s8eprst_ini.F

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!||====================================================================
!||    s8eprst_ini   ../engine/source/elements/solid/solide8e/s8eprst_ini.F
!||--- called by ------------------------------------------------------
!||    s8eforc3      ../engine/source/elements/solid/solide8e/s8eforc3.F
!||    s8sforc3      ../engine/source/elements/solid/solide8s/s8sforc3.F
!||====================================================================
      SUBROUTINE s8eprst_ini(PR ,PS ,PT )
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-----------------------------------------------
      my_real
     .   pr(8,8),ps(8,8),pt(8,8)
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I, J ,IP
      my_real
     .   pg2,ksi(8),eta(8),zeta(8),etazeta(8),ksieta(8),ksizeta(8),pg,mpg
       parameter(pg=.577350269189625d0)
       parameter(mpg=-pg)
      DATA ksi / mpg, pg, mpg, pg, mpg, pg, mpg, pg/
      DATA eta / mpg,mpg,  pg, pg, mpg, mpg, pg, pg/
      DATA zeta / mpg,mpg, mpg, mpg, pg, pg, pg, pg/
C-----------------------------------------------
      pg2=pg*pg
      etazeta(1) = pg2
      etazeta(2) = pg2
      etazeta(3) = -pg2
      etazeta(4) = -pg2
      etazeta(5) = -pg2
      etazeta(6) = -pg2
      etazeta(7) = pg2
      etazeta(8) = pg2
C
      ksieta(1) = pg2
      ksieta(2) = -pg2
      ksieta(3) = -pg2
      ksieta(4) = pg2
      ksieta(5) = pg2
      ksieta(6) = -pg2
      ksieta(7) = -pg2
      ksieta(8) = pg2
C
      ksizeta(1) = pg2
      ksizeta(2) = -pg2
      ksizeta(3) = pg2
      ksizeta(4) = -pg2
      ksizeta(5) = -pg2
      ksizeta(6) = pg2
      ksizeta(7) = -pg2
      ksizeta(8) = pg2
C------NI,ksi-----ETA(IP),ZETA(IP),KSIETA(IP).....--
      DO ip = 1,8
       pr(1,ip)=-(one-eta(ip)-zeta(ip)+etazeta(ip))
       pr(2,ip)=-pr(1,ip)
       pr(3,ip)= one+eta(ip)-zeta(ip)-etazeta(ip)
       pr(4,ip)=-pr(3,ip)
       pr(5,ip)=-(one-eta(ip)+zeta(ip)-etazeta(ip))
       pr(6,ip)=-pr(5,ip)
       pr(7,ip)= one+eta(ip)+zeta(ip)+etazeta(ip)
       pr(8,ip)=-pr(7,ip)
       ps(1,ip)=-(one-ksi(ip)-zeta(ip)+ksizeta(ip))
       ps(2,ip)=-(one+ksi(ip)-zeta(ip)-ksizeta(ip))
       ps(3,ip)=-ps(2,ip)
       ps(4,ip)=-ps(1,ip)
       ps(5,ip)=-(one-ksi(ip)+zeta(ip)-ksizeta(ip))
       ps(6,ip)=-(one+ksi(ip)+zeta(ip)+ksizeta(ip))
       ps(7,ip)=-ps(6,ip)
       ps(8,ip)=-ps(5,ip)
       pt(1,ip)=-(one-ksi(ip)-eta(ip)+ksieta(ip))
       pt(2,ip)=-(one+ksi(ip)-eta(ip)-ksieta(ip))
       pt(3,ip)=-(one+ksi(ip)+eta(ip)+ksieta(ip))
       pt(4,ip)=-(one-ksi(ip)+eta(ip)-ksieta(ip))
       pt(5,ip)=-pt(1,ip)
       pt(6,ip)=-pt(2,ip)
       pt(7,ip)=-pt(3,ip)
       pt(8,ip)=-pt(4,ip)
      END DO !IP = 1,8
      
      RETURN
      END