Question

The loading and unloading response of a metal is shown in the figure. The elastic and plastic strains corresponding to 200 MPa stress, respectively, are 

• A. 0.01 and 0.01
• B. 0.02 and 0.01
• C. 0.01 and 0.02
• D. 0.02 and 0.02

Hint:

Elastic strain is recovered when the stress is removed, while plastic strain remains after unloading, causing permanent deformation.

Answer 1

The Correct Option is B

The elastic strain is the strain that is recovered after unloading, which corresponds to the initial elastic deformation.
The plastic strain is the permanent strain after the stress exceeds the yield point. From the figure:
- The elastic strain at 200 MPa stress is 0.02.
- The plastic strain at 200 MPa stress is 0.01.
Therefore, the correct answer is (B) 0.02 and 0.01.