The term deformation per unit length is referred for ______

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KPSC JE 2016: Specific Paper

Option 3 : Strain

ST 1: Building Materials

1159

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__Strain:__

It is defined as the ratio of change in dimension to the original dimension of a body after the deformation of the body.

It is a dimensionless quantity since the ratio is between two quantities of the same dimension.

Linear strain

For any deformed body, it is defined as the ratio of the change in length of the body due to the deformation to its original length in the direction of the force.

If l is the original length and dl the change in length occurred due to the deformation, the linear strain e induced is given by e=dl/l.

Lateral strain

For any deformed body, it is defined as the ratio of the change in length (breadth of a rectangular bar or diameter of a circular bar) of the body due to the deformation to its original length (breadth of a rectangular bar or diameter of a circular bar) in the direction perpendicular to the force.