The principal stresses at a point P in a solid are 70 MPa, −70 MPa and 0. The yield stress of the material is 100 MPa. Which prediction(s) about material failure at P is/are CORRECT?

Options :

1. Maximum normal stress theory predicts that the material fails

2. Maximum shear stress theory predicts that the material fails

3. Maximum normal stress theory predicts that the material does not fail

4. Maximum shear stress theory predicts that the material does not fail