Parallel Algorithms for Coupled Bem-Fem with Elastoplastic Deformations in the Fe-Domain
1997
The classical linear elastoplastic model with the von Mises yield criterion and an associative flow rule, postulating
$${\varepsilon ^e} = \varepsilon - {\varepsilon ^p}$$
yields
$$\psi (\varepsilon - {\varepsilon ^p}) = {1 \over 2}(\varepsilon - {\varepsilon ^p}):{C^e}:(\varepsilon - {\varepsilon ^p})$$
with the total (geometrical) strain e and the plastic strain e p , see e.g. Lubliner, 1990. The stresses follow as
$$\sigma = {\partial _\varepsilon }\psi (\varepsilon - {\varepsilon ^p}) = {C^e}:(\varepsilon - {\varepsilon ^p})$$
The associated flow rule with isotropic hardening is described by
$${\dot \varepsilon ^p} = \lambda {\partial _\sigma }\Phi (\sigma ,\alpha )with\Phi (\sigma ,\alpha ) = \left\| {dev\sigma } \right\| - {2 \over 3}({y_0} + H\alpha )$$
where H, y 0 are material constants, and α is an internal variable. The loading-unloading conditions can be expressed in the Kuhn-Tucker form as
$$\lambda \ge 0,\Phi (\sigma ,\alpha ) \le 0,\lambda \Phi (\sigma ,\alpha ) = 0$$
The solution of the coupled elastoplastic problem is obtained by a standard return mapping algorithm (Simo and Taylor, 1986).
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