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Clay and Sand hypoplasticity UMAT and Plaxis implementations, including UMAT-Plaxis interface
Description: Interface between umat and Plaxis (UsrMod) user defined model standards. Includes clay and sand hypoplastic model implementations, including the intergranular strain concept versions of the model. Description of the implementation and a user manual can be found here.
The implemented sand model has been published by von Wolffersdorff (1996). The implementation also contains Niemunis and Herle (1997) extension for predicting small strain stiffness effects.
The implemented clay model has been published by Mašín (2014). This model is an anisotropic version of the general clay hypoplasticity model described thoroughly in Mašín (2013). Structure of the anisotropic stiffness matrix described in Mašín and Rott (2014). Structured-soil specific model features are described in Mašín (2007). The model can be used with the intergranular strain concept, its original formulation is in Niemunis and Herle (1997), enhanced formulation implemented is described in Mašín (2013). Most of the cited journal papers available here for free download in the form of PDF preprints.
Interface implementation between umat user defined constitutive model format of Abaqus and User_Mod format of Plaxis finite element code. Comes pre-compiled along with clay and sand hypoplastic model implementations, can be used as a base for implementation of other constitutive models.
Authors: The original umat implementation has been developed by Claudio Tamagnini in 2005. It has since been further developed and updated to new models by David Mašín. The original interface implementation has been developed by prof. P. A. von Wolffersdorff in 2005. It has since been further developed and updated by David Mašín.
Related publications (clay hypoplasticity):
Related publications (sand hypoplasticity):