diff --git a/code/config/material.config b/code/config/material.config index 5ec3efec5..eb3d10827 100644 --- a/code/config/material.config +++ b/code/config/material.config @@ -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) diff --git a/code/constitutive_nonlocal.f90 b/code/constitutive_nonlocal.f90 index 71ec292bc..3801809f4 100644 --- a/code/constitutive_nonlocal.f90 +++ b/code/constitutive_nonlocal.f90 @@ -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), &