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DAMASK_EICMD
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added acceleration capability after time-step cut backing

This commit is contained in:
Philip Eisenlohr 2008-02-21 10:33:34 +00:00
parent 9707fd0f8f
commit 9c1e8a7944
1 changed files with 19 additions and 9 deletions
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26
trunk/CPFEM.f90
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@ -91,8 +91,8 @@
return
END SUBROUTINE
!
!
!***********************************************************************
!*** perform initialization at first call, update variables and ***
!*** call the actual material model ***
@ -200,8 +200,8 @@
integer(pInt), parameter :: i_now = 1_pInt,i_then = 2_pInt
character(len=128) msg
integer(pInt) CPFEM_cn,cp_en,CPFEM_in,grain,i
logical updateJaco,error
integer(pInt) CPFEM_cn,cp_en,CPFEM_in,grain,i,max_cutbacks
logical updateJaco,error,cutback
real(pReal) CPFEM_dt,dt,t,volfrac,det
real(pReal), dimension(6) :: cs,Tstar_v
real(pReal), dimension(6,6) :: cd
@ -219,6 +219,7 @@
! -------------------------------------------
i = 0_pInt ! cutback counter
max_cutbacks = 0_pInt ! maximum depth of cut backing
dt = CPFEM_dt
state(:,i_now) = constitutive_state_old(:,grain,CPFEM_in,cp_en)
Fg(:,:,i_now) = CPFEM_ffn_all(:,:,CPFEM_in,cp_en)
@ -240,7 +241,7 @@
Fp(:,:,i_then) = Fp(:,:,i_now)
state(:,i_then) = 0.0_pReal ! state_old as initial guess
t = 0.0_pReal
cutback = .false. ! no cutback has happened so far
! ------- crystallite integration -----------
do
! -------------------------------------------
@ -257,11 +258,18 @@
Fg(:,:,i_now),Fg(:,:,i_then),Fp(:,:,i_now),state(:,i_now))
if (msg == 'ok') then ! solution converged
if (t == CPFEM_dt) then
debug_cutbackDistribution(i+1) = debug_cutbackDistribution(i+1)+1
debug_cutbackDistribution(max_cutbacks+1) = debug_cutbackDistribution(max_cutbacks+1)+1
exit ! reached final "then"
endif
if (cutback == .false.) then ! stable solution at current speed?
dt = 2.0_pReal*dt ! double time-step
i = i-1_pInt ! dec cutback counter
endif
cutback = .false. ! solution in next step does not derive from a cutback
else ! solution not found
i = i+1_pInt ! inc cutback counter
max_cutbacks = max(i,max_cutbacks)
cutback = .true.
if (i > nCutback) then ! limit exceeded?
debug_cutbackDistribution(nCutback+1) = debug_cutbackDistribution(nCutback+1)+1
write(6,'(x,a,x,i6,x,a,x,i2,x,a,x,i2)') 'element:',cp_en,'IP:',CPFEM_in,'grain:',grain
@ -333,7 +341,8 @@
use debug
use constitutive, only: constitutive_Nstatevars
use mesh, only: mesh_element
use math, only: math_Mandel6to33,math_Mandel33to6,math_Mandel3333to66,math_I3,math_det3x3,math_invert3x3
use math, only: math_Mandel6to33,math_Mandel33to6,math_Mandel3333to66,&
math_I3,math_det3x3,math_invert3x3
implicit none
character(len=*) msg
@ -354,7 +363,8 @@
tau = matmul(Fe_new,matmul(Tstar,transpose(Fe_new))) ! Kirchhoff stress
invJ = 1.0_pReal/math_det3x3(Fe_new) ! inverse dilatation of Fe
cs = math_Mandel33to6(invJ*tau) ! Cauchy stress
if (updateJaco) then ! consistent tangent using numerical perturbation of Fg (D.Tjahjanto Diss p.106)
if (updateJaco) then ! consistent tangent using
! numerical perturbation of Fg (D. Tjahjanto Diss p.106)
call math_invert3x3(Fp_new,invFp_new,det,error)
if (error) then
msg = 'inversion of Fp_new'