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Materials Science And Engineering Properties

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter8: Engineering Materials

Section: Chapter Questions

Problem 15ETSQ

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Question

A cylindrical rod with a diameter of 15.24 mm and a gauge length of 400mm is subjected to a tensile load. If the rod is to experience neither plastic deformation nor an elongation of more than 0.45 mm when the applied load is 31,000 N, which of the four metals or alloys listed below are possible candidates? Justify your choice(s).

Material
E (GPa)
Yield Strength (MPa)
Tensile Strength (MPa)
Steel alloy 1
Steel alloy 2
Titanium alloy
Copper
860
180
502
200
400
250
730
110
900
117
220
70

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The frame of a space shuttle type vehicle must have a high yield strength and high stillness, and the most important design factor is weight. Of all the materials presented in this chapter, what material might be the most suitable for the frame of a space shuttle? Assume that there will be both tensile and compressive stresses. For a space shuttle, cost is not a limiting factor. (a) You can eliminate entire classes of materials from consideration with a brief statement about their unsuitability. (b) What material has the highest specific yield strength? Give the yield strength, specific gravity, specific yield strength, elastic modulus, and specific elastic modulus for this material. (c) What material has the highest specific elastic modulus? Give the yield strength, specific gravity, specific yield strength, elastic modulus, and specific elastic modulus for this material. (d) Compare the materials with the highest specific yield strength and highest specific elastic modulus for suitability in the space shuttle frame. (C) Discuss the suitability of the top-rated material for this design from the viewpoint of the ability to produce a frame.
A brass alloy has a yield strength of 280 MPa, a tensile strength of 390 MPa,and an elastic modulus of 105 GPa. A cylindrical specimen of this alloy12.7 mm in diameter and 250 mm long is stressed in tension and found to elongate 7.6 mm. On the basis of the information given, is it possible to com-pute the magnitude of the load that is necessary to produce this change in length? If so, calculate the load. If not, explain why.
The strength of titanium is 448.16 MPa when the grain size is 17.02 μm and565.4 MPawhen the grain size is0.8μm. What average grain size (in nm) is required to achieve a strength of approximately 839 MPa?

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