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A torsion test determines the shear modulus of a material by measuring

  • A.The twist under a known torque
  • B.The load at fracture
  • C.The extension under axial load
  • D.The hardness of the surface

Answer: A

Rearranging the twist expression gives the shear modulus directly from the measured angle, the applied torque, the gauge length and the section's torsion constant. A circular specimen is used so that the torsion constant is known exactly.

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