Antiplane shear refers to a specific type of shear deformation in a material where the displacement occurs perpendicular to the plane of interest. In this context, "antiplane" indicates that the shear strain is considered in a direction that is perpendicular to the principal plane of stress or definition of the problem. In three-dimensional elasticity, problems can often be simplified by focusing on one specific type of deformation.
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Antiplane shear has displacement normal to a plane and independent of that normal coordinate. In an isotropic linear elastic body, and , together with their symmetric partners, are the only nonzero stress tensor entries. Static balance without body force reduces to the Laplace equation for .