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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,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

## Bulk modulus

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

### 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

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

Material | Young’s modulus 10 | Bulk modulus 10 | Shear modulus 10 |

Aluminium | 70 | 70 | 30 |

Bone | 15 | – | 80 |

Copper | 110 | 140 | 44 |

Diamond | 1120 | 540 | 450 |

Glass | 55 | 31 | 23 |

Steel | 200 | 160 | 84 |

Tungsten | 390 | 200 | 150 |

Water | 0 | 2.2 | 0 |

Lead | 15 | 7.7 | 5.6 |