Unreasonable contact force in cutting simulation
(1) I am modeling a disc cutter (FEM) cutting rock block (SPH), and the interaction between rock and cutter is defined with *CONTACT_AUTOMATIC_NODES_TO_SURFACE, fs=fd=0.3. The expected rolling force (contact force in the Y direction) should be always positive or negative (depends on it from slave or master). However, my results show that the Y force fluctuates around zero. Could you give me some suggestions?
(2) Rock block consists of SPH part and FEM part, why there is a gap bewteen SPH and FEM in post-processing? It seems that some particles disappeared. Their interaction is defined by *CONTACT_TIED_NODES_TO_SURFACE.