Question

In τ12 first subscript denotes the where τ denotes the shear stress acting on a body

Answer 1

Solution: In the shear stress components, the single subscript notation is actually not practical.

This is because this type of stress is in direction which is parallel to the surface to which the stress acts.

It is thus important to specify two directions which is normal to the surface and the stress itself.

Answer 2

In τ12 first subscript denotes the where τ denotes the shear stress acting on a body... Then..