Plasticity means: The property that indicates that the material does not crack or break after a change in it The ability of a material to retain permanently or completely after deformation occurs as a result of an effective load All of the above The correct answer The ability of the material to retain permanently or completely after deformation occurs as a result of the effective load

Plasticity means: The property that indicates that the material does not crack or break after a change in it The ability of a material to retain permanently or completely after deformation occurs as a result of an effective load All of the above The correct answer The ability of the material to retain permanently or completely after deformation occurs as a result of the effective load

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter8: Engineering Materials

Section: Chapter Questions

Problem 8.5P: The frame of a space shuttle type vehicle must have a high yield strength and high stillness, and...

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Why are ceramics used in compression only? What are the kinds of bonds that exist in ceramics? Relate the identified bonds to possible properties generated by them in the ceramic.
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.
Given your understanding of what initiates and controls failure in materials, which of the following will increase the failure strength or lifetime of a test piece or component and why? a. Decreasing the difference between the maximum and minimum stress values, as this effects the stress concentration factor b. Decreasing the temperature below the brittle-ductile transition temperature, to make it harder C. Polishing to reduce surface defects Od. Increasing its volume, to give a larger cross sectional area Oe. Increasing the grain size so there are less grain boundaries to initiate failure
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Types of Solid materials
Axial deformation
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