LOADING
Question
The stress at which extension of a material takes place more quickly as compared to the increase in load is called :
A.
elastic point
B.
plastic point
C.
breaking point
D.
yielding point 
Answer ( Option D)

yielding point 

Solution

On a stress-strain curve, the yield point is the stress level at which the material begins to deform plastically — beyond this point, a large increase in strain (extension) occurs for a very small (or negligible) increase in stress (load).

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