Engineering Mechanics

Proceedings Vol. 14 (2008)

ENGINEERING MECHANICS 2008

Copyright © 2008 Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague

 

Janda T., Šejnoha M.
pages 102 - +2p., full text

Elasto-plastic material models based on the concept of critical state represent a useful tool for simulating the behavior of soil bodies when implemented in finite element method. The idea of the soil description which predicts either hardening or softening in dependence on the actual porosity was first formulated by Hvorslev (1937) and further developed by Roscoe & Burland (1968) who introduced the modified Cam clay model. The ability of the model to soften, i.e. to decrease stress with increasing deformation, requires additional modification of the standard FEM algorithms when analyzing the post failure response. First, the Newton- Raphson solver of the global system of equilibrium equations has to be replaced with an algorithm enabling to decrease the applied load such as the arc-length method. Second, the mesh dependent strain localization has to be regularized by introducing the internal length of the material which indirectly controls the width of the shear bands.

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