24

Figure 9. Flow chart of a FE analysis using the user-defined material USRMAT184 subroutine with

the commercial software PAM-STAMP.

CALL USRMAT184_INP Read input from material cards or GUI

NCYCLE = 0

CALL USRMAT184_PRN Print the material ID in the list of material models

CALL USRMAT184_INI Initialize the array of material properties

TT = Termination time

CALL USRMAT184_SLV or IMP_USRMAT184_SLV Update stress, plastic strain and history variables (auxiliaries) of the (n+1)th cycle. INPUT: Stress tensor , , ,p p p pn n slip twin untwin Strain increment tensor History variables STRS at the end of the nth cycle OUTPUT: 1 1 1, , , ,p p p p pn n n slip twin untwin Auxiliaries STRS

CALL USRMAT184_OUT Write auxiliaries to history output DSY file

NCYCLE: current cycle number

TT: current time

Post processing

Pre-processing

YES

NO

NO

YES