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DAMASK_EICMD
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changed quite a few things, mainly using last result as initial guess now, thinks work a lot better now but still not perfect

This commit is contained in:
Franz Roters 2007-06-06 14:38:06 +00:00
parent 0efe7756bc
commit a1c3df84ab
2 changed files with 12 additions and 10 deletions
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18
trunk/CPFEM.f90
View File

@ -180,7 +180,7 @@
deltaFg = CPFEM_ffn1_all(:,:,CPFEM_in,cp_en)-CPFEM_ffn_all(:,:,CPFEM_in,cp_en)
dt = CPFEM_dt
Tstar_v = 0.0_pReal ! fully elastic initial guess
Tstar_v = CPFEM_sigma_old(:,grain,CPFEM_in,cp_en) ! use last result as initial guess
Fg(:,:,i_then) = Fg(:,:,i_now)
state(:,i_then) = 0.0_pReal ! state_old as initial guess
t = 0.0_pReal
@ -369,8 +369,8 @@
if (all(state_new == 0.0_pReal)) state_new = state_old
RstateS = state_new
iState = 0_pInt
! fully elastic guess (Lp = 0), if none specified
if (all(Tstar_v == 0.0_pReal)) Tstar_v = 0.5_pReal*matmul(C_66,math_Mandel33to6(A-math_I3))
! fully elastic guess (Lp = 0), if none specified, however somewhat reduced ie. 0.3 instead of 0.5
if (all(Tstar_v == 0.0_pReal)) Tstar_v = 0.3_pReal*matmul(C_66,math_Mandel33to6(A-math_I3))
! QUESTION follow former plastic slope to guess better?
Rstress = Tstar_v
@ -407,12 +407,12 @@ stress: do ! inner iteration: stress
enddo
enddo
enddo
Jacobi = math_identity2nd(6) + 0.5_pReal*dt*matmul(C_66,math_Mandel3333to66(LTL))
j = 0_pInt ; failed = .true.
j = 0_pInt
call math_invert6x6(Jacobi,invJacobi,dummy,failed)
do while (failed .and. j <= nReg)
call math_invert6x6(Jacobi,invJacobi,dummy,failed)
forall (i=1:6) Jacobi(i,i) = 1.05_pReal*maxval(Jacobi(i,:)) ! regularization
call math_invert6x6(Jacobi,invJacobi,dummy,failed)
j = j+1
enddo
if (failed) then
@ -426,16 +426,18 @@ stress: do ! inner iteration: stress
Tstar_v = Tstar_v-dTstar_v
enddo stress
! write(6,*) 'istress', istress
Tstar_v = 0.5_pReal*matmul(C_66,math_Mandel33to6(matmul(transpose(B),AB)-math_I3))
dstate = dt*constitutive_dotState(Tstar_v,state_new,grain,CPFEM_in,cp_en) ! evolution of microstructure
Rstate = state_new - (state_old+dstate)
RstateS = 0.0_pReal
forall (i=1:constitutive_Nstatevars(grain,CPFEM_in,cp_en), state_new(i)/=0.0_pReal) &
RstateS(i) = Rstate(i)/state_new(i)
if (maxval(abs(RstateS)) < tol_State) exit state
state_new = state_old+dstate
if (maxval(abs(RstateS)) < tol_State) exit state
enddo state
! write(6,*) 'istate', istate
invFp_new = matmul(invFp_old,B)
call math_invert3x3(invFp_new,Fp_new,det,failed)

4
trunk/prec.f90
View File

@ -19,11 +19,11 @@
! *** Maximum number of iterations in outer (state variables) loop ***
integer(pInt), parameter :: nState = 50_pInt
! *** Convergence criteria for outer (state variables) loop ***
real(pReal), parameter :: tol_State = 1.0e-4_pReal
real(pReal), parameter :: tol_State = 1.0e-6_pReal
! *** Maximum number of iterations in inner (stress) loop ***
integer(pInt), parameter :: nStress = 2000_pInt
! *** Convergence criteria for inner (stress) loop ***
real(pReal), parameter :: tol_Stress = 1.0e-3_pReal
real(pReal), parameter :: tol_Stress = 1.0e-6_pReal
! *** Factor for maximum stress correction in inner (stress) loop ***
real(pReal), parameter :: crite = 1.0e-1_pReal