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Neenu
February 14, 2020

Stress and strain are two important parameters associated with a body that is subjected to an external force.

###
Strength of Material

When a body is subjected to some external force, it undergoes some form of deformation. The resistance of the body to prevent such deformation forms the **strength of the material.**

###
What is Stress?

The force of resistance per unit area of the body is called stress. It is measured as the ratio of force and the area of the cross-section. The external force acting on the body is termed as**load (P). **If the area of cross-section is (A), then stress is given by,

**Ïƒ = P/A**
###
Unit of Stress

###
What is a Strain?

**Îµ = âˆ†l/l**

These are of 4 Types:
####
1. Tensile Strain

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2. Compressive Strain

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3. Volumetric Strain

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4. Shear Strain

The force of resistance per unit area of the body is called stress. It is measured as the ratio of force and the area of the cross-section. The external force acting on the body is termed as

The unit of stress is N/m2 or kgf/m2 or kgf/cm2.

The S.I Unit is N/m2. Where, 1N/m2 = 1 PascalÂ

The ratio of change in dimension of the body to its original dimension is called strain. The strain is a unitless quantity. Which is given by the relation,

âˆ†l = Change in Dimension

lÂ Â = Original Dimension

These are of 4 Types:

- Tensile Strain
- Compressive Strain
- Volumetric Strain
- Shear Strain

This is the ratio of change in length of the body to its original length due to the deformation caused by a pulling force or tensile force.

e = dl/l

e = dl/l

This is the ratio of change in dimension of the body to the original dimension due to the deformation caused by a pushing force or compressive force.

e = -dl/l

e = -dl/l

This is the ratio of change in the volume of the body to its original volume.

e = dV/V

e = dV/V

This is the strain produced due to shear stress.

Shear Strain =Â Î¦= dx/h

Shear Strain =Â Î¦= dx/h

Body Under Shear Stress Fp |

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