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Strength of Materials by V. Ramasamy, P. Purushothama Raj

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1.9 ELASTIC CONSTANTS

Different types of stresses and their corresponding strains within elastic limit are related which are referred to as elastic constants. The three types of elastic constants are:

  1. Modulus of elasticity or Young’s modulus (E),
  2. Bulk modulus (K) and
  3. Modulus of rigidity or shear modulus (M, C or G).

1.9.1 Modulus of Elasticity or Young’s Modulus

Ratio of stress to strain within the elastic limit is a constant which is defined by Hooke as the Modulus of elasticity or Young’s modulus (E):

 

i.e., image
   
i.e., image

 

where ...

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