kmatinv.F

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C Computes AINV(NEL,3,3) which is the inverse of MAT(NEL,3,3)
!||====================================================================
!||    kmatinv3    ../engine/source/materials/tools/kmatinv.F
!||--- called by ------------------------------------------------------
!||    calcmatb    ../engine/source/materials/mat/mat100/calcmatb.F
!||    sigeps100   ../engine/source/materials/mat/mat100/sigeps100.F90
!||    sigeps95    ../engine/source/materials/mat/mat095/sigeps95.F
!||====================================================================
       SUBROUTINE kmatinv3(MAT, AINV  ,NEL)
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
 
      INTEGER I,NEL,N
C-----------------------------------------------
 
      my_real  fac,deta, mat(nel,3,3),ainv(nel,3,3)
C-----------------------------------------------
C
        DO i= 1,nel
          deta=mat(i,1,1)*mat(i,2,2)*mat(i,3,3) -mat(i,1,1)*mat(i,2,3)*mat(i,3,2) -
     .         mat(i,3,3)*mat(i,1,2)*mat(i,2,1) +mat(i,1,2)*mat(i,2,3)*mat(i,3,1) +
     .         mat(i,2,1)*mat(i,3,2)*mat(i,1,3) -mat(i,2,2)*mat(i,3,1)*mat(i,1,3)
          IF(deta == zero)deta = em20
          fac=one/ deta
          !transpose(comatrice)/det
          ainv(i,1,1)=fac*(mat(i,2,2)*mat(i,3,3)-mat(i,2,3)*mat(i,3,2))
          ainv(i,2,2)=fac*(mat(i,1,1)*mat(i,3,3)-mat(i,3,1)*mat(i,1,3))
          ainv(i,3,3)=fac*(mat(i,1,1)*mat(i,2,2)-mat(i,1,2)*mat(i,2,1))
          ainv(i,1,2)=fac*(mat(i,3,2)*mat(i,1,3)-mat(i,3,3)*mat(i,1,2))
          ainv(i,2,3)=fac*(mat(i,2,1)*mat(i,1,3)-mat(i,1,1)*mat(i,2,3))
          ainv(i,3,1)=fac*(mat(i,2,1)*mat(i,3,2)-mat(i,2,2)*mat(i,3,1))
          ainv(i,2,1)=fac*(mat(i,2,3)*mat(i,3,1)-mat(i,3,3)*mat(i,2,1))
          ainv(i,3,2)=fac*(mat(i,1,2)*mat(i,3,1)-mat(i,1,1)*mat(i,3,2))
          ainv(i,1,3)=fac*(mat(i,1,2)*mat(i,2,3)-mat(i,2,2)*mat(i,1,3))
        
        ENDDO  
C
      RETURN
      END