Download package of ISA cyclic hypoplasticity model. Contains umats and example Abaqus input files. Umats (ISA+sand hypoplasticity) allow to switch between ISA and classical intergranular strain concept.
Software
Download Package of Matlab Driver

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Simple Matlab element test driver running elasto-plastic and hypoplastic models. Programmed in 2012 by Claudio Tamagnini and David Mašín for the ALERT Olek Zienkiewicz Course.
SANISAND for FLAC3D Download

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112
Download link for FLAC3D implementation of SANISAND model.
PM4Sand for Plaxis Download

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107
Download link to Plaxis PM4Sand dll
Download link for additional references, software manuals and simulation codes of PM4Silt model maintained by the model developers from University of California at Davis.
PM4Sand FLAC Download and documentation

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125
Download link for additional references, software manuals and simulation codes of PM4Sand model maintained by the model developers from University of California at Davis.
Package contains Plaxis UDSM (dll files only), package documentation in pdf and related journal publication and PhD thesis pdf files. Authors are
researchers from the Graz University of Technology.
Download package of sand and clay hypoplasticity for GeoSlope SIGMA/W finite element code. Based on umat, comes along with the source code.
Download package of barodesy – ABAQUS umat (source code) and Plaxis dll

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377
Download package of barodesy model. Contains ABAQUS umat (source code), Plaxis UDSM (dll files only, not source code), package documentation, related journal publications, Abaqus and Plaxis examples.
Download Package of Triax Element Test Driver

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273
Download package of Triax element test sofware by D. Mašín and co-workers.
Download package contains two umats, one for basic hypoplasticity (von Wolffersdorff, 1996) and the other for hypoplasticity with small strain stiffness (Niemunis and Herle, 1997).
Interface between umat (Abaqus/Standard) and vumat (Abaqus/Explicit) user defined model standards by Bienen et al. (2014).
Download Package of Incremental Driver

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Download package of a Incremental Driver single element program by Niemunis (2007, 2014) for running element tests using constitutive models implemented in umat format.
SANISAND Abaqus UMAT and Plaxis implementations

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814
UMAT and Plaxis implementations of SANISAND constitutive model by Dafalias and Manzari (2004).
Download Package for Hypoplastic interface model and UMAT – FRIC interface

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309
Download Package of frictional interface model by Stutz et al. (2016, 2017) for granular soils based on Hypoplasticity including interface between UMAT and FRIC ABAQUS standards.
Clay and Sand hypoplasticity UMAT and Plaxis implementations, including UMAT-Plaxis interface

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743
Download package of Clay and Sand hypoplasticity UMAT and Plaxis implementations, including pre-compiled UMAT-Plaxis interface.
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