Hypoplastic interface model and UMAT – FRIC interface
Frictional interface model by Stutz et al. (2016, 2017) for granular soils based on Hypoplasticity using the hypoplastic UMAT Implementation.
Stutz, H., Mašín, D., Sattari, A. and Wuttke, F. (2017). A general approach to model interfaces using existing soil constitutive models – application to hypoplasticity. Computers and Geotechnics , Volume 87, July 2017, Pages 115-127 (doi: 10.1016/j.compgeo.2017.02.010). [Preprint PDF]