In materials science, modulus of rigidity or shear modulus is defined as the ratio of shear stress to the shear strain. The rigidity modulus is one of several quantities for measuring the strength of materials. All of them arise in the generalized Hooke's law:
Young's modulus describes the material's response to linear strain (like pulling on the ends of a wire),
The bulk modulus describes the material's response to uniform pressure.
This modulus is concerned with the deformation of a solid when it experiences a force parallel to one of its surfaces while its opposite face experiences an opposing force (such as friction).
Description:
The apparatus consists of a rod clamped at one end and attached to a wheel at the other. The rod passes through a bearing at the wheel end and known torques may be applied by a string wrapped around the wheel. The twist in the rod is measured with an angular scale.
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