C LADEP     SOURCE    CB215821  16/04/21    21:17:39     8920
      SUBROUTINE LADEP(S1,DEP,PAEC,SEQ,NSTRS,IFOU,
     & DFSIG,D2FSIG,DLAM,D,DP,BETJEF)
C
      IMPLICIT INTEGER(I-N)
      IMPLICIT REAL*8 (A-H,O-Z)
      DIMENSION S1(4),DEP(4,4),DP(4,4),AH(4,4),IS(4)
      DIMENSION D(4,4),AC(6),AB(6),D2FSIG(4,4),DFSIG(4)
      DIMENSION AI(4,4), AJ(4,4), AK(4,4),AKI(4,4)
*
      SEGMENT BETJEF
       REAL*8 AA,BETA,RB,ALPHA,YOUN,XNU,GFC,GFT,CAR,ETA,TDEF,
     &          TCON,DPSTF1,DPSTF2,TETA,PDT,TP0
       INTEGER ICT,ICC,IMOD,IVISS,ITER,
     &                ISIM,IBB1,IGAU1,IZON
      ENDSEGMENT
*
*     COMMON /DBETJEF/AA,BETA,RB,ALPHA,YOUN,XNU,GFC,GFT,CAR,ETA,TDEF,
*    &          TCON,DPSTF1,DPSTF2,TETA,PDT,ICT,ICC,IMOD,IVISS,ITER,
*    &                ISIM,IBB1,IGAU1,IZON
C             *************************************************
C             **  CALCUL DE LA MATRICE ELASTOPLASTIQUE [Dep] **
C             *************************************************
C-------------------------------------------------------------------
      CALL ZERO(DEP,4,4)
      CALL ZERO(DP,4,4)
      CALL ZERO(AB,6,1)
      CALL ZERO(AC,6,1)
C-------------------------------------------------------------------
      IF (IMOD.EQ.1.OR.IMOD.EQ.3) THEN
      AD=YOUN/(1.D0-XNU*XNU)
      D(1,1)=AD
      D(2,2)=D(1,1)
      D(3,3)=AD*(1.D0-XNU)/2.D0
      D(1,2)=AD*XNU
      D(2,1)=D(1,2)
      D(1,3)=0.D0
      D(2,3)=0.D0
      D(3,1)=0.D0
      D(3,2)=0.D0
      ENDIF
      IF (IMOD.EQ.2.OR.IMOD.EQ.4) THEN
      ADD=YOUN/((1.D0+XNU)*(1.D0-2.D0*XNU))
      D(1,1)=ADD*(1.D0-XNU)
      D(2,2)=D(1,1)
      D(3,3)=D(1,1)
      D(1,2)=ADD*XNU
      D(2,1)=D(1,2)
      D(1,3)=D(1,2)
      D(2,3)=D(1,2)
      D(3,1)=D(1,2)
      D(3,2)=D(1,2)
      D(1,4)=0.D0
      D(2,4)=0.D0
      D(3,4)=0.D0
      D(4,1)=0.D0
      D(4,2)=0.D0
      D(4,3)=0.D0
      D(4,4)=0.5*ADD*(1.D0-2.D0*XNU)
      ENDIF
C-------------------------------------------------------------------
      DO 1 I=1,NSTRS
      DO 1 J=1,NSTRS
        IF (I.EQ.J) THEN
         AI(I,J)=1.D0
        ELSE
         AI(I,J)=0.D0
        ENDIF
    1 CONTINUE
C
      DO 2 I=1,NSTRS
      DO 2 J=1,NSTRS
         AJ(I,J)=D(I,J)
    2 CONTINUE
C-------------------------------------------------------------------
      CALL INVMA2(AJ,NSTRS,ISING)
      IF (ISING.EQ.1) THEN
C       WRITE(*,*)'MATRICE AJ singuliere dans eladep '
      ENDIF
C-------------------------------------------------------------------
C
      DO 3 I=1,NSTRS
      DO 3 J=1,NSTRS
        AK(I,J)=AJ(I,J)+DLAM*D2FSIG(I,J)
    3 CONTINUE
      DO 13 I=1,NSTRS
      DO 13 J=1,NSTRS
        AH(I,J)=AK(I,J)
   13 CONTINUE
C-------------------------------------------------------------------
      CALL INVMA2(AH,NSTRS,ISING)
      IF (ISING.EQ.1) THEN
C       WRITE(*,*)'MATRICE AKI singuliere ds ladep '
      ENDIF
C-------------------------------------------------------------------
C
      DO 5 I=1,NSTRS
      DO 5 J=1,NSTRS
        AB(I)=AB(I)+AH(I,J)*DFSIG(J)
    5 CONTINUE
C
      DO 6 I=1,NSTRS
      DO 6 J=1,NSTRS
       AC(I)=AC(I)+AH(J,I)*DFSIG(J)
    6 CONTINUE
C
      DO 7 I=1,NSTRS
      DO 7 J=1,NSTRS
       DP(I,J)=DP(I,J)+AB(I)*AC(J)
    7 CONTINUE
C
      H1=0.D0
      DO 8 I=1,NSTRS
        H1=H1+DFSIG(I)*AB(I)
    8 CONTINUE
C
      HA=H1+PAEC
      DO 9 I=1,NSTRS
      DO 9 J=1,NSTRS
       DP(I,J)=DP(I,J)/HA
       DEP(I,J)=AH(I,J)-DP(I,J)
    9 CONTINUE
C
      DO 10 I=1,NSTRS
      DO 10 J=1,NSTRS
        IF (ABS(DEP(I,J)).LT.1.D-5) THEN
          DEP(I,J)=0.D0
        ENDIF
   10 CONTINUE
C-------------------------------------------------------------------
      RETURN
      END