crystallite: restoration of last known good Lp_guess
CPFEM_Taylor: exit whenever cutback limit exceeded
This commit is contained in:
Luc Hantcherli
parent
cdb2dd8808
commit
9626c25bfb
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@ -250,6 +250,13 @@
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CPFEM_Temperature(CPFEM_in,cp_en),&
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CPFEM_ffn1_bar(:,:,CPFEM_in,cp_en),CPFEM_ffn_bar(:,:,CPFEM_in,cp_en),&
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CPFEM_Fp_old(:,:,grain,CPFEM_in,cp_en),constitutive_state_old(:,grain,CPFEM_in,cp_en))
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if (msg /= 'ok') then ! solution not reached --> exit
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write(6,*) 'grain loop failed to converge @ EL:',cp_en,' IP:',CPFEM_in
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call IO_error(600)
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return
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endif
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volfrac = constitutive_matVolFrac(grain,CPFEM_in,cp_en)*constitutive_texVolFrac(grain,CPFEM_in,cp_en)
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CPFEM_PK1_bar(:,:,CPFEM_in,cp_en) = CPFEM_PK1_bar(:,:,CPFEM_in,cp_en) + volfrac*PK1
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if (updateJaco) CPFEM_dPdF_bar(:,:,:,:,CPFEM_in,cp_en) = &
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@ -89,19 +89,21 @@ CONTAINS
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state_new = state_bestguess ! try best available guess for state
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call TimeIntegration(msg,Lp,Fp_new,Fe_new,P,state_new,post_results,.true., & ! def gradients and PK2 at end of time step
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dt_aim,cp_en,ip,grain,Temperature,Fg_aim,Fp_current,state_current,0)
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dt_aim,cp_en,ip,grain,Temperature,Fg_aim,Fp_current,state_current,0_pInt)
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!
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if (msg == 'ok') then
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cuttedBack = .false. ! no cut back required
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guessNew = .false. ! keep the Lp
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subFrac = subFrac + subStep
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subStep = 1.0_pReal - subFrac ! try one go
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if (debugger) write (6,*) '--------- one go -----------++##'
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else
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nCutbacks = nCutbacks + 1 ! record additional cutback
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cuttedBack = .true. ! encountered problems -->
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guessNew = .true. ! redo plastic Lp guess
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subStep = subStep / 2.0_pReal ! cut time step in half
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state_bestguess = state_current ! current state is then best guess
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if (debugger) write (6,*) '>>>>>>>>>>>>>>>>>>>> cutback <<<<<<<<<<<<<<<<<<<<<<'
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endif
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enddo ! potential substepping
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!
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@ -116,7 +118,7 @@ CONTAINS
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Lp_pert = Lp
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state_pert = state_new ! initial guess from end of time step
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call TimeIntegration(msg,Lp_pert,Fp_pert,Fe_pert,P_pert,state_pert,post_results,.false., & ! def gradients and PK2 at end of time step
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dt_aim,cp_en,ip,grain,Temperature,Fg_pert,Fp_current,state_current,1)
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dt_aim,cp_en,ip,grain,Temperature,Fg_pert,Fp_current,state_current,1_pInt)
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if (msg == 'ok') &
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dPdF(:,:,k,l) = (P_pert-P)/pert_Fg ! constructing tangent dP_ij/dFg_kl only if valid forward difference
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! otherwise leave component unchanged
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@ -159,6 +161,7 @@ CONTAINS
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constitutive_homogenizedC,constitutive_dotState,constitutive_LpAndItsTangent,&
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constitutive_Nresults,constitutive_Microstructure,constitutive_post_results
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use math
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use IO
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implicit none
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!
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character(len=*) msg
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@ -205,6 +208,8 @@ Outer: do ! outer iteration: State
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iInner = 0_pInt
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leapfrog = 1.0_pReal ! correction as suggested by invdRdLp-step
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maxleap = 1024.0_pReal ! preassign maximum acceleration level
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Lpguess_old = Lpguess ! consider present Lpguess good
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!
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Inner: do ! inner iteration: Lp
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iInner = iInner+1
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@ -225,9 +230,11 @@ Inner: do ! inner iteration: Lp
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call constitutive_LpAndItsTangent(Lp,dLp, &
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Tstar_v,state,Temperature,grain,ip,cp_en)
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Rinner = Lpguess - Lp ! update current residuum
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if (not(any(Rinner.NE.Rinner)) .and. & ! exclude all NaN in residuum
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if (not(any(Rinner.NE.Rinner)) .and. & ! exclude any NaN in residuum
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( (maxval(abs(Rinner)) < abstol_Inner) .or. & ! below abs tol .or.
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( any(abs(dt*Lpguess) > relevantStrain) .and. & ! worth checking? .and.
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maxval(abs(Rinner/Lpguess),abs(dt*Lpguess) > relevantStrain) < reltol_Inner & ! below rel tol
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@ -237,13 +244,19 @@ Inner: do ! inner iteration: Lp
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exit Inner ! convergence
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!
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! check for acceleration/deceleration in Newton--Raphson correction
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if (leapfrog > 1.0_pReal .and. &
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if (any(Rinner.NE.Rinner) .and. & ! NaN occured at regular speed
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leapfrog == 1.0) then
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Lpguess = Lpguess_old ! restore known good guess
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msg = 'NaN present' ! croak for cutback
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return
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elseif (leapfrog > 1.0_pReal .and. & ! at fast pace ?
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(sum(Rinner*Rinner) > sum(Rinner_old*Rinner_old) .or. & ! worse residuum
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sum(Rinner*Rinner_old) < 0.0_pReal) .or. & ! residuum changed sign (overshoot)
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any(Rinner.NE.Rinner) ) then ! NaN
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maxleap = 0.5_pReal * leapfrog ! limit next acceleration
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leapfrog = 1.0_pReal ! grinding halt
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! if (debugger) write(6,*) 'grinding HALT'
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else ! better residuum
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dTdLp = 0.0_pReal ! calc dT/dLp
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forall (i=1:3,j=1:3,k=1:3,l=1:3,m=1:3,n=1:3) &
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@ -260,7 +273,8 @@ Inner: do ! inner iteration: Lp
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!
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Rinner_old = Rinner ! remember current residuum
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Lpguess_old = Lpguess ! remember current Lp guess
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if (iInner > 1 .and. leapfrog < maxleap) leapfrog = 2.0_pReal * leapfrog ! accelerate
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if (iInner > 1 .and. leapfrog < maxleap) &
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leapfrog = 2.0_pReal * leapfrog ! accelerate if ok
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endif
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!
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Lpguess = Lpguess_old ! start from current guess
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