Contributions to Proceedings:
G. Meschke, C.H. Liu:
"The Cam-Clay Model at Finite Strains: Algorithmic Aspects and Finite Element Analysis of Snow";
in: "Proceedings of the 8th International Conference of the International Association for Computer Methods and Advances in Geomecahnics",
The classical (modified) Cam-Clay model is recast within an algorithmic framework for finite strain plasticity proposed recently by Simo (1992) and Simo & Meschke (1993). The yield function is reformulated in a convex format. A fully implicit treatment of the nonlinear elastic constitutive law along with an implicit integration of the flow rule on the basis of the return map algorithm is presented. From the exact linearization of the algorithm, the elastoplastic algorithmic tangent moduli are obtained in a nonstandard format. An alternative semi-explicit integration scheme which retains the implicit character of the return map while adopting an explicit integration of the hardening law is proposed as an alternative approach that improves the convergence behaviour in symmetric FE-codes. The effectiveness of the approach is demonstrated by means of re-analysis of a shear box test of snow specimen.
Keywords: fem, plasticity, snow, , elasticity, finite strains, Cam-Clay, Finite Element Analyses
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