func
C FUNC SOURCE CHAT 05/01/13 00:11:36 5004 c***************************************************************************** c sous rouine utilisee dans l'ecoulement plastique de la loi c de GURSON c********************************************************************** c this subroutine compute the value of the function c which zero is the increment of phi c c--- variables IMPLICIT INTEGER(I-N) IMPLICIT REAL*8 (A-H,O-Z) segment wrkgur real*8 sigbar, sy0,phi0,rho0,g,b,h real*8 epn,phin,sqrtj2,rho,sig(6) real*8 e(7),dt real*8 conv,tol1,tol2 endsegment * common/prop/sigbar,sy0,phi0,rho0,g,b,h * common/state/epn,phin,sqrtj2,rho,sig(6) c * common /toler/ conv,tol1,tol2 c c*** evaluate function -- q is dphi phi=phin+q syn=sy0+h*epn p=(1.d0-phi)*b*(1.d0-(1.d0-phi)*rho0/((1.d0-phi0)*rho)) syp=abs(1.d0+phi**2-2.d0*phi*cosh(-1.5d0*p/sigbar)) c if (syp .ge. tol1*tol1 ) then a=1.5d0*phi*(1.d0-phi)*sinh(-1.5d0*p/sigbar)/sqrt(syp) c if ( abs(a) .le. (1.d-2 * tol2) ) then c this is not consistent but this speeds up the convergence dep=(sqrtj2-syn*(1-phi))/(3*g+h*(1-phi)) else ratio=syn/(2.d0*h) dep=sqrt(ratio**2+abs(q/a)*sigbar/h)-ratio endif c else dep=0.d0 endif c syn1p=(syn+h*dep)*sqrt(syp) f=syn1p+3.d0*g*dep-sqrtj2 f=f/sy0 c return end c*****************************************************************************
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