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variable cut back factor for Lp as suggested by Duancheng

This commit is contained in:
Martin Diehl 2017-04-26 19:18:47 +02:00
parent 92fefea3cc
commit 295bcd20f0
2 changed files with 32 additions and 28 deletions
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7
src/crystallite.f90
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@ -3374,8 +3374,7 @@ logical function crystallite_integrateStress(&
NiterationStressLp = 0_pInt
jacoCounterLp = 0_pInt
steplengthLp0 = 1.0_pReal
steplengthLp = steplengthLp0
steplengthLp = 1.0_pReal
residuumLp_old = 0.0_pReal
Lpguess_old = Lpguess
@ -3447,9 +3446,9 @@ logical function crystallite_integrateStress(&
.or. norm2(residuumLp) < norm2(residuumLp_old)) then ! not converged, but improved norm of residuum (always proceed in first iteration)...
residuumLp_old = residuumLp ! ...remember old values and...
Lpguess_old = Lpguess
steplengthLp = steplengthLp0 ! ...proceed with normal step length (calculate new search direction)
steplengthLp = 1.0_pReal ! ...proceed with normal step length (calculate new search direction)
else ! not converged and residuum not improved...
steplengthLp = 0.5_pReal * steplengthLp ! ...try with smaller step length in same direction
steplengthLp = subStepSizeLp * steplengthLp ! ...try with smaller step length in same direction
Lpguess = Lpguess_old + steplengthLp * deltaLp
cycle LpLoop
endif

5
src/numerics.f90
View File

@ -42,6 +42,7 @@ module numerics
subStepMinHomog = 1.0e-3_pReal, & !< minimum (relative) size of sub-step allowed during cutback in homogenization
subStepSizeCryst = 0.25_pReal, & !< size of first substep when cutback in crystallite
subStepSizeHomog = 0.25_pReal, & !< size of first substep when cutback in homogenization
subStepSizeLp = 0.5_pReal, & !< size of first substep when cutback in Lp calculation
stepIncreaseCryst = 1.5_pReal, & !< increase of next substep size when previous substep converged in crystallite
stepIncreaseHomog = 1.5_pReal, & !< increase of next substep size when previous substep converged in homogenization
rTol_crystalliteState = 1.0e-6_pReal, & !< relative tolerance in crystallite state loop
@ -295,6 +296,8 @@ subroutine numerics_init
subStepSizeCryst = IO_floatValue(line,chunkPos,2_pInt)
case ('stepincreasecryst')
stepIncreaseCryst = IO_floatValue(line,chunkPos,2_pInt)
case ('substepsizelp')
subStepSizeLp = IO_floatValue(line,chunkPos,2_pInt)
case ('substepminhomog')
subStepMinHomog = IO_floatValue(line,chunkPos,2_pInt)
case ('substepsizehomog')
@ -515,6 +518,7 @@ subroutine numerics_init
write(6,'(a24,1x,es8.1)') ' subStepMinCryst: ',subStepMinCryst
write(6,'(a24,1x,es8.1)') ' subStepSizeCryst: ',subStepSizeCryst
write(6,'(a24,1x,es8.1)') ' stepIncreaseCryst: ',stepIncreaseCryst
write(6,'(a24,1x,es8.1)') ' subStepSizeLp: ',subStepSizeLp
write(6,'(a24,1x,i8)') ' nState: ',nState
write(6,'(a24,1x,i8)') ' nStress: ',nStress
write(6,'(a24,1x,es8.1)') ' rTol_crystalliteState: ',rTol_crystalliteState
@ -643,6 +647,7 @@ subroutine numerics_init
if (subStepMinCryst <= 0.0_pReal) call IO_error(301_pInt,ext_msg='subStepMinCryst')
if (subStepSizeCryst <= 0.0_pReal) call IO_error(301_pInt,ext_msg='subStepSizeCryst')
if (stepIncreaseCryst <= 0.0_pReal) call IO_error(301_pInt,ext_msg='stepIncreaseCryst')
if (subStepSizeLp <= 0.0_pReal) call IO_error(301_pInt,ext_msg='subStepSizeLp')
if (subStepMinHomog <= 0.0_pReal) call IO_error(301_pInt,ext_msg='subStepMinHomog')
if (subStepSizeHomog <= 0.0_pReal) call IO_error(301_pInt,ext_msg='subStepSizeHomog')
if (stepIncreaseHomog <= 0.0_pReal) call IO_error(301_pInt,ext_msg='stepIncreaseHomog')