Question 1 2 pts True or False: When designing a part to be manufactured from a polymer, in general, the design temperat
Posted: Sun May 15, 2022 9:42 pm
- Question 1 2 Pts True Or False When Designing A Part To Be Manufactured From A Polymer In General The Design Temperat 1 (203.34 KiB) Viewed 49 times
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Stretching of bonds 60 50 Engineering stress (MPa 40 Uncoiling of chains 30 20 10 0 1 6 2 3 4 5 Engineering strain (cm/cm) D. R. Askeland and W J. Wright. Essentials of Materials Science and Engineering. 4th SI Edi. Boston, USA: CENGAGE, p. 727. ISBN: 9781337629157 The Engineering Stress-Strain curve above would be typical for which type of polymeric material? Elastomer Thermoplastic O Thermoset
2 pts Question 3 True or False: The major difference in the mechanical behavior of a thermoplastic polymer compared to a metal is that the plastic deformation observed in a metal is a result of dislocation movement, whereas in a thermoplastic it is a result of the polymeric chains sliding, rotating and straightening. True False
2 pts Question 4 True or False: The major difference between a thermoset and thermoplastic is that a thermoplastic will soften and melt, whereas a thermoset will only melt when the temperature reaches the melting point. O True False
2 pts D Question 5 True or False: Compression molding is a suitable manufacturing process for a thermoplastic polymer. O True O False
Question 6 4 pts Using Granta Edupacks Material Science and Engineering database, which of the following polymers would be suitable for operation at 130 °C? O Polyethylene O Epoxies O Polystyrene O Polycarbonate O None of the above
Question 7 3 pts The stress-strain curve of an HDPE specimen will exhibit the following after necking: O A large amount of plastic deformation O Little, to no plastic deformation An increase in load O A reduction in strain as the material is viscoelastic O None of the above
D 3 pts Question 8 The bonding in a polymeric material consists of the following: O lonic and covalent bonds O Metallic and covalent bonds Van Der Waal forces and covalent bonds O Van Der Waal forces and ionic bonds O None of the above
Question 9 4 pts Using the Granta Edupack Material Science and Engineering database, answer the following question: A polymeric rod of $10 mm is designed to be loaded in tension with a force of 1240 N. The designer wishes the design to have a safety factor of 2 and needs to use a thermoplastic for this design. Which of the following polymers would be suitable? O lonomer Polycarbonate O Polyester O Polyethylene O None of the above
Question 10 4 pts Using the Granta Edupack Material Science and Engineering database, answer the following question: A polymeric rod of 610 mm is designed to be loaded in tension with a force of 300 N. The designer wishes the rod to stretch less than 0.15 mm under load. If the original length of the rod is 100 mm, which of the following materials will be suitable? O Polyethylene O Polyurethane O Polystyrene Polycarbonate O None of the above