113 lines
3.5 KiB
Text
113 lines
3.5 KiB
Text
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c 2D XFEM Corrosion Element
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subroutine uel(rhs,amatrx,svars,energy,ndofel,nrhs,nsvars,props,
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1 nprops,coords,mcrd,nnode,u,du,v,a,jtype,time,dtime,kstep,kinc,
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2 jelem,params,ndload,jdltyp,adlmag,predef,npredf,lflags,
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3 mlvarx,ddlmag,mdload,pnewdt,jprops,njprop,period)
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c
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include 'aba_param.inc'
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c
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dimension rhs(mlvarx,*),amatrx(ndofel,ndofel),svars(nsvars),
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1 energy(8),props(*),coords(mcrd,nnode),
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2 u(ndofel),du(mlvarx,*),v(ndofel),a(ndofel),time(2),
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3 params(3),jdltyp(mdload,*),adlmag(mdload,*),
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4 ddlmag(mdload,*),predef(2,npredf,nnode),lflags(*),jprops(*)
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c
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dimension phig(8),phih(8),phi(8),phix(8),phiy(8)
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dimension crdnx(4),crdny(4),dndg(4),dndh(4)
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dimension theta(4),rjac(2,2),rjaci(2,2)
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dimension gx(100,4),hx(100,4),xi(2),yi(2),gi(2),hi(2)
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dimension c(2),gp(2,8),gm2(8,8)
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c
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parameter(zero=0.d0,one=1.d0)
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c material property definition
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thick = 1.
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rho = 1.
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c initialization (nrhs=1)
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do k1=1,ndofel
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rhs(k1,nrhs)=zero
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do k2=1,ndofel
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amatrx(k2,k1)=zero
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enddo
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enddo
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if (lflags(1).eq.33) then
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do icrd=1,4
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crdnx(icrd)=coords(1,icrd)
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crdny(icrd)=coords(2,icrd)
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enddo
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c Normal Shp Funs
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ienr=1
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gpos=1/sqrt(3.)
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gx(1,1)=-gpos
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gx(1,2)=gpos
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gx(1,3)=gpos
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gx(1,4)=-gpos
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hx(1,1)=-gpos
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hx(1,2)=-gpos
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hx(1,3)=gpos
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hx(1,4)=gpos
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c assemble amatrx and rhs
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do i=1,ienr
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do j=1,4
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g=gx(i,j)
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h=hx(i,j)
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phi(1)=0.25*(1.-g)*(1.-h)
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phi(2)=0.25*(1.+g)*(1.-h)
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phi(3)=0.25*(1.+g)*(1.+h)
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phi(4)=0.25*(1.-g)*(1.+h)
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cond=1.
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spec=1.
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phig(1)=0.25*-(1.-h)
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phig(2)=0.25*(1.-h)
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phig(3)=0.25*(1.+h)
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phig(4)=0.25*-(1.+h)
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phih(1)=0.25*-(1.-g)
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phih(2)=0.25*-(1.+g)
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phih(3)=0.25*(1.+g)
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phih(4)=0.25*(1.-g)
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rjac=zero
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do iter=1,4
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rjac(1,1)=rjac(1,1)+phig(iter)*crdnx(iter)
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rjac(1,2)=rjac(1,2)+phig(iter)*crdny(iter)
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rjac(2,1)=rjac(2,1)+phih(iter)*crdnx(iter)
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rjac(2,2)=rjac(2,2)+phih(iter)*crdny(iter)
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enddo
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djac=rjac(1,1)*rjac(2,2)-rjac(1,2)*rjac(2,1)
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rjaci(1,1)= rjac(2,2)/djac
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rjaci(2,2)= rjac(1,1)/djac
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rjaci(1,2)=-rjac(1,2)/djac
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rjaci(2,1)=-rjac(2,1)/djac
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do iter=1,4
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phix(iter)=rjaci(1,1)*phig(iter)+
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1 rjaci(1,2)*phih(iter)
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phiy(iter)=rjaci(2,1)*phig(iter)+
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1 rjaci(2,2)*phih(iter)
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enddo
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dtdx=zero
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dtdy=zero
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t =zero
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told=zero
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do iter=1,4
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dtdx=u(iter)*phix(iter)+dtdx
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dtdy=u(iter)*phiy(iter)+dtdy
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t=u(iter)*phi(iter)+t
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told=(u(iter)-du(iter,nrhs))*phi(iter)+told
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end do
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dtdt=(t-told)/dtime
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we=djac
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do ki=1,4
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c loop over nodes
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rhs(ki,nrhs) = rhs(ki,nrhs) -
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1 (we/float(ienr))*(phi(ki)*rho*spec*dtdt+
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2 cond*(phix(ki)*dtdx + phiy(ki)*dtdy))
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do kj=1,4
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amatrx(ki,kj)=amatrx(ki,kj)+(we/float(ienr))
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1 *(phi(ki)*phi(kj)*rho*spec/dtime+cond
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2 *(phix(ki)*phix(kj)+phiy(ki)*phiy(kj)))
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end do
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end do
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enddo
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enddo
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end if
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return
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end
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