!-------------------------------------------------------------------------------------------------- !> @author Franz Roters, Max-Planck-Institut für Eisenforschung GmbH !> @author Philip Eisenlohr, Max-Planck-Institut für Eisenforschung GmbH !> @author David Cereceda, Lawrence Livermore National Laboratory !> @author Martin Diehl, Max-Planck-Institut für Eisenforschung GmbH !> @brief crystal plasticity model for bcc metals, especially Tungsten !-------------------------------------------------------------------------------------------------- module plastic_disloUCLA use prec use debug use math use IO use material use config use lattice use discretization use results implicit none private integer, dimension(:,:), allocatable, target, public :: & plastic_disloUCLA_sizePostResult !< size of each post result output character(len=64), dimension(:,:), allocatable, target, public :: & plastic_disloUCLA_output !< name of each post result output real(pReal), parameter, private :: & kB = 1.38e-23_pReal !< Boltzmann constant in J/Kelvin enum, bind(c) enumerator :: & undefined_ID, & rho_mob_ID, & rho_dip_ID, & dot_gamma_sl_ID, & gamma_sl_ID, & Lambda_sl_ID, & thresholdstress_ID end enum type, private :: tParameters real(pReal) :: & aTol_rho, & D, & !< grain size mu, & D_0, & !< prefactor for self-diffusion coefficient Q_cl !< activation energy for dislocation climb real(pReal), dimension(:), allocatable :: & rho_mob_0, & !< initial dislocation density rho_dip_0, & !< initial dipole density b_sl, & !< magnitude of burgers vector [m] nonSchmidCoeff, & D_a, & i_sl, & !< Adj. parameter for distance between 2 forest dislocations atomicVolume, & tau_0, & !* mobility law parameters delta_F, & !< activation energy for glide [J] v0, & !< dislocation velocity prefactor [m/s] p, & !< p-exponent in glide velocity q, & !< q-exponent in glide velocity B, & !< friction coefficient kink_height, & !< height of the kink pair w, & !< width of the kink pair omega !< attempt frequency for kink pair nucleation real(pReal), dimension(:,:), allocatable :: & h_sl_sl, & !< slip resistance from slip activity forestProjectionEdge real(pReal), dimension(:,:,:), allocatable :: & Schmid, & nonSchmid_pos, & nonSchmid_neg integer :: & sum_N_sl !< total number of active slip system integer, dimension(:), allocatable :: & N_sl !< number of active slip systems for each family integer(kind(undefined_ID)), dimension(:),allocatable :: & outputID !< ID of each post result output logical :: & dipoleFormation !< flag indicating consideration of dipole formation end type !< container type for internal constitutive parameters type, private :: tDisloUCLAState real(pReal), dimension(:,:), pointer :: & rho_mob, & rho_dip, & gamma_sl end type tDisloUCLAState type, private :: tDisloUCLAdependentState real(pReal), dimension(:,:), allocatable :: & Lambda_sl, & threshold_stress end type tDisloUCLAdependentState !-------------------------------------------------------------------------------------------------- ! containers for parameters and state type(tParameters), allocatable, dimension(:), private :: param type(tDisloUCLAState), allocatable, dimension(:), private :: & dotState, & state type(tDisloUCLAdependentState), allocatable, dimension(:), private :: dependentState public :: & plastic_disloUCLA_init, & plastic_disloUCLA_dependentState, & plastic_disloUCLA_LpAndItsTangent, & plastic_disloUCLA_dotState, & plastic_disloUCLA_postResults, & plastic_disloUCLA_results private :: & kinetics contains !-------------------------------------------------------------------------------------------------- !> @brief module initialization !> @details reads in material parameters, allocates arrays, and does sanity checks !-------------------------------------------------------------------------------------------------- subroutine plastic_disloUCLA_init() integer :: & Ninstance, & p, i, & NipcMyPhase, & sizeState, sizeDotState, & startIndex, endIndex integer, dimension(0), parameter :: emptyIntArray = [integer::] real(pReal), dimension(0), parameter :: emptyRealArray = [real(pReal)::] character(len=65536), dimension(0), parameter :: emptyStringArray = [character(len=65536)::] integer(kind(undefined_ID)) :: & outputID character(len=pStringLen) :: & extmsg = '' character(len=65536), dimension(:), allocatable :: & outputs write(6,'(/,a)') ' <<<+- plastic_'//PLASTICITY_DISLOUCLA_label//' init -+>>>' write(6,'(/,a)') ' Cereceda et al., International Journal of Plasticity 78:242–256, 2016' write(6,'(a)') ' https://dx.doi.org/10.1016/j.ijplas.2015.09.002' Ninstance = count(phase_plasticity == PLASTICITY_DISLOUCLA_ID) if (iand(debug_level(debug_constitutive),debug_levelBasic) /= 0) & write(6,'(a16,1x,i5,/)') '# instances:',Ninstance allocate(plastic_disloUCLA_sizePostResult(maxval(phase_Noutput),Ninstance),source=0) allocate(plastic_disloUCLA_output(maxval(phase_Noutput),Ninstance)) plastic_disloUCLA_output = '' allocate(param(Ninstance)) allocate(state(Ninstance)) allocate(dotState(Ninstance)) allocate(dependentState(Ninstance)) do p = 1, size(phase_plasticity) if (phase_plasticity(p) /= PLASTICITY_DISLOUCLA_ID) cycle associate(prm => param(phase_plasticityInstance(p)), & dot => dotState(phase_plasticityInstance(p)), & stt => state(phase_plasticityInstance(p)), & dst => dependentState(phase_plasticityInstance(p)), & config => config_phase(p)) !-------------------------------------------------------------------------------------------------- ! optional parameters that need to be defined prm%mu = lattice_mu(p) prm%aTol_rho = config%getFloat('atol_rho') ! sanity checks if (prm%aTol_rho <= 0.0_pReal) extmsg = trim(extmsg)//' atol_rho' !-------------------------------------------------------------------------------------------------- ! slip related parameters prm%N_sl = config%getInts('nslip',defaultVal=emptyIntArray) prm%sum_N_sl = sum(prm%N_sl) slipActive: if (prm%sum_N_sl > 0) then prm%Schmid = lattice_SchmidMatrix_slip(prm%N_sl,config%getString('lattice_structure'),& config%getFloat('c/a',defaultVal=0.0_pReal)) if(trim(config%getString('lattice_structure')) == 'bcc') then prm%nonSchmidCoeff = config%getFloats('nonschmid_coefficients',& defaultVal = emptyRealArray) prm%nonSchmid_pos = lattice_nonSchmidMatrix(prm%N_sl,prm%nonSchmidCoeff,+1) prm%nonSchmid_neg = lattice_nonSchmidMatrix(prm%N_sl,prm%nonSchmidCoeff,-1) else prm%nonSchmid_pos = prm%Schmid prm%nonSchmid_neg = prm%Schmid endif prm%h_sl_sl = lattice_interaction_SlipBySlip(prm%N_sl, & config%getFloats('interaction_slipslip'), & config%getString('lattice_structure')) prm%forestProjectionEdge = lattice_forestProjection(prm%N_sl,config%getString('lattice_structure'),& config%getFloat('c/a',defaultVal=0.0_pReal)) prm%rho_mob_0 = config%getFloats('rhoedge0', requiredSize=size(prm%N_sl)) prm%rho_dip_0 = config%getFloats('rhoedgedip0', requiredSize=size(prm%N_sl)) prm%v0 = config%getFloats('v0', requiredSize=size(prm%N_sl)) prm%b_sl = config%getFloats('slipburgers', requiredSize=size(prm%N_sl)) prm%delta_F = config%getFloats('qedge', requiredSize=size(prm%N_sl)) prm%i_sl = config%getFloats('clambdaslip', requiredSize=size(prm%N_sl)) prm%tau_0 = config%getFloats('tau_peierls', requiredSize=size(prm%N_sl)) prm%p = config%getFloats('p_slip', requiredSize=size(prm%N_sl), & defaultVal=[(1.0_pReal,i=1,size(prm%N_sl))]) prm%q = config%getFloats('q_slip', requiredSize=size(prm%N_sl), & defaultVal=[(1.0_pReal,i=1,size(prm%N_sl))]) prm%kink_height = config%getFloats('kink_height', requiredSize=size(prm%N_sl)) prm%w = config%getFloats('kink_width', requiredSize=size(prm%N_sl)) prm%omega = config%getFloats('omega', requiredSize=size(prm%N_sl)) prm%B = config%getFloats('friction_coeff', requiredSize=size(prm%N_sl)) prm%D = config%getFloat('grainsize') prm%D_0 = config%getFloat('d0') prm%Q_cl = config%getFloat('qsd') prm%atomicVolume = config%getFloat('catomicvolume') * prm%b_sl**3.0_pReal prm%D_a = config%getFloat('cedgedipmindistance') * prm%b_sl prm%dipoleformation = config%getFloat('dipoleformationfactor') > 0.0_pReal !should be on by default, ToDo: change to /key/-type key ! expand: family => system prm%rho_mob_0 = math_expand(prm%rho_mob_0, prm%N_sl) prm%rho_dip_0 = math_expand(prm%rho_dip_0, prm%N_sl) prm%q = math_expand(prm%q, prm%N_sl) prm%p = math_expand(prm%p, prm%N_sl) prm%delta_F = math_expand(prm%delta_F, prm%N_sl) prm%b_sl = math_expand(prm%b_sl, prm%N_sl) prm%kink_height = math_expand(prm%kink_height, prm%N_sl) prm%w = math_expand(prm%w, prm%N_sl) prm%omega = math_expand(prm%omega, prm%N_sl) prm%tau_0 = math_expand(prm%tau_0, prm%N_sl) prm%v0 = math_expand(prm%v0, prm%N_sl) prm%B = math_expand(prm%B, prm%N_sl) prm%i_sl = math_expand(prm%i_sl, prm%N_sl) prm%atomicVolume = math_expand(prm%atomicVolume, prm%N_sl) prm%D_a = math_expand(prm%D_a, prm%N_sl) ! sanity checks if ( prm%D_0 <= 0.0_pReal) extmsg = trim(extmsg)//' D_0' if ( prm%Q_cl <= 0.0_pReal) extmsg = trim(extmsg)//' Q_cl' if (any(prm%rho_mob_0 < 0.0_pReal)) extmsg = trim(extmsg)//' rhoedge0' if (any(prm%rho_dip_0 < 0.0_pReal)) extmsg = trim(extmsg)//' rhoedgedip0' if (any(prm%v0 < 0.0_pReal)) extmsg = trim(extmsg)//' v0' if (any(prm%b_sl <= 0.0_pReal)) extmsg = trim(extmsg)//' slipb_sl' if (any(prm%delta_F <= 0.0_pReal)) extmsg = trim(extmsg)//' qedge' if (any(prm%tau_0 < 0.0_pReal)) extmsg = trim(extmsg)//' tau_0' if (any(prm%D_a <= 0.0_pReal)) extmsg = trim(extmsg)//' cedgedipmindistance or slipb_sl' if (any(prm%atomicVolume <= 0.0_pReal)) extmsg = trim(extmsg)//' catomicvolume or slipb_sl' else slipActive allocate(prm%rho_mob_0(0)) allocate(prm%rho_dip_0(0)) endif slipActive !-------------------------------------------------------------------------------------------------- ! exit if any parameter is out of range if (extmsg /= '') & call IO_error(211,ext_msg=trim(extmsg)//'('//PLASTICITY_DISLOUCLA_label//')') !-------------------------------------------------------------------------------------------------- ! output pararameters outputs = config%getStrings('(output)',defaultVal=emptyStringArray) allocate(prm%outputID(0)) do i=1, size(outputs) outputID = undefined_ID select case(trim(outputs(i))) case ('edge_density') outputID = merge(rho_mob_ID,undefined_ID,prm%sum_N_sl>0) case ('dipole_density') outputID = merge(rho_dip_ID,undefined_ID,prm%sum_N_sl>0) case ('shear_rate','shearrate','shear_rate_slip','shearrate_slip') outputID = merge(dot_gamma_sl_ID,undefined_ID,prm%sum_N_sl>0) case ('accumulated_shear','accumulatedshear','accumulated_shear_slip') outputID = merge(gamma_sl_ID,undefined_ID,prm%sum_N_sl>0) case ('mfp','mfp_slip') outputID = merge(Lambda_sl_ID,undefined_ID,prm%sum_N_sl>0) case ('threshold_stress','threshold_stress_slip') outputID = merge(thresholdstress_ID,undefined_ID,prm%sum_N_sl>0) end select if (outputID /= undefined_ID) then plastic_disloUCLA_output(i,phase_plasticityInstance(p)) = outputs(i) plastic_disloUCLA_sizePostResult(i,phase_plasticityInstance(p)) = prm%sum_N_sl prm%outputID = [prm%outputID, outputID] endif enddo !-------------------------------------------------------------------------------------------------- ! allocate state arrays NipcMyPhase = count(material_phaseAt == p) * discretization_nIP sizeDotState = size(['rho_mob ','rho_dip ','gamma_sl']) * prm%sum_N_sl sizeState = sizeDotState call material_allocatePlasticState(p,NipcMyPhase,sizeState,sizeDotState,0, & prm%sum_N_sl,0,0) plasticState(p)%sizePostResults = sum(plastic_disloUCLA_sizePostResult(:,phase_plasticityInstance(p))) !-------------------------------------------------------------------------------------------------- ! locally defined state aliases and initialization of state0 and aTolState startIndex = 1 endIndex = prm%sum_N_sl stt%rho_mob=>plasticState(p)%state(startIndex:endIndex,:) stt%rho_mob= spread(prm%rho_mob_0,2,NipcMyPhase) dot%rho_mob=>plasticState(p)%dotState(startIndex:endIndex,:) plasticState(p)%aTolState(startIndex:endIndex) = prm%aTol_rho startIndex = endIndex + 1 endIndex = endIndex + prm%sum_N_sl stt%rho_dip=>plasticState(p)%state(startIndex:endIndex,:) stt%rho_dip= spread(prm%rho_dip_0,2,NipcMyPhase) dot%rho_dip=>plasticState(p)%dotState(startIndex:endIndex,:) plasticState(p)%aTolState(startIndex:endIndex) = prm%aTol_rho startIndex = endIndex + 1 endIndex = endIndex + prm%sum_N_sl stt%gamma_sl=>plasticState(p)%state(startIndex:endIndex,:) dot%gamma_sl=>plasticState(p)%dotState(startIndex:endIndex,:) plasticState(p)%aTolState(startIndex:endIndex) = 1.0e6_pReal ! Don't use for convergence check ! global alias plasticState(p)%slipRate => plasticState(p)%dotState(startIndex:endIndex,:) plasticState(p)%accumulatedSlip => plasticState(p)%state(startIndex:endIndex,:) allocate(dst%Lambda_sl(prm%sum_N_sl,NipcMyPhase), source=0.0_pReal) allocate(dst%threshold_stress(prm%sum_N_sl,NipcMyPhase), source=0.0_pReal) plasticState(p)%state0 = plasticState(p)%state ! ToDo: this could be done centrally end associate enddo end subroutine plastic_disloUCLA_init !-------------------------------------------------------------------------------------------------- !> @brief calculates plastic velocity gradient and its tangent !-------------------------------------------------------------------------------------------------- pure subroutine plastic_disloUCLA_LpAndItsTangent(Lp,dLp_dMp, & Mp,T,instance,of) real(pReal), dimension(3,3), intent(out) :: & Lp !< plastic velocity gradient real(pReal), dimension(3,3,3,3), intent(out) :: & dLp_dMp !< derivative of Lp with respect to the Mandel stress real(pReal), dimension(3,3), intent(in) :: & Mp !< Mandel stress real(pReal), intent(in) :: & T !< temperature integer, intent(in) :: & instance, & of integer :: & i,k,l,m,n real(pReal), dimension(param(instance)%sum_N_sl) :: & dot_gamma_pos,dot_gamma_neg, & ddot_gamma_dtau_pos,ddot_gamma_dtau_neg Lp = 0.0_pReal dLp_dMp = 0.0_pReal associate(prm => param(instance)) call kinetics(Mp,T,instance,of,dot_gamma_pos,dot_gamma_neg,ddot_gamma_dtau_pos,ddot_gamma_dtau_neg) do i = 1, prm%sum_N_sl Lp = Lp + (dot_gamma_pos(i)+dot_gamma_neg(i))*prm%Schmid(1:3,1:3,i) forall (k=1:3,l=1:3,m=1:3,n=1:3) & dLp_dMp(k,l,m,n) = dLp_dMp(k,l,m,n) & + ddot_gamma_dtau_pos(i) * prm%Schmid(k,l,i) * prm%nonSchmid_pos(m,n,i) & + ddot_gamma_dtau_neg(i) * prm%Schmid(k,l,i) * prm%nonSchmid_neg(m,n,i) enddo end associate end subroutine plastic_disloUCLA_LpAndItsTangent !-------------------------------------------------------------------------------------------------- !> @brief calculates the rate of change of microstructure !-------------------------------------------------------------------------------------------------- subroutine plastic_disloUCLA_dotState(Mp,T,instance,of) real(pReal), dimension(3,3), intent(in) :: & Mp !< Mandel stress real(pReal), intent(in) :: & T !< temperature integer, intent(in) :: & instance, & of real(pReal) :: & VacancyDiffusion real(pReal), dimension(param(instance)%sum_N_sl) :: & gdot_pos, gdot_neg,& tau_pos,& tau_neg, & v_cl, & dot_rho_dip_formation, & dot_rho_dip_climb, & dip_distance associate(prm => param(instance), stt => state(instance),dot => dotState(instance), dst => dependentState(instance)) call kinetics(Mp,T,instance,of,& gdot_pos,gdot_neg, & tau_pos_out = tau_pos,tau_neg_out = tau_neg) dot%gamma_sl(:,of) = (gdot_pos+gdot_neg) ! ToDo: needs to be abs VacancyDiffusion = prm%D_0*exp(-prm%Q_cl/(kB*T)) where(dEq0(tau_pos)) ! ToDo: use avg of pos and neg dot_rho_dip_formation = 0.0_pReal dot_rho_dip_climb = 0.0_pReal else where dip_distance = math_clip(3.0_pReal*prm%mu*prm%b_sl/(16.0_pReal*PI*abs(tau_pos)), & prm%D_a, & ! lower limit dst%Lambda_sl(:,of)) ! upper limit dot_rho_dip_formation = merge(2.0_pReal*dip_distance* stt%rho_mob(:,of)*abs(dot%gamma_sl(:,of))/prm%b_sl, & ! ToDo: ignore region of spontaneous annihilation 0.0_pReal, & prm%dipoleformation) v_cl = (3.0_pReal*prm%mu*VacancyDiffusion*prm%atomicVolume/(2.0_pReal*pi*kB*T)) & * (1.0_pReal/(dip_distance+prm%D_a)) dot_rho_dip_climb = (4.0_pReal*v_cl*stt%rho_dip(:,of))/(dip_distance-prm%D_a) ! ToDo: Discuss with Franz: Stress dependency? end where dot%rho_mob(:,of) = abs(dot%gamma_sl(:,of))/(prm%b_sl*dst%Lambda_sl(:,of)) & ! multiplication - dot_rho_dip_formation & - (2.0_pReal*prm%D_a)/prm%b_sl*stt%rho_mob(:,of)*abs(dot%gamma_sl(:,of)) ! Spontaneous annihilation of 2 single edge dislocations dot%rho_dip(:,of) = dot_rho_dip_formation & - (2.0_pReal*prm%D_a)/prm%b_sl*stt%rho_dip(:,of)*abs(dot%gamma_sl(:,of)) & ! Spontaneous annihilation of a single edge dislocation with a dipole constituent - dot_rho_dip_climb end associate end subroutine plastic_disloUCLA_dotState !-------------------------------------------------------------------------------------------------- !> @brief calculates derived quantities from state !-------------------------------------------------------------------------------------------------- subroutine plastic_disloUCLA_dependentState(instance,of) integer, intent(in) :: & instance, & of real(pReal), dimension(param(instance)%sum_N_sl) :: & dislocationSpacing integer :: & i associate(prm => param(instance), stt => state(instance),dst => dependentState(instance)) forall (i = 1:prm%sum_N_sl) & dislocationSpacing(i) = sqrt(dot_product(stt%rho_mob(:,of)+stt%rho_dip(:,of), & prm%forestProjectionEdge(:,i))) dst%threshold_stress(:,of) = prm%mu*prm%b_sl & * sqrt(matmul(prm%h_sl_sl,stt%rho_mob(:,of)+stt%rho_dip(:,of))) dst%Lambda_sl(:,of) = prm%D/(1.0_pReal+prm%D*dislocationSpacing/prm%i_sl) end associate end subroutine plastic_disloUCLA_dependentState !-------------------------------------------------------------------------------------------------- !> @brief return array of constitutive results !-------------------------------------------------------------------------------------------------- function plastic_disloUCLA_postResults(Mp,T,instance,of) result(postResults) real(pReal), dimension(3,3), intent(in) :: & Mp !< Mandel stress real(pReal), intent(in) :: & T !< temperature integer, intent(in) :: & instance, & of real(pReal), dimension(sum(plastic_disloUCLA_sizePostResult(:,instance))) :: & postResults integer :: & o,c real(pReal), dimension(param(instance)%sum_N_sl) :: & gdot_pos,gdot_neg c = 0 associate(prm => param(instance), stt => state(instance), dst => dependentState(instance)) outputsLoop: do o = 1,size(prm%outputID) select case(prm%outputID(o)) case (rho_mob_ID) postResults(c+1:c+prm%sum_N_sl) = stt%rho_mob(1:prm%sum_N_sl,of) case (rho_dip_ID) postResults(c+1:c+prm%sum_N_sl) = stt%rho_dip(1:prm%sum_N_sl,of) case (dot_gamma_sl_ID) call kinetics(Mp,T,instance,of,gdot_pos,gdot_neg) postResults(c+1:c+prm%sum_N_sl) = gdot_pos + gdot_neg case (gamma_sl_ID) postResults(c+1:c+prm%sum_N_sl) = stt%gamma_sl(1:prm%sum_N_sl, of) case (Lambda_sl_ID) postResults(c+1:c+prm%sum_N_sl) = dst%Lambda_sl(1:prm%sum_N_sl, of) case (thresholdstress_ID) postResults(c+1:c+prm%sum_N_sl) = dst%threshold_stress(1:prm%sum_N_sl,of) end select c = c + prm%sum_N_sl enddo outputsLoop end associate end function plastic_disloUCLA_postResults !-------------------------------------------------------------------------------------------------- !> @brief writes results to HDF5 output file !-------------------------------------------------------------------------------------------------- subroutine plastic_disloUCLA_results(instance,group) #if defined(PETSc) || defined(DAMASK_HDF5) integer, intent(in) :: instance character(len=*), intent(in) :: group integer :: o associate(prm => param(instance), stt => state(instance), dst => dependentState(instance)) outputsLoop: do o = 1,size(prm%outputID) select case(prm%outputID(o)) case (rho_mob_ID) call results_writeDataset(group,stt%rho_mob,'rho_mob',& 'mobile dislocation density','1/m²') case (rho_dip_ID) call results_writeDataset(group,stt%rho_dip,'rho_dip',& 'dislocation dipole density''1/m²') case (dot_gamma_sl_ID) call results_writeDataset(group,stt%gamma_sl,'dot_gamma_sl',& 'plastic shear','1') case (Lambda_sl_ID) call results_writeDataset(group,dst%Lambda_sl,'Lambda_sl',& 'mean free path for slip','m') case (thresholdstress_ID) call results_writeDataset(group,dst%threshold_stress,'threshold_stress',& 'threshold stress for slip','Pa') end select enddo outputsLoop end associate #else integer, intent(in) :: instance character(len=*), intent(in) :: group #endif end subroutine plastic_disloUCLA_results !-------------------------------------------------------------------------------------------------- !> @brief Shear rates on slip systems, their derivatives with respect to resolved stress and the ! resolved stresss !> @details Derivatives and resolved stress are calculated only optionally. ! NOTE: Against the common convention, the result (i.e. intent(out)) variables are the last to ! have the optional arguments at the end !-------------------------------------------------------------------------------------------------- pure subroutine kinetics(Mp,T,instance,of, & dot_gamma_pos,dot_gamma_neg,ddot_gamma_dtau_pos,ddot_gamma_dtau_neg,tau_pos_out,tau_neg_out) real(pReal), dimension(3,3), intent(in) :: & Mp !< Mandel stress real(pReal), intent(in) :: & T !< temperature integer, intent(in) :: & instance, & of real(pReal), intent(out), dimension(param(instance)%sum_N_sl) :: & dot_gamma_pos, & dot_gamma_neg real(pReal), intent(out), optional, dimension(param(instance)%sum_N_sl) :: & ddot_gamma_dtau_pos, & ddot_gamma_dtau_neg, & tau_pos_out, & tau_neg_out real(pReal), dimension(param(instance)%sum_N_sl) :: & StressRatio, & StressRatio_p,StressRatio_pminus1, & dvel, vel, & tau_pos,tau_neg, & t_n, t_k, dtk,dtn, & needsGoodName ! ToDo: @Karo: any idea? integer :: j associate(prm => param(instance), stt => state(instance), dst => dependentState(instance)) do j = 1, prm%sum_N_sl tau_pos(j) = math_mul33xx33(Mp,prm%nonSchmid_pos(1:3,1:3,j)) tau_neg(j) = math_mul33xx33(Mp,prm%nonSchmid_neg(1:3,1:3,j)) enddo if (present(tau_pos_out)) tau_pos_out = tau_pos if (present(tau_neg_out)) tau_neg_out = tau_neg associate(BoltzmannRatio => prm%delta_F/(kB*T), & dot_gamma_0 => stt%rho_mob(:,of)*prm%b_sl*prm%v0, & effectiveLength => dst%Lambda_sl(:,of) - prm%w) significantPositiveTau: where(abs(tau_pos)-dst%threshold_stress(:,of) > tol_math_check) StressRatio = (abs(tau_pos)-dst%threshold_stress(:,of))/prm%tau_0 StressRatio_p = StressRatio** prm%p StressRatio_pminus1 = StressRatio**(prm%p-1.0_pReal) needsGoodName = exp(-BoltzmannRatio*(1-StressRatio_p) ** prm%q) t_n = prm%b_sl/(needsGoodName*prm%omega*effectiveLength) t_k = effectiveLength * prm%B /(2.0_pReal*prm%b_sl*tau_pos) ! our definition of tk is different with the one in dislotwin vel = prm%kink_height/(t_n + t_k) dot_gamma_pos = dot_gamma_0 * sign(vel,tau_pos) * 0.5_pReal else where significantPositiveTau dot_gamma_pos = 0.0_pReal end where significantPositiveTau if (present(ddot_gamma_dtau_pos)) then significantPositiveTau2: where(abs(tau_pos)-dst%threshold_stress(:,of) > tol_math_check) dtn = -1.0_pReal * t_n * BoltzmannRatio * prm%p * prm%q * (1.0_pReal-StressRatio_p)**(prm%q - 1.0_pReal) & * (StressRatio)**(prm%p - 1.0_pReal) / prm%tau_0 dtk = -1.0_pReal * t_k / tau_pos dvel = -1.0_pReal * prm%kink_height * (dtk + dtn) / (t_n + t_k)**2.0_pReal ddot_gamma_dtau_pos = dot_gamma_0 * dvel* 0.5_pReal else where significantPositiveTau2 ddot_gamma_dtau_pos = 0.0_pReal end where significantPositiveTau2 endif significantNegativeTau: where(abs(tau_neg)-dst%threshold_stress(:,of) > tol_math_check) StressRatio = (abs(tau_neg)-dst%threshold_stress(:,of))/prm%tau_0 StressRatio_p = StressRatio** prm%p StressRatio_pminus1 = StressRatio**(prm%p-1.0_pReal) needsGoodName = exp(-BoltzmannRatio*(1-StressRatio_p) ** prm%q) t_n = prm%b_sl/(needsGoodName*prm%omega*effectiveLength) t_k = effectiveLength * prm%B /(2.0_pReal*prm%b_sl*tau_pos) ! our definition of tk is different with the one in dislotwin vel = prm%kink_height/(t_n + t_k) dot_gamma_neg = dot_gamma_0 * sign(vel,tau_neg) * 0.5_pReal else where significantNegativeTau dot_gamma_neg = 0.0_pReal end where significantNegativeTau if (present(ddot_gamma_dtau_neg)) then significantNegativeTau2: where(abs(tau_neg)-dst%threshold_stress(:,of) > tol_math_check) dtn = -1.0_pReal * t_n * BoltzmannRatio * prm%p * prm%q * (1.0_pReal-StressRatio_p)**(prm%q - 1.0_pReal) & * (StressRatio)**(prm%p - 1.0_pReal) / prm%tau_0 dtk = -1.0_pReal * t_k / tau_neg dvel = -1.0_pReal * prm%kink_height * (dtk + dtn) / (t_n + t_k)**2.0_pReal ddot_gamma_dtau_neg = dot_gamma_0 * dvel * 0.5_pReal else where significantNegativeTau2 ddot_gamma_dtau_neg = 0.0_pReal end where significantNegativeTau2 end if end associate end associate end subroutine kinetics end module plastic_disloUCLA