A Modified Drucker-Prager Criterion for Transversely Isotropic Geomaterials and its Numerical Implementation

Abstract:

A failure criteria basing on Drucker-Prager yield criterion for geomaterials is modified in terms of the inherent anisotropy of the friction angle and the dilation angle. To implement the model in a numerical way, the corresponding consistent return mapping algorithm is formulated and by dividing the scalar product of the stress rate and the strain rate into the deviatoric and spherical parts, the consistent elastoplastic tangent modulus matrix is obtained. Then, the codes are introduced into finite element software ABAQUS via the UMAT. An example has been presented illustrating influence of the anisotropic degree on the bearing capacity and the pattern of strain localization.

• Periodical: Advanced Materials Research (Volumes 850-851)
• Pages: 115-119
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.850-851.115
• Online since: December 2013
• Authors: Wei Yu Wu, Guo Hua Liu*
• Keywords: Consistent Algorithm, Failure Criterion, Geomaterials, Strain Localization, Transversely Isotropy, UMAT

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