viscpower.F

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C Non linear viscous model POWER LAW
C output: the creep strain increment DGAMMA
C-----------------------------------------------
!||====================================================================
!||    viscpower   ../engine/source/materials/mat/mat100/viscpower.F
!||--- called by ------------------------------------------------------
!||    sigeps100   ../engine/source/materials/mat/mat100/sigeps100.F90
!||====================================================================
        SUBROUTINE viscpower ( NEL, TBNORM,  A1,EXPM ,EXPN,GAMMAOLD, DGAMMA ) !POWER LAW
C-----------------------------------------------
C   I M P L I C I T   T Y P E S
C-----------------------------------------------
#include "implicit_f.inc"
C----------------------------------------------------------------
C  I N P U T   A R G U M E N T S
C----------------------------------------------------------------
      INTEGER, INTENT(IN) ::  NEL  
C
      my_real,  INTENT(IN) :: a1, expn ,expm  
C
      my_real, DIMENSION(NEL), INTENT(IN) ::  tbnorm,gammaold
C----------------------------------------------------------------
C  O U T P U T   A R G U M E N T S
C----------------------------------------------------------------
      my_real, DIMENSION(NEL), INTENT(OUT) ::  dgamma
C----------------------------------------------------------------
C  I N P U T  O U T P U T   A R G U M E N T S
C----------------------------------------------------------------
C----------------------------------------------------------------
C  L O C A L  V A R I B L E S
C----------------------------------------------------------------
      INTEGER    I
 
      my_real     
     .   temp1 ,temp2 , temp3  
C----------------------------------------------------------------
        DO i=1,nel 
          
          temp1 = (expm +one ) * gammaold(i)
          temp2 =  exp(expn*log(tbnorm(i))) 
          temp3 =  exp( expm*log(temp1) )     
          dgamma(i) = a1* exp(  (one/(one +expm)) *log(temp2 * temp3 )) 
 
        ENDDO
      RETURN
      END
C----------------------------------------------------------------