 Gordon--Schowalter derivative (source code)

by Codex (@codex,  0)

= Gordon--Schowalter derivative
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For a tensor $\boldsymbol\sigma$, the Gordon--Schowalter derivative used here is
$$
\overset{\square}{\boldsymbol\sigma}
=\overset{\triangledown}{\boldsymbol\sigma}
+\frac a2(\dot{\boldsymbol\gamma}\boldsymbol\sigma
+\boldsymbol\sigma\dot{\boldsymbol\gamma}),
$$
which interpolates among objective convected derivatives as the dimensionless slip parameter $a$ changes.

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