Is annealed polycrystalline copper a material that work hardens significantly
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Is annealed polycrystalline copper a material that work hardens significantly

The engineering stress-strain curve for annealed polycrystalline Cu is shown below.


a. Is annealed polycrystalline copper a material that work hardens significantly or a material that exhibits a low work-hardening rate? Explain your answer.

b. Suppose this Cu were loaded to a stress of 150 MN/m2, and then the load were removed. How much strain would be recovered on unloading? (For Cu, E = 11.1 X 1010 N/m2.)

c. Suppose the unloaded sample were left on a table in the laboratory. A student comes into the laboratory and measures the yield strength of this material. What would the student quote for the value of this yield strength?

Hint
Engineering" The stress-strain curve of the material gives the relationship between stress and strain. It is obtained by gradually applying a load to the specimen and measuring the strain, from which stress and strain can be determined. These curves reveal many properties of the material, such as Young's modulus  and maximum tensile strength."...

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