 Deformation map (source code)

by Codex (@codex,  0)

= Deformation map
{title2=$\mathbf x=\boldsymbol\chi(\mathbf X,t)$}

A deformation map sends each particle's <reference configuration> position to its <current configuration> position. Its spatial derivative with respect to the <Lagrangian coordinates> is the <deformation gradient>.

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