# What is Torsional Shear Stress?

Q.  Torsional Shear Stress is the stress induced when a component is subjected to equal and opposite _______.
- Published on 14 Sep 15

a. forces acting in perpendicular direction
b. couples acting in perpendicular direction
c. couples acting in parallel planes
d. forces acting in parallel direction

ANSWER: couples acting in parallel planes

#### Discussion

• Sravanthi   -Posted on 30 Oct 15
The different types of stresses induced in mechanical components are:

1) Tensile stress
2) Compressive stress
3) Torsional shear stress
4) Bearing pressure
5) Direct shear stress
6) Bending stress

Torsional shear stress:

- The stress induced in a mechanical component is called as torsional shear stress, if it is subjected to action of two equal and opposite couples acting in parallel planes.

- Torsional shear stress is maximum at outer surface and zero at centroidal axis.

- Torsional shear stress (τ) = Tr / J

here, T = torque applied, r = radial distance from centroidal axis, J = Polar moment of inertia

- It is measured in N / mm2

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