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Incremental strains are the increments of distortion that affect a body
during deformation. Finite strain represents the total strain experienced
by a rock body. It is the summation of all of the incremental components.
If the increments of strain are a constant volume process, the overall
mechanism of distortion is termed plane strain. Pure shear and simple
shear are two end members of plane strain (Davis and Reynolds, 1996).
Below, algorithms for calculating displacements of points during simple
and pure shear are developed.
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