This model is intended for the adaptation and recalculation of material tests under triaxial conditions. The default setting is a material with a modified hardening soil material model and test conditions according to Bower et al. (Bower T.A., Jefferson A.D., & Cleall P.J. (2020). A reformulated hardening soil model. Proceedings of the Institution of Civil Engineers – Engineering and Computational Mechanics 173(1): 11–29. https://doi.org/10.1680/jencm.18.00054 ). In addition to axial strain, axial elongation related to two further isotropic initial stress states was also considered here.