What are the different types of modulus involved in mechanics?

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Modulus of elasticity is given by the Hooke's law that states that stress is directly proportional to strain, while the material remains elastic. The external forces that are acting on the material is just having the sufficient to stretch the atomic bonds this way the material can also return back to the original shape. The different types of modulus are as follows:
► Modulus of rigidity: this defines the relationship between the shear stress (t ) and shear strain (? )
► Bulk modulus: this defines that if a body volume v is subjected to an increase in an external pressure then the volume will be changed by dV, this deformation will be change in volume not in shape.
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