In this paper, viscoplasticity is adopted as regularization technique to avoid the mesh sensitivity problem in strain localization simulation of multiphase geomaterials in quasi-static and isothermal conditions. Drucker-Prager yield surface with isotropic linear hardening/softening and non-associated plastic flow is used for simplicity. The regularizing effect of viscoplastic model is analyzed by numerical simulation of an undrained plane strain biaxial compression test on initially water saturated dense sand. Mesh sensitivity is examined by using different spatial discretization and the results denote the crucial influence of the loading velocity on the viscous regularization of quasi-static process.

Viscoplastic regularization of strain localization in fluid-saturated porous media

LAZARI, MARIA;SANAVIA, LORENZO;SCHREFLER, BERNHARD
2014

Abstract

In this paper, viscoplasticity is adopted as regularization technique to avoid the mesh sensitivity problem in strain localization simulation of multiphase geomaterials in quasi-static and isothermal conditions. Drucker-Prager yield surface with isotropic linear hardening/softening and non-associated plastic flow is used for simplicity. The regularizing effect of viscoplastic model is analyzed by numerical simulation of an undrained plane strain biaxial compression test on initially water saturated dense sand. Mesh sensitivity is examined by using different spatial discretization and the results denote the crucial influence of the loading velocity on the viscous regularization of quasi-static process.
2014
Proc. 11th World Congress on Computational Mechanics, WCCM 2014, 5th European Conference on Computational Mechanics, ECCM 2014 and 6th European Conference on Computational Fluid Dynamics, ECFD 2014
9788494284472
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3158224
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