Calculation of Permanent set out of stress strain relation

[m.junaidjawaid]

Hi,
I have been given a relation between stress and strain which is
strain=(stress/70000)(1+(3stress/(1890))
the dia of round bar is 10mm and length is 3mm and that's all the data i have and I am required to find out permanent set.

 

[_coyote_]

How do i go about it?The permanent set can be determined by applying a certain amount of stress to the round bar and then measuring the change in length. The change in length can then be divided by the original length to calculate the strain. The strain can then be used to calculate the permanent set using the given equation.