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introduced material parameter "linetension", which indicates how strong the effect of the line tension on the hardening coefficients is

This commit is contained in:
Christoph Kords 2012-10-05 14:42:41 +00:00
parent 7cc6108a04
commit 40a2e652e7
2 changed files with 13 additions and 2 deletions
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1
code/config/material.config
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@ -295,6 +295,7 @@ maximumVelocity 3600 # maximum allowed velocity
surfaceTransmissivity 1.0 # transmissivity of free surfaces for dislocation flux
grainboundaryTransmissivity 0.0 # transmissivity of grain boundaries for dislocation flux (grain bundaries are identified as interfaces with different textures on both sides); if not set or set to negative number, the subroutine automatically determines the transmissivity at the grain boundary
interaction_SlipSlip 0 0 0.625 0.07 0.137 0.122 # Dislocation interaction coefficient
linetension 0 # constant indicating the effect of the line tension on the hardening coefficients (0 to 1)
shortRangeStressCorrection 0 # switch for use of short range correction stress
cutoffRadius 1e-3 # cutoff radius for dislocation stress in m
CFLfactor 2.0 # safety factor for CFL flux check (numerical parameter)

14
code/constitutive_nonlocal.f90
View File

@ -133,7 +133,8 @@ constitutive_nonlocal_grainboundaryTransmissivity, & ! transmiss
constitutive_nonlocal_CFLfactor, & ! safety factor for CFL flux condition
constitutive_nonlocal_fEdgeMultiplication, & ! factor that determines how much edge dislocations contribute to multiplication (0...1)
constitutive_nonlocal_rhoSglRandom, &
constitutive_nonlocal_rhoSglRandomBinning
constitutive_nonlocal_rhoSglRandomBinning, &
constitutive_nonlocal_linetensionEffect
real(pReal), dimension(:,:), allocatable, private :: &
constitutive_nonlocal_rhoSglEdgePos0, & ! initial edge_pos dislocation density per slip system for each family and instance
@ -345,6 +346,7 @@ allocate(constitutive_nonlocal_grainboundaryTransmissivity(maxNinstance))
allocate(constitutive_nonlocal_shortRangeStressCorrection(maxNinstance))
allocate(constitutive_nonlocal_CFLfactor(maxNinstance))
allocate(constitutive_nonlocal_fEdgeMultiplication(maxNinstance))
allocate(constitutive_nonlocal_linetensionEffect(maxNinstance))
constitutive_nonlocal_CoverA = 0.0_pReal
constitutive_nonlocal_C11 = 0.0_pReal
constitutive_nonlocal_C12 = 0.0_pReal
@ -378,6 +380,7 @@ constitutive_nonlocal_surfaceTransmissivity = 1.0_pReal
constitutive_nonlocal_grainboundaryTransmissivity = -1.0_pReal
constitutive_nonlocal_CFLfactor = 2.0_pReal
constitutive_nonlocal_fEdgeMultiplication = 0.0_pReal
constitutive_nonlocal_linetensionEffect = 0.0_pReal
constitutive_nonlocal_shortRangeStressCorrection = .true.
allocate(constitutive_nonlocal_rhoSglEdgePos0(lattice_maxNslipFamily,maxNinstance))
@ -496,6 +499,8 @@ do
case ('interaction_slipslip')
forall (it = 1_pInt:lattice_maxNinteraction) &
constitutive_nonlocal_interactionSlipSlip(it,i) = IO_floatValue(line,positions,1_pInt+it)
case('linetension','linetensioneffect','linetension_effect')
constitutive_nonlocal_linetensionEffect(i) = IO_floatValue(line,positions,2_pInt)
case('peierlsstressedge','peierlsstress_edge')
forall (f = 1_pInt:lattice_maxNslipFamily) &
constitutive_nonlocal_peierlsStressPerSlipFamily(f,1_pInt,i) = IO_floatValue(line,positions,1_pInt+f)
@ -593,6 +598,9 @@ enddo
if (any(constitutive_nonlocal_interactionSlipSlip(1:maxval(lattice_interactionSlipSlip(:,:,myStructure)),i) < 0.0_pReal)) &
call IO_error(211_pInt,ext_msg='interaction_SlipSlip (' &
//constitutive_nonlocal_label//')')
if (constitutive_nonlocal_linetensionEffect(i) < 0.0_pReal .or. constitutive_nonlocal_linetensionEffect(i) > 1.0_pReal) &
call IO_error(211_pInt,ext_msg='linetension (' &
//constitutive_nonlocal_label//')')
if (constitutive_nonlocal_R(i) < 0.0_pReal) call IO_error(211_pInt,ext_msg='r (' &
//constitutive_nonlocal_label//')')
if (constitutive_nonlocal_atomicVolume(i) <= 0.0_pReal) call IO_error(211_pInt,ext_msg='atomicVolume (' &
@ -1255,7 +1263,9 @@ forall (s = 1_pInt:ns) &
if (latticeStruct == 1_pInt) then ! in case of fcc: coefficients are corrected for the line tension effect (see Kubin,Devincre,Hoc; 2008; Modeling dislocation storage rates and mean free paths in face-centered cubic crystals)
do s = 1_pInt,ns
myRhoForest = max(rhoForest(s),constitutive_nonlocal_significantRho(instance))
correction = ( log(0.35_pReal * constitutive_nonlocal_burgers(s,instance) * sqrt(myRhoForest)) &
correction = ( 1.0_pReal - constitutive_nonlocal_linetensionEffect(instance) &
+ constitutive_nonlocal_linetensionEffect(instance) &
* log(0.35_pReal * constitutive_nonlocal_burgers(s,instance) * sqrt(myRhoForest)) &
/ log(0.35_pReal * constitutive_nonlocal_burgers(s,instance) * 1e6_pReal)) ** 2.0_pReal
do s2 = 1_pInt,ns
interactionCoefficient = lattice_interactionSlipSlip(constitutive_nonlocal_slipSystemLattice(s,instance), &