Torsional rigidity

Question

What do you understand by the term “torsional rigidity of a shaft”?Prove that the

torsional rigidity is the torque required to produce a twist of one radian in a unit length of the shaft.

Answer 1

The term "torsional rigidity of a shaft" refers to the resistance of the shaft to undergo torsional deformation or twisting when subjected to a torsional moment or torque. It quantifies the ability of a shaft to transmit torque without excessive angular deformation.