Question

For a plane stress condition, the major principal stress is 140 MPa and minor principal stress is $\sigma$. The shear stress on a plane inclined at ${45}^{\circ }$ to the principal plane is 60 MPa, the value of $\sigma$ (in MPa, correct upto nearest integer )is_____.

• A. 20

Answer 1

The correct option is A 20
Maximum shear stress, ${\tau }_{max}=60MPa$
$\frac{140-\sigma }{2}=60$
$\sigma =20MPa$