materi_plasti_hypo_history number_of_history_variables

The history variables for the hypo-plasticity models are added to the node_dof records. You need to set number_of_hypo_history_variables to at least to 4, or for the group_materi_plasti_masin model i.c.w. group_materi_plasti_masin_structure to at least to 5.

The first history variable contains the void ratio, and should be initialized by initially specifying node_dof records. The second history variable will be filled with the mobilized friction angle; this is meant for postprocessing only. The third history variable will be filled with the a measure of the effective stiffness following from the hypoplasticity law ( $\sqrt{ M_{ijkl} M_{ijkl} }$ ); this is meant for postprocessing only. The fourth history variable will be filled with the minimum sub step size of the internal substepping algorithm for hypoplasticity; this is meant for postprocessing only. The fifth history variable, for the masin law, will be filled with the structure variable $s$, and should be initialized by initially specifying node_dof records. The sixth history variable, will be filled with the $OCR$ value, and is only meant for printing and plotting, thus should not be initialized by initially specifying node_dof records (you need to set number_of_history_variables at least to 6).