obtain this highest revenue. (e) Assume that the cost function is linear. Use the financial department's estimates to find the cost function,C(x). (f) Find the profit function, P(x). (g) Determine, algebraically, the…arrow_forward
- An injection molded polyethylene part has a dimension of 6.25 cm. A new material, polycarbonate, is used in the same mold. What is the expected corresponding dimension of the polycarbonate molding?arrow_forwardRegarding amorphous plastics, explain why they tend to have higher tensile strength when deformed compared to when not. please include an illustrationarrow_forwardWhy some automotive components are made of ceramics? Give as many reasons as possible.arrow_forward
- Please solve only problem 3.arrow_forwardWhat materials are airplanes made out of? And is there any specific reason you should choose one material over another?arrow_forwardIf a graph is plotted between INORGANIC materials like metals, ceramics, polymers and composites against their young's Modulus.Then what will be the trend and how would you explain it?arrow_forward
- what temperatures sensonrs are best to measure the temperature of paraffin wax and why? ( give two examples )arrow_forwardUse brief sentences, sketches or calculations to answer the following questions:arrow_forwardExplain the answer and include an illustration. Why do distorted amorphous polymers have more tensile strength than their non-deformed equivalents?arrow_forward
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