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Shear strain is a strain that acts parallel to the face of a material that it is acting on. Normal strain acts perpendicular to the face of that it is acting on. There are two ways to interpret shear strain: the average shear strain and the engineering shear strain. The variable used to denote average shear strain is ε while γ denotes engineering shear strain.
Additional recommended knowledge
Consider an infinitesimal rectangle in the xy plane subject to shear strain. The rectangle becomes a parallelogram where α is the displacement from the y axis in the x direction and δ is the displacement from the x axis in the y direction. The average shear strain is
Definition of engineering shear strain:
θ is the angle before deformation and β is the angle at that same point after deformation. Therefore γ describes the total deformation. Although, strain is dimensionless, it is usually stated as in./in. or some similar sign convention.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Shear_strain". A list of authors is available in Wikipedia.|