I want to model brittle material (ice) with elliptical failure criterion (figure below), which is both temperature and strain rate dependent.
For current step I don't need any material yielding / plastic deformations. I want to model the material with orthotropic elastisicty and failure according to criterion in Fig. below.
If it is possible with SPG and UMAT it would be great.
- Or may be I can modify some special parameter in UMAT that will address creterion in MAT_ADD_EROSION when failure criterion is met? Therefore bond failure will occure because some MAT_ADD_EROSION criterion is met, but this quantity will be met because of some parameter inside UMAT
- Or can I set this failure criterion as yield criterion (yield surface) and use very small critical value for effective plastic strain (IDAM=1) to model material failure in this way?