Ratio of shear stress and shear strain is called ________

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ISRO VSSC Technician-B (Fitter) Official Paper (Held On: 14 July 2021)
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  1. Modulus of rigidity 
  2. Poisson's ratio
  3. Elasticity coefficient
  4. Safety Coefficient

Answer (Detailed Solution Below)

Option 1 : Modulus of rigidity 
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Explanation:

Modulus of rigidity:

  • Shear modulus or modulus of rigidity is used to measure the rigidity of a body.
  • The ratio of shear stress over shear strain is known as Shear modulus.
  • It is denoted by G.
  • The SI unit of rigidity modulus is Pascal (Pa).
  • Shear stress is the force that causes the deformation of material along a plane that is parallel to applied shear stress.
  • Shearing is the act of removing material from the surface of a body by applying stress.
  • Shear stress occurs when the force is applied parallel to a surface.

Poisson’s ratio:

  • Poisson’s ratio is the ratio of transverse contraction strain to longitudinal extension strain in the direction of the stretching force.

Elastic coefficient:

  • Modulus of elasticity or the coefficient of elasticity or Elastic constant is defined as the ratio of stress to strain.
  • The SI unit of the elastic constant is N/m2.
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