gray30.F

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!||====================================================================
!||    gray30   ../engine/source/materials/mat/mat016/gray30.F
!||--- called by ------------------------------------------------------
!||    mmain    ../engine/source/materials/mat_share/mmain.F90
!||====================================================================
      SUBROUTINE gray30(SIG  ,EINT ,QOLD ,VOL ,QNEW,
     2                  VNEW ,DVOL ,NEL  ,P01 ,P02, 
     3                  E01  ,E02  ,PNEW)
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   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER NEL
      my_real
     .   sig(nel,6), eint(*), qold(*), vol(*), qnew(*), vnew(*), dvol(*),
     .   p01(*), p02(*), e01(*), e02(*), pnew(*)
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I
      my_real
     .    pe21(mvsiz),
     .    e21, p21, dede, dq, ei3
C-----------------------------------------------
C   S o u r c e   L i n e s
C-----------------------------------------------
      
      DO i=1,nel
        e21       = e02(i)-e01(i)
        p21       = p02(i)-p01(i)
        IF(e21==zero)THEN
          pe21(i) = zero
        ELSE
          pe21(i) = p21/e21
        ENDIF
      ENDDO !next I
 
      DO i=1,nel
        dede      = dvol(i)*pe21(i)*half
        dq        = dvol(i)*(qnew(i)-qold(i))*half
        qold(i)   = qnew(i)
        ei3       =(e02(i)-dq+e01(i)*dede)/(1.+dede)
        ei3       = max(zero,ei3)
        pnew(i)   = p01(i)+(ei3-e01(i))*pe21(i)
        eint(i)   = eint(i)-dvol(i)*(pnew(i)+qnew(i))*half
        eint(i)   = eint(i)/vol(i)
      ENDDO !next I
 
      DO i=1,nel
        sig(i,1)  = sig(i,1)-pnew(i)
        sig(i,2)  = sig(i,2)-pnew(i)
        sig(i,3)  = sig(i,3)-pnew(i)
      ENDDO !next I
 
      RETURN
      END