Strength of Materials

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.,
i.e.,

 

where ...