Question

Define shearing strain.

Answer 1

when the deforming forces are such that there is a change in the shape of the body then the strain produced in the body is called shear strain.

actually, shearing strain is the ratio of relative displacement of any layer to its perpendicular displacement from fixed layer .

mathematically, $tan\theta=\frac{x}{h}$
for better understanding, see figure.

Answer 2

HEY DEAR ... ✌️

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=) When a body is acted upon by and external force tangential to a surface of the body , the opposite surface being kept fixed , it suffers a change in shape ; it's volume reamains
unchanged . Then , the body is said to be 'sheared' . The ratio of the displacement of a layer in the direction of the tangential force and the distance of that layer from the fixed surface is called the 'shearing strain' .

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