For details of material models available at this web site in the form of finite element implementation, the interested readers are referred to the journal publications. The following literature sources are relevant:
Sand hypoplasticity model:
Model formulation is described in von Wolffersdorff (1996) [9]. For details of model calibration procedure, see Herle and Gudehus (1999) [2]. Small strain stiffness formulation (so-called intergranular strain concept) is described in Niemunis and Herle (1997) [8].
Clay hypoplasticity model:
The implemented model has been published by Mašín (2013) [6]. This model is an anisotropic version of the general clay hypoplasticity model described thoroughly in Mašín [5]. Structure of the anisotropic stiffness matrix described in Mašín and Rott [7]. Structured-soil specific model features are described in Mašín (2007) [4]. The model can be used with the intergranular strain concept, its original formulation is in Niemunis and Herle (1997) [8], enhanced formulation implemented is in Mašín (2013) [6]. Most of the cited journal papers available here
for free download in the form of PDF preprints.
Further details on calibration of material parameters of hypoplastic models can be found here.
