Mohr's cicle for the state of stress defined by $$\left[ {\matrix{ {30} & 0 \cr 0 & {30} \cr } } \right]$$ $$MPa$$ is a circle with

The symmetry of stress tensor at a point in the body under equilibrium is obtained from

The components of strain tensor at a point in the plane strain case can be obtained by measuring longitudinal strain in following directions.

A small element at the critical section of component is in a state of stress with the two principal stresses being $$360$$ $$MPa$$ and $$140$$ $$MPa$$ . The maximum shear stress is