C CHAFLU    SOURCE    OF166741  25/11/04    21:15:21     12349          
      SUBROUTINE CHAFLU(YUNG,XNU,IA,EI,SSTAR,
     1 XMAT,ALPHA1,IBOU,SI,DEPS,EPST,EPSTAR,AMTRI,
     2 ALPHA2,DPSM1,DPSM2,KERRE,NUMCHA,ecou,necou)
C
C            INTEGRATION MODELE DE CHABOCHE  EN FLUAGE
C
      IMPLICIT INTEGER(I-N)
      IMPLICIT REAL *8(A-H,O-Z)

-INC TECOU

      DIMENSION XMAT(*),EI(*),ALPHA1(*),ALPHA2(*)
      DIMENSION AMTRI(18,7),DELT(6)

C
C  necou.JFLUAG = 1  ON FLUE AVEC SIGMA ET ON RECUPERE SIGMA EN ENTREE
C  necou.JFLUAG = 2  ON FLUE AVEC (SIG-X) ET ON RECUPERE (SIG-X) EN ENTREE
C  necou.LFLUAG = 0  ON ECROUIT EN CAS DE FLUAGE
C  necou.LFLUAG = 1  ON N'ECROUIT PAS EN CAS DE FLUAGE
C
      IFLU=0
      IF (necou.JFLUAG.GT.1.AND.necou.LFLUAG.EQ.0) IFLU=1
C
      A2=0.
      C2=0.
      B=0.
      PHI=1.D00
      ICOD=0
      CALL CHALIM(EPSTAR,R,XMAT,TET,ICOD,A1,C1,A2,C2,R0,RM,B,
     . PHI,PSI,OME,ICENT2,IDIAM,NUMCHA)
      ELT=YUNG/(1.+XNU)
      IF(ITHER.NE.0) ELT=ELT*EI(IA)/YUNG
      G=ELT*0.5
      SAC1=A1*C1*PHI
      AC1=SAC1*0.66666667
      SAC2=A2*C2*PHI
      AC2=SAC2*0.66666667
      SAC12=SAC1+SAC2
      AC12=AC1+AC2
      GO TO (101,102,103,104,105,103,107,104,109,999,999,999,
     .       103,101),ITYP
101   NPLEIN=3
      IBO=1
      E(1)=ELT+AC12*IFLU
      E(2)=-0.5*E(1)
      E(3)=1.5*E(1)
      E(4)=-AC1
      E(5)=0.5*AC1
      E(6)=-1.5*AC1
      IF(ICENT2.EQ.0) GO TO 200
      E(7)=-AC2
      E(8)=0.5*AC2
      E(9)=-1.5*AC2
      GO TO 200
102   IBO=2
      GO TO 121
103   IBO=1
121   NPLEIN=2
      E(1)=G*(2.-XNU)/(1.-XNU)+SAC12*IFLU
      E(2)=G*(2.*XNU-1.)/(1.-XNU)
      E(3)=1.5*(ELT+AC12*IFLU)
      E(4)=-SAC1
      E(5)=0.
      E(6)=-SAC1
      IF(ICENT2.EQ.0) GO TO 200
      E(7)=-SAC2
      E(8)=0.
      E(9)=-SAC2
      GO TO 200
104   IBO=1
      GO TO 125
107   IBO=2
125   DUM=YUNG
      NPLEIN=1
      IF(ITHER.NE.0) DUM=DUM*EI(IA)/YUNG
      DUM=DUM+SAC12*IFLU
      E(1)=DUM
      E(4)=-SAC1
      IF(ICENT2.NE.0) E(7)=-SAC2
      GO TO 200
105   CONTINUE
109   CONTINUE
200   IBOU1=IBOU+1
      TAUX=0.
      TIME=TEMPS-HPAS
      ICLFLU=0
      IF(IT.NE.1) GO TO 201
C
C  MODIFS POUR LA 1-ERE ITERATION
C  ECOULEMENT SELON SIGMA
C
      S0=VONMIS(SIGEL,ITYP,ALFAH,COVNMS)
      CALL CRPLAW(VI0,EPSTAR,S0,TET,TIME,HPAS,ICLFLU,NCOURB)
      DPSM1=VI0
      EPST=EPSTAR+HPAS*VI0
      CALL CRPLAW(VIF,EPST,SSTAR,TET,TEMPS,HPAS,ICLFLU,NCOURB)
      DPSM2=SSTAR
      SF=SSTAR
      DEPS=(VI0+VIF)*0.5D0*HPAS
      EPST=EPSTAR+DEPS
C
C  TEST POUR LES CAS DE FLUAGE A SIGMA NON CTE ET AVEC SEUIL
C
      IF(DEPS.EQ.0.) GO TO 1380
      DEPSUR=0.
      IF(SF.NE.0.) DEPSUR=DEPS/SF
      CALL CHAINI(AMTRI,18,IBOU,NPLEIN,E,DEPSUR,IBO)
      IF(IFLU.EQ.0) GO TO 1531
      CALL CHAINI(AMTRI(IBOU1,1),18,IBOU,NPLEIN,E(4),DEPSUR,IBO)
      IF(ICENT2.EQ.1) CALL CHAINI(AMTRI(IBOU1+IBOU,1),18,IBOU,
     . NPLEIN,E(7),DEPSUR,IBO)
      DO 1334 IB=1,IBOU
      AMTRI(IB,7)=0.D0
      IB1=IB+IBOU
      IF(ICENT2.NE.0) GO TO 1335
      AMTRI(IB1,7)=ALPHA1(IB)
      GO TO 1334
1335  AMTRI(IB1,7)=ALPHA1(IB)-ALPHA2(IB)
      AMTRI(IB1+IBOU,7)=ALPHA2(IB)
1334  CONTINUE
      CALL CHAMAT(AMTRI,AMTRI(1,7),18,NPLEIN,IBOU,ICENT2,
     . C1,C2,DEPS,IBO,IFLU,1,LFLUAG,KERRE)
      IF(KERRE.NE.0) RETURN
      DO 1532 I=1,IBOU
      DSIGP(I)=-AMTRI(I,7)
      DO 1533 J=1,IBOU
        DSIGP(I)=DSIGP(I)+AMTRI(I,J)*SIGEL(J)
1533  CONTINUE
      STOT(I)=SIGEL(I)+DSIGP(I)
1532  CONTINUE
      GO TO 222
1531  DO 304 I=1,IBOU
      DSIGP(I)=0.
      DO 305 J=1,IBOU
        DSIGP(I)=DSIGP(I)+AMTRI(I,J)*SIGEL(J)
305   CONTINUE
      STOT(I)=SIGEL(I)+DSIGP(I)
304   CONTINUE
      GO TO 221
201   CONTINUE
      VI0=DPSM1
      SF=DPSM2
      EPST=EPSTAR+HPAS*VI0
      CALL CRPLAW(VIF,EPST,SF,TET,TEMPS,HPAS,ICLFLU,NCOURB)
      DEPS=(VI0+VIF)*0.5*HPAS
      EPST=EPSTAR+DEPS
1380  CONTINUE
      DEPSUR=0.
      IF(SF.NE.0.) DEPSUR=DEPS/SF
222   CALL CHAINI(AMTRI,18,IBOU,NPLEIN,E,DEPSUR,IBO)
221   IF(LFLUAG.EQ.1) GO TO 1240
      CALL CHAINI(AMTRI(IBOU1,1),18,IBOU,NPLEIN,E(4),DEPSUR,IBO)
      IF(ICENT2.EQ.1) CALL CHAINI(AMTRI(IBOU1+IBOU,1),18,IBOU,
     .  NPLEIN,E(7),DEPSUR,IBO)
1240  CONTINUE
      DO 202 I=1,IBOU
        AMTRI(I,I)=AMTRI(I,I)+1.D0
202   CONTINUE
C
C  SECOND MEMBRE
C
      DO 134 IB=1,IBOU
      AMTRI(IB,7)=STOT(IB)
      IF(LFLUAG.EQ.1) GO TO 134
      IB1=IB+IBOU
      IF(ICENT2.NE.0) GO TO 135
      AMTRI(IB1,7)=ALPHA1(IB)
      GO TO 134
135   AMTRI(IB1,7)=ALPHA1(IB)-ALPHA2(IB)
      AMTRI(IB1+IBOU,7)=ALPHA2(IB)
134   CONTINUE
      CALL CHAMAT(AMTRI,AMTRI(1,7),18,NPLEIN,IBOU,ICENT2,C1,C2,
     .  DEPS,IBO,IFLU,0,LFLUAG,KERRE)
      IF(KERRE.NE.0) RETURN
300   SI=VONMIS(AMTRI(1,7),ITYP,ALFAH,COVNMS)
      DPSM2=SI
      DO 301 I=1,IBOU
      SIGEL(I)=AMTRI(I,7)
      IF(LFLUAG.EQ.1) GO TO 301
      DALPHA(I)=AMTRI(IBOU+I,7)-ALPHA1(I)
      IF(ICENT2.EQ.0) GO TO 301
      DALPHA(I)=DALPHA(I)+AMTRI(IBOU+IBOU+I,7)
301   CONTINUE
C
C  LES DEUX CENTRES SONT CUMULES DANS ALPHA1
C
      IF(LFLUAG.EQ.1) RETURN
C
C   MISE A JOUR DES CENTRES DES SPHERES
C
      DO 303 I=1,IBOU
      ALPHA1(I)=AMTRI(IBOU+I,7)
      IF(ICENT2.EQ.0) GO TO 303
      ALPHA1(I)=ALPHA1(I)+AMTRI(IBOU+IBOU+I,7)
      ALPHA2(I)=AMTRI(IBOU+IBOU+I,7)
303   CONTINUE
      RETURN
999   WRITE(6,7999)
7999  FORMAT('0 CHAFLU - CAS NON IMPLEMENTE ' /)
      RETURN
      END