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DAMASK_EICMD
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Make use of average consistent tangent dPdF_bar to fill eventual holes in the individual dPdF of one orientation (during consistent tangent calculation)

This commit is contained in:
Luc Hantcherli 2008-04-11 13:04:25 +00:00
parent 664a29c183
commit fa2d6b9b6d
2 changed files with 53 additions and 24 deletions
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17
trunk/CPFEM_Taylor.f90
View File

@ -232,13 +232,16 @@
real(pReal), dimension(3,3) :: PK1_pert,F1_pert
real(pReal), dimension(3,3) :: U,R,Fe1
real(pReal), dimension(3,3) :: PK1
real(pReal), dimension(3,3,3,3) :: dPdF
real(pReal), dimension(3,3,3,3) :: dPdF,dPdF_bar_old
!
CPFEM_PK1_bar(:,:,CPFEM_in,cp_en) = 0.0_pReal ! zero out average first PK stress
if (updateJaco) CPFEM_dPdF_bar(:,:,:,:,CPFEM_in,cp_en) = 0.0_pReal ! zero out average consistent tangent
if (updateJaco) then
dPdF_bar_old = CPFEM_dPdF_bar(:,:,:,:,CPFEM_in,cp_en) ! remember former average consistent tangent
CPFEM_dPdF_bar(:,:,:,:,CPFEM_in,cp_en) = 0.0_pReal ! zero out avg consistent tangent for later assembly
endif
do grain = 1,texture_Ngrains(mesh_element(4,cp_en))
volfrac = constitutive_matVolFrac(grain,CPFEM_in,cp_en)*constitutive_texVolFrac(grain,CPFEM_in,cp_en)
dPdF = dPdF_bar_old ! preguess consistent tangent of grain with avg
call SingleCrystallite(msg,PK1,dPdF,&
CPFEM_results(5:4+constitutive_Nresults(grain,CPFEM_in,cp_en),grain,CPFEM_in,cp_en),&
CPFEM_Fp_new(:,:,grain,CPFEM_in,cp_en),Fe1,constitutive_state_new(:,grain,CPFEM_in,cp_en),& ! output up to here
@ -246,9 +249,13 @@
CPFEM_Temperature(CPFEM_in,cp_en),&
CPFEM_ffn1_bar(:,:,CPFEM_in,cp_en),CPFEM_ffn_bar(:,:,CPFEM_in,cp_en),&
CPFEM_Fp_old(:,:,grain,CPFEM_in,cp_en),constitutive_state_old(:,grain,CPFEM_in,cp_en))
!
volfrac = constitutive_matVolFrac(grain,CPFEM_in,cp_en)*constitutive_texVolFrac(grain,CPFEM_in,cp_en)
CPFEM_PK1_bar(:,:,CPFEM_in,cp_en) = CPFEM_PK1_bar(:,:,CPFEM_in,cp_en) + volfrac*PK1
if (updateJaco) CPFEM_dPdF_bar(:,:,:,:,CPFEM_in,cp_en) = CPFEM_dPdF_bar(:,:,:,:,CPFEM_in,cp_en) + volfrac*dPdF
if (updateJaco) CPFEM_dPdF_bar(:,:,:,:,CPFEM_in,cp_en) = &
CPFEM_dPdF_bar(:,:,:,:,CPFEM_in,cp_en) + volfrac*dPdF ! add up crystallite stiffnesses
! (may have "holes" corresponding
! to former avg tangent)
!
! update results plotted in MENTAT
call math_pDecomposition(Fe1,U,R,error) ! polar decomposition

38
trunk/crystallite.f90
View File

@ -53,7 +53,8 @@ CONTAINS
real(pReal), dimension(3,3) :: Fe_old,Fe_current,Fe_new,Fe_pert
real(pReal), dimension(3,3) :: Tstar,tau,P,P_pert
real(pReal), dimension(3,3,3,3) :: dPdF
real(pReal), dimension(constitutive_Nstatevars(grain,ip,cp_en)) :: state_old,state_current,state_new,state_pert
real(pReal), dimension(constitutive_Nstatevars(grain,ip,cp_en)) :: state_old,state_new
real(pReal), dimension(constitutive_Nstatevars(grain,ip,cp_en)) :: state_current,state_bestguess,state_pert
real(pReal), dimension(constitutive_Nresults(grain,ip,cp_en)) :: post_results
!
deltaFg = Fg_new-Fg_old
@ -65,6 +66,7 @@ CONTAINS
Fp_new = Fp_old
call math_invert3x3(Fp_old,inv,det,error)
Fe_new = matmul(Fg_old,inv)
state_bestguess = state_new ! remember potentially available state guess
state_new = state_old
!
cuttedBack = .false.
@ -89,6 +91,7 @@ CONTAINS
else
Lp = 0.0_pReal ! fully elastic guess
endif
state_new = state_bestguess ! try best available guess for state
endif
call TimeIntegration(msg,Lp,Fp_new,Fe_new,P,state_new,post_results,.true., & ! def gradients and PK2 at end of time step
dt_aim,cp_en,ip,grain,Temperature,Fg_aim,Fp_current,state_current)
@ -103,6 +106,7 @@ CONTAINS
cuttedBack = .true. ! encountered problems -->
guessNew = .true. ! redo plastic Lp guess
subStep = subStep / 2.0_pReal ! cut time step in half
state_bestguess = state_current ! current state is then best guess
endif
enddo ! potential substepping
!
@ -118,12 +122,8 @@ CONTAINS
state_pert = state_new ! initial guess from end of time step
call TimeIntegration(msg,Lp,Fp_pert,Fe_pert,P_pert,state_pert,post_results,.false., & ! def gradients and PK2 at end of time step
dt_aim,cp_en,ip,grain,Temperature,Fg_pert,Fp_current,state_current)
if (msg /= 'ok') then
write(6,*)'killed myself at component',k,l
msg = 'consistent tangent --> '//msg
return
endif
dPdF(:,:,k,l) = (P_pert-P)/pert_Fg ! constructing the tangent dP_ij/dFg_kl from forward differences
if (msg == 'ok') &
dPdF(:,:,k,l) = (P_pert-P)/pert_Fg ! constructing tangent dP_ij/dFg_kl only if valid forward difference
enddo
enddo
endif
@ -217,6 +217,14 @@ Inner: do ! inner iteration: Lp
debug_InnerLoopDistribution(nInner) = debug_InnerLoopDistribution(nInner)+1
return
endif
! if (debugger) then
! write (6,*) iInner,iOuter
!write (6,'(a,/,9(9(e9.3,x)/))') 'dRdLp', dRdLp(1:9,:)
! write (6,'(a,/,3(3(e9.3,x)/))') 'Lpguess',Lpguess(1:3,:)
! write (6,*) 'state',state
! endif
B = math_i3 - dt*Lpguess
BT = transpose(B)
AB = matmul(A,B)
@ -227,7 +235,18 @@ Inner: do ! inner iteration: Lp
forall(i=1:3) Tstar_v(i) = Tstar_v(i)-p_hydro ! subtract hydrostatic pressure
call constitutive_LpAndItsTangent(Lp,dLp, &
Tstar_v,state,Temperature,grain,ip,cp_en)
! if (debugger) then
! write (6,'(a,/,6(f9.3,x))') 'Tstar[MPa]',1.0e-6_pReal*Tstar_v
! write (6,'(a,/,3(3(e9.3,x)/))') 'Lp',Lp(1:3,:)
! write (6,'(a,/,9(9(e9.3,x)/))') 'dLp', dLp(1:9,:)
! endif
Rinner = Lpguess - Lp ! update current residuum
! if (debugger) then
! write (6,'(a,/,3(3(e9.3,x)/))') 'Rinner',Rinner(1:3,:)
! endif
if ((maxval(abs(Rinner)) < abstol_Inner) .or. &
(any(abs(dt*Lpguess) > relevantStrain) .and. &
maxval(abs(Rinner/Lpguess),abs(dt*Lpguess) > relevantStrain) < reltol_Inner)) &
@ -236,9 +255,11 @@ Inner: do ! inner iteration: Lp
! check for acceleration/deceleration in Newton--Raphson correction
if (leapfrog > 1.0_pReal .and. &
(sum(Rinner*Rinner) > sum(Rinner_old*Rinner_old) .or. & ! worse residuum
sum(Rinner*Rinner_old) < 0.0_pReal)) then ! residuum changed sign (overshoot)
sum(Rinner*Rinner_old) < 0.0_pReal) .or. & ! residuum changed sign (overshoot)
any(Rinner /= Rinner) ) then ! NaN
maxleap = 0.5_pReal * leapfrog ! limit next acceleration
leapfrog = 1.0_pReal ! grinding halt
! if (debugger) write(6,*) 'grinding HALT'
else ! better residuum
dTdLp = 0.0_pReal ! calc dT/dLp
forall (i=1:3,j=1:3,k=1:3,l=1:3,m=1:3,n=1:3) &
@ -263,6 +284,7 @@ Inner: do ! inner iteration: Lp
Rinner_old = Rinner ! remember current residuum
Lpguess_old = Lpguess ! remember current Lp guess
if (iInner > 1 .and. leapfrog < maxleap) leapfrog = 2.0_pReal * leapfrog ! accelerate
! if (debugger) write(6,*) 'leapfrogging at',leapfrog
endif
!
Lpguess = Lpguess_old ! start from current guess