uroto_tens2d_aniso.F

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!||====================================================================
!||    uroto_tens2d_aniso   ../engine/source/materials/tools/uroto_tens2d_aniso.F
!||--- called by ------------------------------------------------------
!||    h3d_shell_tensor     ../engine/source/output/h3d/h3d_results/h3d_shell_tensor.F
!||    tensorc              ../engine/source/output/anim/generate/tensorc.F
!||====================================================================
      SUBROUTINE uroto_tens2d_aniso(NEL,TENS,DIR_A,DIR_B)
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER ,INTENT(IN) :: NEL
      my_real ,DIMENSION(NEL,2) ,INTENT(IN)    :: dir_a,dir_b
      my_real ,DIMENSION(NEL,3) ,INTENT(INOUT) :: tens
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER :: I
      my_real :: r1,r2,s1,s2,rs1,rs2,rs3,r12a,r22a,s12b,s22b,r3r3,s3s3,
     .           t1,t2,t3
c=======================================================================
      DO i = 1,nel
        r1   = dir_a(i,1)
        s1   = dir_a(i,2)
        r2   = dir_b(i,1)
        s2   = dir_b(i,2)
        rs1  = r1*s1                                                       
        rs2  = r2*s2                                                       
        r12a = r1*r1                                                       
        r22a = r2*r2                                                       
        s12b = s1*s1                                                       
        s22b = s2*s2                                                       
        rs3  = s1*s2-r1*r2                                                 
        r3r3 = one+s1*r2+r1*s2                                              
        r3r3 = half*r3r3                                                 
        s3s3 = one-s1*r2-r1*s2                                              
        s3s3 = half*s3s3                                                 
        t1 = tens(i,1)                                                     
        t2 = tens(i,2)                                                     
        t3 = tens(i,3)                                                     
        tens(i,1) = r12a*t1 + r22a*t2 - rs3*t3                             
        tens(i,2) = s12b*t1 + s22b*t2 + rs3*t3                             
        tens(i,3) = rs1*t1  + rs2*t2 + (r3r3 - s3s3)*t3                    
      ENDDO
c-----------
      RETURN
      END