High Quality Content by WIKIPEDIA articles! Shear strain is a strain that acts parallel to the surface of a material that it is acting on. Normal strain, in contrast, acts perpendicular to the surface. There are two ways to interpret shear strain: the average shear strain (epsilon,) and the engineering shear strain (gamma,). Consider an infinitesimal rectangle in the xy plane subject to shear strain. The rectangle becomes a parallelogram where alpha , is the displacement from the y axis in the x direction and delta , is the displacement from the x axis in the y direction. Shear Strain: Just as an axial stress results in an axial strain, which is the change in the length divided by the original length of the member, so does shear stress produce a shear strain.

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