Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Textbook Question
Chapter 1.9, Problem 35SEP
(a) Name the important criteria for selecting materials to use in a protective sports helmet. (b) Identify materials that would satisfy these criteria. (c) Why would a solid metal helmet not be a good choice?
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When answering the following questions , ensure that you explain in terms of both the microscopic and macroscopic structure of the materials. A) polymer - explain the difference in structure between a thermoplastic and thermoset material and explain how the structure accounts for the key generic properties of those polymers. B) composite material - for a particular composite and a fibre reinforce composite , explain the difference in structure and whst structual features dictate the properties of the material.
What are the key advantages and disadvantages of using composite materials in mechanical engineering applications compared to traditional materials?
CASE STUDY
A material is to be selected for the main landing-gear support for a carrier-based navy airplane. Both weight and size of the support are important considerations, as well as minimal deflection under normal landing conditions. The support must also be able to handle impact loading, both under normal landing conditions and under extreme emergency controlled-crash-landing conditions. Under crash-landing conditions permanent deformations are acceptable, but separation into pieces is not acceptable. What candidate materials would you suggest for this application?
Chapter 1 Solutions
Foundations of Materials Science and Engineering
Ch. 1.9 - What are materials? List eight commonly...Ch. 1.9 - What are the main classes of engineering...Ch. 1.9 - What are some of the important properties of each...Ch. 1.9 - Define a composite material. Give an example of a...Ch. 1.9 - Provide a list of characteristics for structural...Ch. 1.9 - Define smart materials. Give an example of such...Ch. 1.9 - Prob. 7KCPCh. 1.9 - Prob. 8KCPCh. 1.9 - Nickel-base superalloys are used in the structure...Ch. 1.9 - Make a list of items that you find in your kitchen...
Ch. 1.9 - Make a list of all the major components of your...Ch. 1.9 - Make a list of major components in your automobile...Ch. 1.9 - Make a list of major components in your computer...Ch. 1.9 - Make a list of major components in your classroom...Ch. 1.9 - Perform a search on the history of automobiles and...Ch. 1.9 - Perform a search on the history of wheels and...Ch. 1.9 - Perform a search on the history of recording media...Ch. 1.9 - Perform a search on the history of sport track...Ch. 1.9 - List some materials usage changes that you have...Ch. 1.9 - (a) What kind of material is OFHC copper? (b) What...Ch. 1.9 - (a) To which class of materials does PTFE belong?...Ch. 1.9 - Why should civil engineers be knowledgeable about...Ch. 1.9 - Why should mechanical engineers be knowledgeable...Ch. 1.9 - Why should chemical engineers be knowledgeable...Ch. 1.9 - Why should ocean engineers be knowledgeable about...Ch. 1.9 - Why should petroleum engineers be knowledgeable...Ch. 1.9 - Why should electrical engineers be knowledgeable...Ch. 1.9 - Why should biomedical engineers be knowledgeable...Ch. 1.9 - (a) To which class of materials does kevlar...Ch. 1.9 - Prob. 30AAPCh. 1.9 - Prob. 31AAPCh. 1.9 - What factors might cause materials usage...Ch. 1.9 - Consider the common household component in a...Ch. 1.9 - (a) Name the important factors in selecting...Ch. 1.9 - (a) Name the important criteria for selecting...Ch. 1.9 - Why is it important or helpful to classify...Ch. 1.9 - A certain application requires a material that...Ch. 1.9 - Give as many examples as you can on how materials...Ch. 1.9 - When selecting materials to be used inside the...Ch. 1.9 - In the sport of tennis, for optimal performance,...
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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
- A cylindrical rod having a diameter of 10.0 mm is to be deformed using a tensile load of 20,500 N. It must not experience either plastic deformation or a diameter reduction of more than 4 x 10-³mm. Referring to the materials listed below, which are/is possible candidates? Justify your choice(s). Material Magnesium alloy Brass alloy Steel alloy Modulus of Elasticity (GPa) Yield Strength (MPa) Poisson's Ration 200 0.35 0.34 0.30 45 101 207 300 400arrow_forwardQuestion:What are the advantages and limitations of the use of composite materials in engineering applications.Explain in detail.arrow_forwardA cylindrical rod 100 mm long and having a diameter of 10.0 mm is to be deformed using a tensile load of 27,500 N. It must not experience either plastic deformation or a diameter reduction of more than 7.5 x 10-³ mm. Of the materials listed as follows, which are possible candidates? Justify your choice(s). Material Aluminum alloy Brass alloy Steel alloy Titanium alloy Modulus of Elasticity (GPa) Yield Strength (MPa) Poisson's Ratio 70 101 207 107 200 300 400 650 0.33 0.34 0.30 0.34arrow_forward
- Question 1 Grade 304 stainless steel is used to manufacture a component for an industrial processing plant. Which two thermoplastic materials will you recommend as an alternative material for the manufacturing of the component? Provide reasons for your recommendationarrow_forward8. What are some of the general properties that distinguish metals from ceramics and polymers?arrow_forwardExplain how the properties and structure of different given engineering materials affect their behaviour in given engineering applications 1) Machinery such as farm equipment and packaging machines uses shear pins made from high carbon steel to prevent overload if something becomes jammed. Explain the reasons for choosing this material. 2) Titanium alloy (code Ti-6Al-2Sn-4Zr-6Mo) is widely used for aircraft engine components and chemical plant equipment. Explain why it performs well in conditions of high stress and high temperature. For each answer you must explain how the properties and structure of the material affect its performance. - include diagrams if appropriatearrow_forward
- How does the resilience of this material compare to its toughness?arrow_forwardCompare and contrast theoretical material properties of metal and composite materials.arrow_forwardA.1 (i) (ii) What other materials properties would you need to consider in choosing the best lightweighting option at higher service temperatures (400-750.C)? Based on the information you have, and your own knowledge from the course, which materials system would you now recommend for this higher temperature service application? Justify your answer. Explain why over the last 20 years, metal matrix composites have attracted much interest but have yet to achieve their full potential. Give examples of the use of metal matrix composites in automotive applications.arrow_forward
- Several applications are listed below. Determine the relative importance of resilience and toughness of the materials chosen for each application. Sort the items based on whethere resilience is most important, toughness is most important, or both are equally importantarrow_forwardWhich of the following is not an advantage of plastic over metal? Low thermal conductivity corrosion resistance comparatively low cost impact strengtharrow_forwardA cylindrical rod 500 mm long, having a diameter of 12.7 mm, is to be subjected to a tensile load. If the rod is to experience neither plastic deformation nor an elongation of more than 1.3 mm when the applied load is 29,000 N, which of the four metals or alloys listed below are possible candidates? Justify your choice(s).Material Modulus of Elasticity (GPa ) Yield Strength (MPa) Tensile Strength (MPa)Aluminum alloy 70 225 420Brass alloy 100 325 420Copper 110 210 275Steel alloy 207 450 550arrow_forward
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composite-materials; Author: Tonya Coffey;https://www.youtube.com/watch?v=Vu6ik-bcKf4;License: Standard youtube license