发布时间 : 星期五 文章黄永刚单晶塑性有限元umat子程序更新完毕开始阅读
IJ2=I+J-2
IF (MOD(IJ2,2).EQ.1) THEN TERM1=1. ELSE
TERM1=-1. END IF
DVGRAD(I,J)=DVGRAD(I,J)+TERM1*DSPIN(IJ2) DVGRAD(J,I)=DVGRAD(J,I)-TERM1*DSPIN(IJ2)
DO K=1,NSLPTL
DVGRAD(I,J)=DVGRAD(I,J)-TERM1*DGAMMA(K)* 2 SLPSPN(IJ2,K)
DVGRAD(J,I)=DVGRAD(J,I)+TERM1*DGAMMA(K)* 2 SLPSPN(IJ2,K) END DO END IF
END DO END DO
END IF
C----- Increment of resolved shear stress in a slip system: DTAUSP DO I=1,NSLPTL DTAUSP(I)=0. DO J=1,6
DTAUSP(I)=DTAUSP(I)+DDEMSD(J,I)*DELATS(J) END DO END DO
C----- Update the resolved shear stress in a slip system: C STATEV(2*NSLPTL+1) - STATEV(3*NSLPTL) C
DO I=1,NSLPTL
STATEV(2*NSLPTL+I)=STATEV(2*NSLPTL+I)+DTAUSP(I)-DTAUOD(I) END DO
C----- Increment of stress: DSTRES IF (NLGEOM.EQ.0) THEN DO I=1,NTENS DSTRES(I)=0. END DO ELSE
DO I=1,NTENS
DSTRES(I)=-STRESS(I)*DEV END DO END IF
DO I=1,NDI DO J=1,NDI
DSTRES(I)=DSTRES(I)+D(I,J)*DSTRAN(J) END DO
IF (NSHR.GT.0) THEN DO J=1,NSHR
DSTRES(I)=DSTRES(I)+D(I,J+3)*DSTRAN(J+NDI) END DO END IF
DO J=1,NSLPTL
DSTRES(I)=DSTRES(I)-DDEMSD(I,J)*DGAMMA(J) END DO END DO
IF (NSHR.GT.0) THEN DO I=1,NSHR
DO J=1,NDI
DSTRES(I+NDI)=DSTRES(I+NDI)+D(I+3,J)*DSTRAN(J) END DO
DO J=1,NSHR
DSTRES(I+NDI)=DSTRES(I+NDI)+D(I+3,J+3)*DSTRAN(J+NDI) END DO
DO J=1,NSLPTL
DSTRES(I+NDI)=DSTRES(I+NDI)-DDEMSD(I+3,J)*DGAMMA(J) END DO
END DO END IF
C----- Update the stress: STRESS DO I=1,NTENS
STRESS(I)=STRESS(I)+DSTRES(I)-DSOLD(I) END DO
C----- Increment of normal to a slip plane and a slip direction (only C needed for finite rotation) C
IF (NLGEOM.NE.0) THEN DO J=1,NSLPTL DO I=1,3
DSPNOR(I,J)=0. DSPDIR(I,J)=0.
DO K=1,3
DSPNOR(I,J)=DSPNOR(I,J)-SLPNOR(K,J)*DVGRAD(K,I) DSPDIR(I,J)=DSPDIR(I,J)+SLPDIR(K,J)*DVGRAD(I,K) END DO
END DO END DO
C----- Update the normal to a slip plane and a slip direction (only C needed for finite rotation) C
IDNOR=3*NSLPTL IDDIR=6*NSLPTL DO J=1,NSLPTL DO I=1,3
IDNOR=IDNOR+1
STATEV(IDNOR)=STATEV(IDNOR)+DSPNOR(I,J)-DSPNRO(I,J)
IDDIR=IDDIR+1
STATEV(IDDIR)=STATEV(IDDIR)+DSPDIR(I,J)-DSPDRO(I,J) END DO END DO
END IF
C----- Derivative of shear strain increment in a slip system w.r.t. C strain increment: DDGDDE C
TERM1=THETA*DTIME DO I=1,NTENS DO J=1,NSLPTL
TAUSLP=STATEV(2*NSLPTL+J) GSLIP=STATEV(J) X=TAUSLP/GSLIP
TERM2=TERM1*DFDXSP(J)/GSLIP
IF (I.LE.NDI) THEN
DDGDDE(J,I)=TERM2*DDEMSD(I,J) ELSE
DDGDDE(J,I)=TERM2*DDEMSD(I-NDI+3,J) END IF END DO
CALL LUBKSB (WORKST, NSLPTL, ND, INDX, DDGDDE(1,I))
END DO
C----- Derivative of stress increment w.r.t. strain increment, i.e. C Jacobian matrix C
C----- Jacobian matrix: elastic part DO J=1,NTENS DO I=1,NTENS DDSDDE(I,J)=0. END DO END DO
DO J=1,NDI DO I=1,NDI
DDSDDE(I,J)=D(I,J)
IF (NLGEOM.NE.0) DDSDDE(I,J)=DDSDDE(I,J)-STRESS(I) END DO END DO
IF (NSHR.GT.0) THEN DO J=1,NSHR DO I=1,NSHR
DDSDDE(I+NDI,J+NDI)=D(I+3,J+3) END DO
DO I=1,NDI
DDSDDE(I,J+NDI)=D(I,J+3) DDSDDE(J+NDI,I)=D(J+3,I) IF (NLGEOM.NE.0)
2 DDSDDE(J+NDI,I)=DDSDDE(J+NDI,I)-STRESS(J+NDI) END DO END DO END IF
C----- Jacobian matrix: plastic part (slip)