Discussion
Torsional rigidity is the product of
Answer: A
Correct answer: The shear modulus and the torsion constant
Torsional rigidity is \( GJ \), where \( G \) is the shear modulus and \( J \) the torsion constant of the section. It plays exactly the role that \( EI \) plays in bending: the material property multiplied by a purely geometric one. Young’s modulus does not appear, because torsion loads the material in shear rather than in direct stress.
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