Recently, there was a request to ouput the principal stresses for each element at lower and upper surfaces of each shell element in DYNAIN file to use in some failure theories. I beleive this feature is a routine output in PamStamp simulations. To enable this, the attached ‘C’ code can be used that reads in a DYNAIN file (valid output from LS-DYNA) to use the stress-tensor and output the principal stresses for each element at lower and upper surfaces.
