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
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