HW 4 MET 14400 s24

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Purdue University *

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Mechanical Engineering

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Feb 20, 2024

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Grading instructions: -1 no questions (mark as NQ) -1 overly sloppy (mark as OS) For each answer: -0 if content is similar to key answer and supporting work is shown (where applicable) -1 if content is partially similar to key answer but has some errors -2 if content differs significantly from the key answer (last, first) Name __________________ MET 14400 Materials and Processes II Spring 2024 Homework #4 – 20 points – Due 2/15 11:59pm Questions are primarily taken from DeGarmo’s Materials and Processes in Manufacturing by Black and Kohser. Lab instructions, powerpoint files, and the commodity plastics file also apply. Format: upload questions and answers as one file on BrightSpace Chapter 3 (12 th and 13 th editions) 1. You need to check the opacity of a vinyl shower curtain with a plaid pattern. What steps must be taken to prepare for the film opacity measurement? What does a reading of 40 indicate? 2. What makes a polymer a “commodity plastic”? 3. Which commodity plastics include a benzene ring in their base mer? 4. Identify at least two common polyethylene products. 5. What characteristic results in clear polystyrene yellowing with age? 6. Describe an integral (or living) hinge and identify a commodity plastic material that will work well for a product that needs a hinge that will be opened and closed at least 380 times . Chapter 8 7. (book #83) What are some reasons for creating clad composites? 8. (book #90) What are some possible fiber orientations or arrangements in a fiber-reinforced composite material? 1
9. (book #101) What are hybrid composites? 10. (book #103) What are some of the limitations that may restrict the use of composite materials in engineering applications? 11. A filament-wound pressure vessel has a total volume of 157 cm 3 . If the windings (fibers) occupy 95 cm 3 , what are the volume percentages of the reinforcement and matrix? (Hint: Total Volume = V matrix + V reinforcement ) 12. A fiber-reinforced composite has a specific weight of 4.5x10 4 lb f /in 3 . Its specific ultimate strength is listed as 12.56 in. What is the ultimate strength of the FRC? (Hint: Specific Strength = strength/(specific weight)) 2
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