! ! CalculiX - A 3-dimensional finite element program ! Copyright (C) 1998-2007 Guido Dhondt ! ! This program is free software; you can redistribute it and/or ! modify it under the terms of the GNU General Public License as ! published by the Free Software Foundation(version 2); ! ! ! This program is distributed in the hope that it will be useful, ! but WITHOUT ANY WARRANTY; without even the implied warranty of ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ! GNU General Public License for more details. ! ! You should have received a copy of the GNU General Public License ! along with this program; if not, write to the Free Software ! Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. ! subroutine hyperelastics(inpc,textpart,elcon,nelcon, & nmat,ntmat_,ncmat_,irstrt,istep,istat,n,iperturb,iline,ipol, & inl,ipoinp,inp,ipoinpc) ! ! reading the input deck: *HYPERELASTIC ! implicit none ! character*1 inpc(*) character*132 textpart(16) ! integer nelcon(2,*),nmat,ntmat,ntmat_,istep,istat,ipoinpc(0:*), & n,key,i,j,k,ityp,iperturb,iend,jcoef(3,14),ncmat_,irstrt, & iline,ipol,inl,ipoinp(2,*),inp(3,*) ! real*8 elcon(0:ncmat_,ntmat_,*),um ! ! jcoef indicates for each hyperelastic model the position of ! the compressibility coefficients in the field elcon (max. 3 ! positions per model) ! data jcoef /3,0,0,3,0,0,2,0,0,3,0,0,5,6,0,7,8,9,3,0,0, & 6,7,0,12,13,14,2,0,0,3,4,0,4,5,6,5,0,0,4,5,6/ ! ntmat=0 iperturb=3 ! if((istep.gt.0).and.(irstrt.ge.0)) then write(*,*) '*ERROR in hyperelastics: *HYPERELASTIC should be' write(*,*) ' placed before all step definitions' stop endif ! if(nmat.eq.0) then write(*,*) '*ERROR in hyperelastics: *HYPERELASTIC should be' write(*,*) ' preceded by a *MATERIAL card' stop endif ! ityp=-7 ! do i=2,n if(textpart(i)(1:12).eq.'ARRUDA-BOYCE') then ityp=-1 elseif(textpart(i)(1:13).eq.'MOONEY-RIVLIN') then ityp=-2 elseif(textpart(i)(1:8).eq.'NEOHOOKE') then ityp=-3 elseif(textpart(i)(1:5).eq.'OGDEN') then ityp=-4 elseif(textpart(i)(1:10).eq.'POLYNOMIAL') then ityp=-7 elseif(textpart(i)(1:17).eq.'REDUCEDPOLYNOMIAL') then ityp=-10 elseif(textpart(i)(1:11).eq.'VANDERWAALS') then ityp=-13 elseif(textpart(i)(1:4).eq.'YEOH') then ityp=-14 elseif(textpart(i)(1:2).eq.'N=') then if(textpart(i)(3:3).eq.'1') then elseif(textpart(i)(3:3).eq.'2') then if(ityp.eq.-4) then ityp=-5 elseif(ityp.eq.-7) then ityp=-8 elseif(ityp.eq.-10) then ityp=-11 else write(*,*) '*WARNING in hyperelastics: N=2 is not appl &icable for this material type; ' call inputerror(inpc,ipoinpc,iline) endif elseif(textpart(i)(3:3).eq.'3') then if(ityp.eq.-4) then ityp=-6 elseif(ityp.eq.-7) then ityp=-9 elseif(ityp.eq.-10) then ityp=-12 else write(*,*) '*WARNING in hyperelastics: N=3 is not appl &icable for this material type; ' call inputerror(inpc,ipoinpc,iline) endif else write(*,*) '*WARNING in hyperelastics: only N=1, N=2, or &N=3 are allowed; ' call inputerror(inpc,ipoinpc,iline) endif else write(*,*) '*WARNING in hyperelastics: unknown option:' write(*,'(a132)') textpart(i) endif enddo ! nelcon(1,nmat)=ityp ! if((ityp.ne.-6).and.(ityp.ne.-9)) then if((ityp.eq.-3).or.(ityp.eq.-10)) then iend=2 elseif((ityp.eq.-1).or.(ityp.eq.-2).or.(ityp.eq.-4).or. & (ityp.eq.-7)) then iend=3 elseif(ityp.eq.-11) then iend=4 elseif(ityp.eq.-13) then iend=5 elseif((ityp.eq.-5).or.(ityp.eq.-12).or.(ityp.eq.-14)) then iend=6 elseif(ityp.eq.-8) then iend=7 endif do call getnewline(inpc,textpart,istat,n,key,iline,ipol,inl, & ipoinp,inp,ipoinpc) if((istat.lt.0).or.(key.eq.1)) exit ntmat=ntmat+1 nelcon(2,nmat)=ntmat if(ntmat.gt.ntmat_) then write(*,*) '*ERROR in hyperelastics: increase ntmat_' stop endif do i=1,iend read(textpart(i)(1:20),'(f20.0)',iostat=istat) & elcon(i,ntmat,nmat) if(istat.gt.0) call inputerror(inpc,ipoinpc,iline) enddo read(textpart(iend+1)(1:20),'(f20.0)',iostat=istat) & elcon(0,ntmat,nmat) if(istat.gt.0) call inputerror(inpc,ipoinpc,iline) enddo else do call getnewline(inpc,textpart,istat,n,key,iline,ipol,inl, & ipoinp,inp,ipoinpc) if((istat.lt.0).or.(key.eq.1)) exit ntmat=ntmat+1 nelcon(2,nmat)=ntmat if(ntmat.gt.ntmat_) then write(*,*) '*ERROR in hyperelastics: increase ntmat_' stop endif do i=1,8 read(textpart(i)(1:20),'(f20.0)',iostat=istat) & elcon(i,ntmat,nmat) if(istat.gt.0) call inputerror(inpc,ipoinpc,iline) enddo ! if(ityp.eq.-6) then iend=1 else iend=4 endif call getnewline(inpc,textpart,istat,n,key,iline,ipol,inl, & ipoinp,inp,ipoinpc) if((istat.lt.0).or.(key.eq.1)) then write(*,*) & '*ERROR in hyperelastics: hyperelastic definition' write(*,*) ' is not complete. ' call inputerror(inpc,ipoinpc,iline) stop endif do i=1,iend read(textpart(i)(1:20),'(f20.0)',iostat=istat) & elcon(8+i,ntmat,nmat) if(istat.gt.0) call inputerror(inpc,ipoinpc,iline) enddo read(textpart(iend+1)(1:20),'(f20.0)',iostat=istat) & elcon(0,ntmat,nmat) if(istat.gt.0) call inputerror(inpc,ipoinpc,iline) enddo endif ! ! if any of the compressibility coefficients is zero (incompressible ! material), it is replaced. The lowest order coefficient is replaced ! such that it corresponds to a Poisson coeffient of 0.475, the ! following ones are replaced by a power of the first one ! do j=1,ntmat ! ! calculating the shear coefficient in the undeformed state ! if(ityp.eq.-1) then um=elcon(1,j,nmat) elseif(ityp.eq.-2) then um=2.d0*(elcon(1,j,nmat)+elcon(2,j,nmat)) elseif(ityp.eq.-3) then um=2.d0*elcon(1,j,nmat) elseif(ityp.eq.-4) then um=elcon(1,j,nmat) elseif(ityp.eq.-5) then um=elcon(1,j,nmat)+elcon(3,j,nmat) elseif(ityp.eq.-6) then um=elcon(1,j,nmat)+elcon(3,j,nmat)+elcon(5,j,nmat) elseif((ityp.eq.-7).or.(ityp.eq.-8).or.(ityp.eq.-9)) then um=2.d0*(elcon(1,j,nmat)+elcon(2,j,nmat)) elseif((ityp.eq.-10).or.(ityp.eq.-11).or.(ityp.eq.-12)) then um=2.d0*elcon(1,j,nmat) elseif(ityp.eq.-13) then um=elcon(1,j,nmat) elseif(ityp.eq.-14) then um=2.d0*elcon(1,j,nmat) endif ! do i=1,3 k=jcoef(i,abs(ityp)) if(k.eq.0) exit if(dabs(elcon(k,j,nmat)).lt.1.d-10) then elcon(k,j,nmat)=(0.1d0/um)**i write(*,*) '*WARNING in hyperelastics: default value was' write(*,*) ' used for compressibility coefficient &s' write(*,100) i,elcon(k,j,nmat) endif enddo enddo ! 100 format(' D',i1,' = ',e11.4) ! return end