Thinking Like an Engineer: An Active Learning Approach (4th Edition)
4th Edition
ISBN: 9780134639673
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: PEARSON
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Chapter 1, Problem 11RQ
- 11. What type of engineer is most likely to work on designing the fiber orientation of a composite for a new carbon fiber airplane?
- A. An
industrial engineer - B. A
mechanical engineer - C. A materials engineer
- D. An electrical engineer
- A. An
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Which statement is correct regarding the structure of polymers?
a. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymers
b. Amorphous & semi-crystalline polymers have lower strength than crystalline polymers
c. Semi-crystalline polymers are heat treated to increase the crystallinity and improve polymer strength
d. The tendency of a polymer to crystallize increases with increasing molecular weight
e. Strength increases at higher temperatures as the material softens
f. It is desirable to have a ductile-to-brittle transition temperature below room temperature
g. Degree of crystallinity and elongation at break have an inverse relationship
d) A carbon fibre reinforced composite is made using a volume fraction of 77% carbon. The material properties of the
constituent materials are listed below:
E (GPa)
Strength (MPa)
1500
900
Carbon fibre
Epoxy
60
3
The composite is loaded in tension and a Young's modulus of 12.9GPa is measured. Is this the maximum modulus
the composite can experience? Explain your answer. For a modulus of 12.9GPa, can the strength be estimated?
Explain your answer. Relevant formulae:
(4 marks)
1
E Vf
E₁
'm
Em
E = EfVf + EmVm
o = ofV₁ + 0mVm
+
Chapter 1 Solutions
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
Ch. 1 - 1. Which of these is closest to the definition of...Ch. 1 - 2. Which sentence best describes someone who is...Ch. 1 - 3. Which sentence best describes someone who is...Ch. 1 - 4. How do you Know you have chosen the right...Ch. 1 - 5. What is the goal of the Nitrogen Cycle Grand...Ch. 1 - Synthetic (human caused) conversion of nitrogen...Ch. 1 - 7. What type of engineer is likely to work on...Ch. 1 - 8. Which engineering field is primarily concerned...Ch. 1 - 9. What type of engineers are most likely to...Ch. 1 - 10. What engineer would be most likely to work on...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 16) Composite material with plastic as a matrix material can be used as biomaterials Select one: True Falsearrow_forwardCan someone assist me please? Thanks.arrow_forwardWhich statement is correct regarding the structure of polymers? O a. Degree of crystallinity and elongation at break have an inverse relationship O b. Strength increases at higher temperatures as the material softens O c. The tendency of a polymer to crystallize increases with increasing molecular weight Semi-crystalline polymers are heat treated to increase the crystallinity and improve polymer strength Amorphous & semi-crystalline polymers have lower strength than crystalline polymers Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymers O g. It is desirable to have a ductile-to-brittle transition temperature below room temperature O d. Oe. O f.arrow_forward
- Thermoplastic polymers transform into a rigid structure on cooling from a heated plastic condition. True or Falsearrow_forwardWhich of the following are incorrect regarding the crystallinity and mechanical behavior of polymers? a. As temperature is reduced, necking behavior of plastic tensile bars completely disappears b. Semi-crystalline polymers are heat treated to increase crystallinity and improve strength c. Heat treatment always results in enhanced polymer strength, modulus, and brittleness d. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stiffness under constant strain rate e. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymers f. The stress-strain curve slope for totally elastic and brittle polymers is always positivearrow_forwardWhat is the difference between thermoplastics and thermosets? A)Thermosets are cross-linked, thermoplastics are linear polymers. B)There is no significant difference. C)Thermoplastics cannot be melted, while thermosets can be. D)Thermoplastics are more elastic then thermosets.arrow_forward
- Which of the following is not an advantage of plastic over metal? Low thermal conductivity corrosion resistance comparatively low cost impact strengtharrow_forwardO Malleable iron has what type of graphite? a) Rounded graphite b) Combination worm like and rounded graphite c) Graphite nodules d) Graphite flakesarrow_forward1 An engineer is to use recycled polymer in their car mirror covering. Which of the following would be the best polymer to recycle? (A) Bakelite (B) Carbon Fibre (C) Polypropylene (D) Urea Formaldehyde albe unioonign3arrow_forward
- Hello. I was wondering if I could get help on a study question I am struggling with for my material science class. I would appreciate the help. Thanks.arrow_forwardThese are some characteristics of composite materialsChoose an optionA) They are manufactured with the intention of preserving the individual properties of each of its components.B) The matrix is the phase that is found in greater proportion and houses the dispersed phase, which is responsible for resisting mechanical stresses.C) The structural can be formed by layers or sheets forming an isotropic material.D) The alignment of the fibers in a polymeric matrix does not affect the tensile or compressive strength.arrow_forwardWhich of the following is correct regarding the degree of crystallinity of semi-crystalline polymers? Semi-crystalline polymers are heat treated to increase the crystallinity and improve polymer strength The tendency of a polymer to crystallize increases with increasing molecular weight Degree of crystallinity and tendency to creep have an inverse relationship Increasing the degree of crystallinity generally increases polymer strength, elastic modulus and ductility in semi-crystalline polymersarrow_forward
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