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ISIF=0»òÕß2ÊǵIJî±ðÔÚºóÕß»ácalculate stress tensor.
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           IF (SQRT(TIFOR(1,NI)**2+TIFOR(2,NI)**2+TIFOR(3,NI)**2) &
                &       >ABS(DYN%EDIFFG)) LSTOP2=.FALSE.

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