phd-scripts/Unpublished/XFEM2/XFEM/UEL_TRANHT.for

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No EOL
2.5 KiB
Fortran

subroutine uel(rhs,amatrx,svars,energy,ndofel,nrhs,nsvars,props
1 ,nprops,coords,mcrd,nnode,u,du,v,a,jtype,time,dtime,kstep,
2 kinc,jelem,params,ndload,jdltyp,adlmag,predef,npredf,lflags
3 ,mlvarx,ddlmag,mdload,pnewdt,jprops,njprop,period)
c
include 'aba_param.inc'
c
dimension rhs(mlvarx,*),amatrx(ndofel,ndofel),svars(nsvars),
1 energy(8),props(*),coords(mcrd,nnode),
2 u(ndofel),du(mlvarx,*),v(ndofel),a(ndofel),time(2),
3 params(3),jdltyp(mdload,*),adlmag(mdload,*),
4 ddlmag(mdload,*),predef(2,npredf,nnode),lflags(*),jprops(*)
c
dimension gpx(9),gwei(9),phi(8),phix(8),phic(8),stiffk(2,2)
dimension stiffm(2,2)
c
c print *,u(1),u(2),du(1,nhrs),du(2,nhrs),time(1),lflags(3)
c material property definition
rho = 1.
spec = 1.
conduc = 1.
c initialization (nrhs=1)
do k1=1,ndofel
rhs(k1,nrhs)=0.
do k2=1,ndofel
amatrx(k2,k1)=0.
stiffk(k2,k1)=0.
stiffm(k2,k1)=0.
enddo
enddo
if (lflags(3).eq.4) return
c transient analysis
if (lflags(1).eq.33) then
c determine gauss point locations
gpx(1)=-1./sqrt(3.)
gpx(2)=1./sqrt(3.)
gwei(1)=1.
gwei(2)=1.
c assemble amatrx and rhs
do k=1,2
c loop through gauss pts
c=gpx(k)
c get shape functions and derivatives
phi(1)=(1.-c)/2.
phi(2)=(1.+c)/2.
phic(1)=-0.5
phic(2)=0.5
dxdc=abs(coords(1,2)-coords(1,1))/2.
ajacob=dxdc
phix(1)=phic(1)*(1./ajacob)
phix(2)=phic(2)*(1./ajacob)
c interpolate temperatures to int points
dtdx=u(1)*phix(1)+u(2)*phix(2)
t=u(1)*phi(1)+u(2)*phi(2)
told=(u(1)-du(1,nrhs))*phi(1)+(u(2)-du(2,nrhs))*phi(2)
c other housekeeping
cond=conduc
dtdt=(t-told)/dtime
we=gwei(k)*ajacob
c Assemble Element Stiffness Matrix and Add to Global
do ki=1,2
c loop over nodes
rhs(ki,nrhs)=rhs(ki,nrhs)-we*(phi(ki)*rho*spec*dtdt
1 + cond*(phix(ki)*dtdx))
do kj=1,2
stiffk(ki,kj)=stiffk(ki,kj)+
1 we*cond*(phix(ki)*phix(kj))
stiffm(ki,kj)=stiffm(ki,kj)+
1 we*(phi(ki)*phi(kj)*rho*spec)/dtime
end do
end do
do i=1,2
do j=1,2
amatrx(i,j)=stiffk(i,j)+stiffm(i,j)
enddo
enddo
enddo
end if
return
end