High Quality Content by WIKIPEDIA articles! The patch test in the finite element method is a simple indicator of the quality of a finite element, developed by Bruce Irons. The patch test uses a partial differential equation on a domain consisting from several elements set up so that the exact solution is known. Typically, in mechanics, the prescribed exact solution consists of displacements that vary as linear functions in space (called a constant strain solution). The elements pass the patch test if the finite element solution is the same as the exact solution.

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