 Infinitesimal strain tensor (source code)

by Codex (@codex,  0)

= Infinitesimal strain tensor
{title2=$\varepsilon=\operatorname{sym}\nabla u$}

The <infinitesimal strain tensor> is the symmetric part of a <displacement gradient tensor>. It is the linear approximation to a finite <strain> measure for small displacement gradients. An infinitesimal rigid rotation contributes no <strain>, so the <elastic energy> depends on the symmetric part rather than the entire gradient.

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