5.3.1 Duvaut-Lions

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5.3.1 Duvaut-Lions

The Duvaut-Lions viscoplasticity model may be combined with all plasticity models [§17.3.2].

(syntax)

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

VISCOP: DUVAUT specifies that the Duvaut-Lions criterion must be used.
VPLVAL: eta is factor $\eta$ from $\dot{{\boldsymbol{\varepsilon}}}^{{\mathrm{vp}}}_{}$ = ${\dfrac{{1}}{{\eta}}}$ D_e^-1 $\left(\vphantom{ \boldsymbol{\sigma}- \boldsymbol{\sigma}_{\mathrm{p}} }\right.$ $\boldsymbol\sigma$ - $\boldsymbol\sigma$ _p $\left.\vphantom{ \boldsymbol{\sigma}- \boldsymbol{\sigma}_{\mathrm{p}} }\right)$ .

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

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