5.3.2 Perzyna

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5.3.2 Perzyna

The Perzyna viscoplasticity models can only be combined with Von Mises plasticity [§17.3.1].

(syntax)

$\begin{figure}\centering \begin{tabbing} \texttt{'MATERI'} \\ [-1.0ex] \rule{14... ...extit{gamma}}$_{r}\,$ \texttt{\textit{n}}$_{r}\,$ \end{tabbing} \end{figure}$

VISCOP

specifies the criterion to be used:

PERZY1 for the first Perzyna model:

$\displaystyle \dot{{\boldsymbol{\varepsilon}}}^{{\mathrm{vp}}}_{}$ = $\displaystyle \gamma$ < $\displaystyle \phi$ (f ) > m with $\displaystyle \phi$ (f )= $\displaystyle \left(\vphantom{ \frac{f}{\bar\sigma _{0}} }\right.$ $\displaystyle {\frac{{f}}{{\bar\sigma _{0}}}}$ $\displaystyle \left.\vphantom{ \frac{f}{\bar\sigma _{0}} }\right)$ ^N

(5.24)

PERZY2 for the second Perzyna model:

$\displaystyle \dot{{\boldsymbol{\varepsilon}}}^{{\mathrm{vp}}}_{}$ = $\displaystyle \gamma$ < $\displaystyle \phi$ (f ) > m with $\displaystyle \phi$ (f )= $\displaystyle \left(\vphantom{ \frac{f}{\bar\sigma } }\right.$ $\displaystyle {\frac{{f}}{{\bar\sigma }}}$ $\displaystyle \left.\vphantom{ \frac{f}{\bar\sigma } }\right)$ ^N

(5.25)

VPLVAL

gamma is the fluidity parameter $\gamma$ and n is the power N .

DIANA-9.3 User's Manual - Material Library
First ed.

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