80 lines
2.5 KiB
Text
80 lines
2.5 KiB
Text
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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,
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2 kinc,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 gpx(9),gwei(9),phi(8),phix(8),phic(8),stiffk(2,2)
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dimension stiffm(2,2)
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c
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c print *,u(1),u(2),du(1,nhrs),du(2,nhrs),time(1),lflags(3)
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c material property definition
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rho = 1.
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spec = 1.
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conduc = 1.
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c initialization (nrhs=1)
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do k1=1,ndofel
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rhs(k1,nrhs)=0.
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do k2=1,ndofel
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amatrx(k2,k1)=0.
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stiffk(k2,k1)=0.
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stiffm(k2,k1)=0.
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enddo
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enddo
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if (lflags(3).eq.4) return
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c transient analysis
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if (lflags(1).eq.33) then
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c determine gauss point locations
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gpx(1)=-1./sqrt(3.)
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gpx(2)=1./sqrt(3.)
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gwei(1)=1.
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gwei(2)=1.
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c assemble amatrx and rhs
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do k=1,2
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c loop through gauss pts
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c=gpx(k)
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c get shape functions and derivatives
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phi(1)=(1.-c)/2.
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phi(2)=(1.+c)/2.
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phic(1)=-0.5
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phic(2)=0.5
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dxdc=abs(coords(1,2)-coords(1,1))/2.
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ajacob=dxdc
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phix(1)=phic(1)*(1./ajacob)
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phix(2)=phic(2)*(1./ajacob)
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c interpolate temperatures to int points
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dtdx=u(1)*phix(1)+u(2)*phix(2)
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t=u(1)*phi(1)+u(2)*phi(2)
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told=(u(1)-du(1,nrhs))*phi(1)+(u(2)-du(2,nrhs))*phi(2)
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c other housekeeping
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cond=conduc
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dtdt=(t-told)/dtime
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we=gwei(k)*ajacob
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c Assemble Element Stiffness Matrix and Add to Global
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do ki=1,2
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c loop over nodes
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rhs(ki,nrhs)=rhs(ki,nrhs)-we*(phi(ki)*rho*spec*dtdt
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1 + cond*(phix(ki)*dtdx))
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do kj=1,2
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stiffk(ki,kj)=stiffk(ki,kj)+
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1 we*cond*(phix(ki)*phix(kj))
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stiffm(ki,kj)=stiffm(ki,kj)+
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1 we*(phi(ki)*phi(kj)*rho*spec)/dtime
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end do
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end do
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do i=1,2
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do j=1,2
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amatrx(i,j)=stiffk(i,j)+stiffm(i,j)
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enddo
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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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