Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 6.13, Problem 76SEP
(a) Draw a generic engineering stress-strain diagram for a ductile metal and high-light the key strength points (yield, ultimate, and fracture strength) on the curve. Schematically, show what happens if you load the specimen just below its ultimate tensile strength point and then unload to zero, (b) Will the specimen behave differently if you load it again? Explain.
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Students have asked these similar questions
Briefly comment on the values obtained for the Elastic Modulus, Yield Strength,
Ultimate Strength and Toughness of the test specimen as compared to values of various
comparable materials found in the literature. Is the test material comparatively strong? Is
it stiff? Is it tough?
Yield strength is 186Mpa, elastic modulus is 44.8GPa
And the ultimate strength is 238.7mpa
If material A is observed to have twice the modulus of rigidity but the same Poisson's ratio and yield shear stress than that of material B, then which of
the following comparisons is always true?
Select one:
Material A can resist higher normal stresses than material B can before permanent normal deformations occur.
O b
For the same load that brings the materials to plastic behavior, material A will experience larger permanent shear deformations than material B.
Material A can resist higher shear stresses than material B before permanent shear deformations occur.
O d. Material B is has a lower ultimate stress than material A.
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.
Chapter 6 Solutions
Foundations of Materials Science and Engineering
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- For a brass alloy, the stress at which plastic deformation begins is 345 MPa, and the modulus of elasticity is 103 GPa. Determine the following (a) What is the maximum load that may be applied to a specimen with a cross: sectional area of 130 mm2 without plastic deformation?(b) If the original specimen erngth is 76 mm, what is the maximum length to which it may be stretched without causing plastic deformation?arrow_forwardQUESTION ONE (a) Distinguish between physical and mechanical properties of materials. Give two examples of each. (b) Explain why in a stress versus strain curve, the plastic portion of the graph after necking tends to drop (ie the force drops) despite that the tension is increasing. (c) A tensile test uses a copper test specimen that has a gauge length of 80 mm and a di.ameter of 16 mm. During the test, the specimen yields under a load of 9,600 N. The corresponding gauge length is 80.24 mm. The maximum load reached is 148,000 N at a gauge length of 94.2 mm, while fracture happens at a load of 12,800 N and a gauge length of 102 6 mm Determine the following: (i) Modulus of elasticity E (ii) Yield strength Oy (iii) Fracture strength, ơt (iv) Tensile strength OTs. 1arrow_forward1. What are the elastic modulus (E) and the Poisson's ratio () used to indicate? 2. Illustrate the differences between actual stress and engineered stress with strain, and also describe their underlying physical concepts. 3. If the engineering strain is 2% for a specific state of uniaxial stress, what is the real strain? Please solve for all in full detail and step by steparrow_forward
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