Question

What is torsional stress?

Answer 1

1. Torsional stress is the stress that apply on a transverse cross section that is caused by action of twist.
2. When a force is applied parallel or tangent to an area, shear stress (caused by torsional load) occurs. There are two types of shear stress: direct shear stress and torsional shear stress.
3. The formula of the torsional stress is $t_{max}=(TR/J)$ , where R is the shaft radius and J is the polar moment of inertia of the shaft.
4. The units of torsion in either $Pascal\left(Pa\right)$ or in $poundspersquareinch\left(psi\right)$.
5. The angle of twist is $\phi =TL/JG$. Where $T$ is the torque applied, $L$ is the length, $J$ is the polar moment of inertia and $G$ is the modulus of rigidity
6. The modulus of rigidity is equal to the slope of the line.