Mechanics

Difference between young's modulus, bulk modulus and shear modulus

The basic difference between young’s modulus, bulk modulus, and shear modulus is that Young’s modulus is the ratio of tensile stress to tensile strain, the bulk modulus is the ratio of volumetric stress to volumetric strain and shear modulus is the ratio of shear stress to shear strain.

Young’s modulus

The ratio of tensile stress to tensile strain is called young’s modulus.

Young’s modulus formula

young's modulus formula

See also: Difference between stress and strain

Bulk modulus

For three dimensional deformation, when the volume is involved, then the ratio of applied stress to volumetric strain is called Bulk modulus. Mathematically it is expressed as:

Bulk modulus formula

bulk modulus formula

Where ΔV is the change in original volume V.

Shear modulus

The ratio of shear stress and shear strain is called shear modulus. Mathematically it is expressed as:

Shear modulus formula

shear modulus formula

Elastic constants for some of the materials are given in the table:

MaterialYoung’s modulus
109Nm-2
Bulk modulus
109Nm-2
Shear modulus
109Nm-2
Aluminum707030
Bone1580
Copper11014044
Diamond1120 540 450
 Glass 553123
Steel20016084
Tungsten390200150
Water02.20
Lead157.75.6

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