OGS
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A class for computing the BGRa creep model, which reads.
\dot {\mathbf{\epsilon}}^{cr}=\sqrt{\frac{3}{2}}A \mathrm{e}^{-\frac{Q}{RT}} \left(\frac{\sigma_{eff}}{\sigma_0}\right)^n\frac{\mathbf{s}}{||\mathbf{s}||}
where \sigma_{eff}=\sqrt{\frac{3}{2}}||\mathbf{s}||, A, \sigma_0, n, Q are parameter, and R is the gas constant.
No additional info.
Used in no end-to-end test cases.