The stress state at a point in a body is plane with $\sigma _{1}$ =60 N/mm2 and $\sigma _{2}$ = –36 N/mm2.
If the allowable stress for the material in simple tension or compression is 100 N/mm2. Calculate the values of factor of safety with each of the following criteria for failure
(i) Max Stress Criteria
(ii) Max Shear Stress Criteria
(iii) Max Strain Criteria
(iv) Max Distortion energy criteria