Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Textbook Question
Chapter 6.13, Problem 75SEP
Draw a generic engineering stress-strain diagram for a ductile metal and highlight the key strength points (yield, ultimate, and fracture strength) on the curve. (a) Schematically, show what happens if you load the specimen just below its yield point and then unload to zero. (b) Will the specimen behave differently if you load it again? Explain.
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(a) Draw two Engineering Stress - Engineering Strain graphs: one
for a ductile metal and one for a brittle metal, marking and
labelling on both graphs the Yield Stress, the Ultimate Tensile
Stress, the Fracture Stress, the region in which necking occurs.
Correctly label all graph axes and give correct units.
1. In the nominal stress-strain diagram (Figure 1), write down the names and meanings of points 1, 2, 3, and 4.2. Explain how to find the 0.2% offset yield strength, and explain the% elongation and% reduction in cross-sectional area.3. After explaining the difference between the true stress/strain and the nominal stress/strain, show the true stress-strain diagram for the nominal stress-strain diagram (Figure 1) to correspond points 1, 2, 3, and 4.
In a typical engineering stress-strain diagram, stress keeps on increasing after yield point due to strain hardening. In a few words or in a single short sentence explain what causes strain hardening?
Chapter 6 Solutions
Foundations of Materials Science and Engineering
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