r12mat3.F

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!||====================================================================
!||    r12mat3   ../engine/source/elements/spring/r12mat3.F
!||--- called by ------------------------------------------------------
!||    r12ke3    ../engine/source/elements/spring/r12ke3.F
!||--- calls      -----------------------------------------------------
!||    rkenonl   ../engine/source/elements/spring/r4mat3.F
!||====================================================================
      SUBROUTINE r12mat3(JFT    ,JLT    ,GEO    ,KX     ,MGN    ,
     .                   DKX    ,BETA   ,AL0    ,FX     ,DX     ,
     .                   TF     ,NPF    ,POS    ,IGEO   )
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   G l o b a l   P a r a m e t e r s
C-----------------------------------------------
#include      "mvsiz_p.inc"
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "param_c.inc"
#include      "impl1_c.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER JFT    ,JLT, MGN(*),IGEO(NPROPGI,*),NPF(*)
C     REAL
      my_real
     .   geo(npropg,*), kx(*),beta(*),dkx(*),al0(*),
     .   fx(*),dx(*),tf(*),pos(*)
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I,ILEN,ILENG
      INTEGER IECROU(MVSIZ), IFUNC(MVSIZ),IFUNC2(MVSIZ)
C     REAL
      my_real
     .   a(mvsiz),fric,ff
C-----------------------------------------------
C
      DO i=jft,jlt
       kx(i)=geo(2,mgn(i))
      ENDDO
      ilen = 0
      DO i=jft,jlt
       a(i)   =geo(10,mgn(i))
C       KX(I)=A(I)*KX(I)
       ileng=nint(geo(93,mgn(i)))
       IF(ileng/=0) ilen = 1
      ENDDO
      IF(ilen/=0) THEN
       DO i=jft,jlt
        ileng=nint(geo(93,mgn(i)))
        IF(ileng/=0)THEN
          kx(i)=kx(i)/al0(i)
        ENDIF
       ENDDO
      ENDIF
C
      DO i=jft,jlt
       fric= geo(17,mgn(i))
       IF(fric/=zero)THEN
        dkx(i) = kx(i)*tanh(half*fric*beta(i))
       ELSE
        dkx(i)=zero
       ENDIF
      ENDDO
      IF (ismdisp>0.OR.isprn==1) THEN
       DO i=jft,jlt
        iecrou(i)=nint(geo(7,mgn(i)))
        ifunc(i) =igeo(101,mgn(i))
        ifunc2(i)=igeo(103,mgn(i))
       ENDDO
       CALL rkenonl(jft    ,jlt    ,kx     ,fx     ,dx     ,
     .              iecrou ,ifunc  ,ifunc2 ,a      ,tf     ,
     .              npf    ,pos    )
      ENDIF
C
      RETURN
      END