!-------------------------------------------------------------------------------------------------- !> @author Martin Diehl, Max-Planck-Institut für Eisenforschung GmbH !> @author Su Leen Wong, Max-Planck-Institut für Eisenforschung GmbH !> @author Nan Jia, Max-Planck-Institut für Eisenforschung GmbH !> @author Franz Roters, Max-Planck-Institut für Eisenforschung GmbH !> @author Philip Eisenlohr, Max-Planck-Institut für Eisenforschung GmbH !> @brief material subroutine incoprorating dislocation and twinning physics !> @details to be done !-------------------------------------------------------------------------------------------------- submodule(phase:plastic) dislotwin real(pReal), parameter :: & kB = 1.38e-23_pReal !< Boltzmann constant in J/Kelvin type :: tParameters real(pReal) :: & mu = 1.0_pReal, & !< equivalent shear modulus nu = 1.0_pReal, & !< equivalent shear Poisson's ratio Q_cl = 1.0_pReal, & !< activation energy for dislocation climb omega = 1.0_pReal, & !< frequency factor for dislocation climb D = 1.0_pReal, & !< grain size p_sb = 1.0_pReal, & !< p-exponent in shear band velocity q_sb = 1.0_pReal, & !< q-exponent in shear band velocity i_tw = 1.0_pReal, & !< adjustment parameter to calculate MFP for twinning L_tw = 1.0_pReal, & !< Length of twin nuclei in Burgers vectors L_tr = 1.0_pReal, & !< Length of trans nuclei in Burgers vectors x_c_tw = 1.0_pReal, & !< critical distance for formation of twin nucleus x_c_tr = 1.0_pReal, & !< critical distance for formation of trans nucleus V_cs = 1.0_pReal, & !< cross slip volume xi_sb = 1.0_pReal, & !< value for shearband resistance v_sb = 1.0_pReal, & !< value for shearband velocity_0 E_sb = 1.0_pReal, & !< activation energy for shear bands delta_G = 1.0_pReal, & !< Free energy difference between austensite and martensite i_tr = 1.0_pReal, & !< adjustment parameter to calculate MFP for transformation h = 1.0_pReal, & !< Stack height of hex nucleus T_ref = 0.0_pReal real(pReal), dimension(2) :: & Gamma_sf = 0.0_pReal real(pReal), allocatable, dimension(:) :: & b_sl, & !< absolute length of Burgers vector [m] for each slip system b_tw, & !< absolute length of Burgers vector [m] for each twin system b_tr, & !< absolute length of Burgers vector [m] for each transformation system Q_sl,& !< activation energy for glide [J] for each slip system v_0, & !< dislocation velocity prefactor [m/s] for each slip system dot_N_0_tw, & !< twin nucleation rate [1/m³s] for each twin system dot_N_0_tr, & !< trans nucleation rate [1/m³s] for each trans system t_tw, & !< twin thickness [m] for each twin system i_sl, & !< Adj. parameter for distance between 2 forest dislocations for each slip system t_tr, & !< martensite lamellar thickness [m] for each trans system p, & !< p-exponent in glide velocity q, & !< q-exponent in glide velocity r, & !< r-exponent in twin nucleation rate s, & !< s-exponent in trans nucleation rate tau_0, & !< strength due to elements in solid solution gamma_char, & !< characteristic shear for twins B, & !< drag coefficient d_caron !< distance of spontaneous annhihilation real(pReal), allocatable, dimension(:,:) :: & h_sl_sl, & !< components of slip-slip interaction matrix h_sl_tw, & !< components of slip-twin interaction matrix h_tw_tw, & !< components of twin-twin interaction matrix h_sl_tr, & !< components of slip-trans interaction matrix h_tr_tr, & !< components of trans-trans interaction matrix n0_sl, & !< slip system normal forestProjection, & C66 real(pReal), allocatable, dimension(:,:,:) :: & P_sl, & P_tw, & P_tr, & C66_tw, & C66_tr integer :: & sum_N_sl, & !< total number of active slip system sum_N_tw, & !< total number of active twin system sum_N_tr !< total number of active transformation system integer, allocatable, dimension(:,:) :: & fcc_twinNucleationSlipPair ! ToDo: Better name? Is also use for trans character(len=pStringLen), allocatable, dimension(:) :: & output logical :: & ExtendedDislocations, & !< consider split into partials for climb calculation fccTwinTransNucleation, & !< twinning and transformation models are for fcc omitDipoles !< flag controlling consideration of dipole formation character(len=:), allocatable, dimension(:) :: & systems_sl, & systems_tw end type !< container type for internal constitutive parameters type :: tDislotwinState real(pReal), dimension(:,:), pointer :: & rho_mob, & rho_dip, & gamma_sl, & f_tw, & f_tr end type tDislotwinState type :: tDislotwinDependentState real(pReal), dimension(:,:), allocatable :: & Lambda_sl, & !< mean free path between 2 obstacles seen by a moving dislocation Lambda_tw, & !< mean free path between 2 obstacles seen by a growing twin Lambda_tr, & !< mean free path between 2 obstacles seen by a growing martensite tau_pass, & !< threshold stress for slip tau_hat_tw, & !< threshold stress for twinning tau_hat_tr, & !< threshold stress for transformation V_tw, & !< volume of a new twin V_tr, & !< volume of a new martensite disc tau_r_tw, & !< stress to bring partials close together (twin) tau_r_tr !< stress to bring partials close together (trans) end type tDislotwinDependentState !-------------------------------------------------------------------------------------------------- ! containers for parameters and state type(tParameters), allocatable, dimension(:) :: param type(tDislotwinState), allocatable, dimension(:) :: & dotState, & state type(tDislotwinDependentState), allocatable, dimension(:) :: dependentState contains !-------------------------------------------------------------------------------------------------- !> @brief Perform module initialization. !> @details reads in material parameters, allocates arrays, and does sanity checks !-------------------------------------------------------------------------------------------------- module function plastic_dislotwin_init() result(myPlasticity) logical, dimension(:), allocatable :: myPlasticity integer :: & ph, i, & Nmembers, & sizeState, sizeDotState, & startIndex, endIndex integer, dimension(:), allocatable :: & N_sl, N_tw, N_tr real(pReal), allocatable, dimension(:) :: & rho_mob_0, & !< initial unipolar dislocation density per slip system rho_dip_0 !< initial dipole dislocation density per slip system character(len=pStringLen) :: & extmsg = '' class(tNode), pointer :: & phases, & phase, & mech, & pl myPlasticity = plastic_active('dislotwin') if(count(myPlasticity) == 0) return print'(/,a)', ' <<<+- phase:mechanical:plastic:dislotwin init -+>>>' print'(a,i0)', ' # phases: ',count(myPlasticity); flush(IO_STDOUT) print*, 'A. Ma and F. Roters, Acta Materialia 52(12):3603–3612, 2004' print*, 'https://doi.org/10.1016/j.actamat.2004.04.012'//IO_EOL print*, 'F. Roters et al., Computational Materials Science 39:91–95, 2007' print*, 'https://doi.org/10.1016/j.commatsci.2006.04.014'//IO_EOL print*, 'S.L. Wong et al., Acta Materialia 118:140–151, 2016' print*, 'https://doi.org/10.1016/j.actamat.2016.07.032' phases => config_material%get('phase') allocate(param(phases%length)) allocate(state(phases%length)) allocate(dotState(phases%length)) allocate(dependentState(phases%length)) do ph = 1, phases%length if(.not. myPlasticity(ph)) cycle associate(prm => param(ph), dot => dotState(ph), stt => state(ph), dst => dependentState(ph)) phase => phases%get(ph) mech => phase%get('mechanical') pl => mech%get('plastic') #if defined (__GFORTRAN__) prm%output = output_as1dString(pl) #else prm%output = pl%get_as1dString('output',defaultVal=emptyStringArray) #endif ! This data is read in already in lattice prm%mu = elastic_mu(ph) prm%nu = elastic_nu(ph) prm%C66 = elastic_C66(ph) !-------------------------------------------------------------------------------------------------- ! slip related parameters N_sl = pl%get_as1dInt('N_sl',defaultVal=emptyIntArray) prm%sum_N_sl = sum(abs(N_sl)) slipActive: if (prm%sum_N_sl > 0) then prm%systems_sl = lattice_labels_slip(N_sl,phase_lattice(ph)) prm%P_sl = lattice_SchmidMatrix_slip(N_sl,phase_lattice(ph),phase_cOverA(ph)) prm%h_sl_sl = lattice_interaction_SlipBySlip(N_sl,pl%get_as1dFloat('h_sl-sl'),phase_lattice(ph)) prm%forestProjection = lattice_forestProjection_edge(N_sl,phase_lattice(ph),phase_cOverA(ph)) prm%forestProjection = transpose(prm%forestProjection) prm%n0_sl = lattice_slip_normal(N_sl,phase_lattice(ph),phase_cOverA(ph)) prm%fccTwinTransNucleation = phase_lattice(ph) == 'cF' .and. (N_sl(1) == 12) if (prm%fccTwinTransNucleation) prm%fcc_twinNucleationSlipPair = lattice_FCC_TWINNUCLEATIONSLIPPAIR rho_mob_0 = pl%get_as1dFloat('rho_mob_0', requiredSize=size(N_sl)) rho_dip_0 = pl%get_as1dFloat('rho_dip_0', requiredSize=size(N_sl)) prm%v_0 = pl%get_as1dFloat('v_0', requiredSize=size(N_sl)) prm%b_sl = pl%get_as1dFloat('b_sl', requiredSize=size(N_sl)) prm%Q_sl = pl%get_as1dFloat('Q_sl', requiredSize=size(N_sl)) prm%i_sl = pl%get_as1dFloat('i_sl', requiredSize=size(N_sl)) prm%p = pl%get_as1dFloat('p_sl', requiredSize=size(N_sl)) prm%q = pl%get_as1dFloat('q_sl', requiredSize=size(N_sl)) prm%tau_0 = pl%get_as1dFloat('tau_0', requiredSize=size(N_sl)) prm%B = pl%get_as1dFloat('B', requiredSize=size(N_sl), & defaultVal=[(0.0_pReal, i=1,size(N_sl))]) prm%Q_cl = pl%get_asFloat('Q_cl') prm%ExtendedDislocations = pl%get_asBool('extend_dislocations',defaultVal = .false.) prm%omitDipoles = pl%get_asBool('omit_dipoles',defaultVal = .false.) ! multiplication factor according to crystal structure (nearest neighbors bcc vs fcc/hex) ! details: Argon & Moffat, Acta Metallurgica, Vol. 29, pg 293 to 299, 1981 prm%omega = pl%get_asFloat('omega', defaultVal = 1000.0_pReal) & * merge(12.0_pReal,8.0_pReal,any(phase_lattice(ph) == ['cF','hP'])) ! expand: family => system rho_mob_0 = math_expand(rho_mob_0, N_sl) rho_dip_0 = math_expand(rho_dip_0, N_sl) prm%v_0 = math_expand(prm%v_0, N_sl) prm%b_sl = math_expand(prm%b_sl, N_sl) prm%Q_sl = math_expand(prm%Q_sl, N_sl) prm%i_sl = math_expand(prm%i_sl, N_sl) prm%p = math_expand(prm%p, N_sl) prm%q = math_expand(prm%q, N_sl) prm%tau_0 = math_expand(prm%tau_0, N_sl) prm%B = math_expand(prm%B, N_sl) prm%d_caron = pl%get_asFloat('D_a') * prm%b_sl ! sanity checks if ( prm%Q_cl <= 0.0_pReal) extmsg = trim(extmsg)//' Q_cl' if (any(rho_mob_0 < 0.0_pReal)) extmsg = trim(extmsg)//' rho_mob_0' if (any(rho_dip_0 < 0.0_pReal)) extmsg = trim(extmsg)//' rho_dip_0' if (any(prm%v_0 < 0.0_pReal)) extmsg = trim(extmsg)//' v_0' if (any(prm%b_sl <= 0.0_pReal)) extmsg = trim(extmsg)//' b_sl' if (any(prm%Q_sl <= 0.0_pReal)) extmsg = trim(extmsg)//' Q_sl' if (any(prm%i_sl <= 0.0_pReal)) extmsg = trim(extmsg)//' i_sl' if (any(prm%B < 0.0_pReal)) extmsg = trim(extmsg)//' B' if (any(prm%d_caron < 0.0_pReal)) extmsg = trim(extmsg)//' d_caron(D_a,b_sl)' if (any(prm%p<=0.0_pReal .or. prm%p>1.0_pReal)) extmsg = trim(extmsg)//' p_sl' if (any(prm%q< 1.0_pReal .or. prm%q>2.0_pReal)) extmsg = trim(extmsg)//' q_sl' else slipActive rho_mob_0 = emptyRealArray; rho_dip_0 = emptyRealArray allocate(prm%b_sl,prm%Q_sl,prm%v_0,prm%i_sl,prm%p,prm%q,prm%B,source=emptyRealArray) allocate(prm%forestProjection(0,0),prm%h_sl_sl(0,0)) endif slipActive !-------------------------------------------------------------------------------------------------- ! twin related parameters N_tw = pl%get_as1dInt('N_tw', defaultVal=emptyIntArray) prm%sum_N_tw = sum(abs(N_tw)) twinActive: if (prm%sum_N_tw > 0) then prm%systems_tw = lattice_labels_twin(N_tw,phase_lattice(ph)) prm%P_tw = lattice_SchmidMatrix_twin(N_tw,phase_lattice(ph),phase_cOverA(ph)) prm%h_tw_tw = lattice_interaction_TwinByTwin(N_tw,pl%get_as1dFloat('h_tw-tw'), & phase_lattice(ph)) prm%b_tw = pl%get_as1dFloat('b_tw', requiredSize=size(N_tw)) prm%t_tw = pl%get_as1dFloat('t_tw', requiredSize=size(N_tw)) prm%r = pl%get_as1dFloat('p_tw', requiredSize=size(N_tw)) prm%x_c_tw = pl%get_asFloat('x_c_tw') prm%L_tw = pl%get_asFloat('L_tw') prm%i_tw = pl%get_asFloat('i_tw') prm%gamma_char= lattice_characteristicShear_Twin(N_tw,phase_lattice(ph),phase_cOverA(ph)) prm%C66_tw = lattice_C66_twin(N_tw,prm%C66,phase_lattice(ph),phase_cOverA(ph)) if (.not. prm%fccTwinTransNucleation) then prm%dot_N_0_tw = pl%get_as1dFloat('dot_N_0_tw') prm%dot_N_0_tw = math_expand(prm%dot_N_0_tw,N_tw) endif ! expand: family => system prm%b_tw = math_expand(prm%b_tw,N_tw) prm%t_tw = math_expand(prm%t_tw,N_tw) prm%r = math_expand(prm%r,N_tw) ! sanity checks if ( prm%x_c_tw < 0.0_pReal) extmsg = trim(extmsg)//' x_c_tw' if ( prm%L_tw < 0.0_pReal) extmsg = trim(extmsg)//' L_tw' if ( prm%i_tw < 0.0_pReal) extmsg = trim(extmsg)//' i_tw' if (any(prm%b_tw < 0.0_pReal)) extmsg = trim(extmsg)//' b_tw' if (any(prm%t_tw < 0.0_pReal)) extmsg = trim(extmsg)//' t_tw' if (any(prm%r < 0.0_pReal)) extmsg = trim(extmsg)//' p_tw' if (.not. prm%fccTwinTransNucleation) then if (any(prm%dot_N_0_tw < 0.0_pReal)) extmsg = trim(extmsg)//' dot_N_0_tw' endif else twinActive allocate(prm%gamma_char,prm%b_tw,prm%dot_N_0_tw,prm%t_tw,prm%r,source=emptyRealArray) allocate(prm%h_tw_tw(0,0)) endif twinActive !-------------------------------------------------------------------------------------------------- ! transformation related parameters N_tr = pl%get_as1dInt('N_tr', defaultVal=emptyIntArray) prm%sum_N_tr = sum(abs(N_tr)) transActive: if (prm%sum_N_tr > 0) then prm%b_tr = pl%get_as1dFloat('b_tr') prm%b_tr = math_expand(prm%b_tr,N_tr) prm%h = pl%get_asFloat('h', defaultVal=0.0_pReal) ! ToDo: How to handle that??? prm%i_tr = pl%get_asFloat('i_tr', defaultVal=0.0_pReal) ! ToDo: How to handle that??? prm%delta_G = pl%get_asFloat('delta_G') prm%x_c_tr = pl%get_asFloat('x_c_tr', defaultVal=0.0_pReal) ! ToDo: How to handle that??? prm%L_tr = pl%get_asFloat('L_tr') prm%h_tr_tr = lattice_interaction_TransByTrans(N_tr,pl%get_as1dFloat('h_tr-tr'),& phase_lattice(ph)) prm%C66_tr = lattice_C66_trans(N_tr,prm%C66,pl%get_asString('lattice_tr'), & 0.0_pReal, & pl%get_asFloat('a_cI', defaultVal=0.0_pReal), & pl%get_asFloat('a_cF', defaultVal=0.0_pReal)) prm%P_tr = lattice_SchmidMatrix_trans(N_tr,pl%get_asString('lattice_tr'), & 0.0_pReal, & pl%get_asFloat('a_cI', defaultVal=0.0_pReal), & pl%get_asFloat('a_cF', defaultVal=0.0_pReal)) if (phase_lattice(ph) /= 'cF') then prm%dot_N_0_tr = pl%get_as1dFloat('dot_N_0_tr') prm%dot_N_0_tr = math_expand(prm%dot_N_0_tr,N_tr) endif prm%t_tr = pl%get_as1dFloat('t_tr') prm%t_tr = math_expand(prm%t_tr,N_tr) prm%s = pl%get_as1dFloat('p_tr',defaultVal=[0.0_pReal]) prm%s = math_expand(prm%s,N_tr) ! sanity checks if ( prm%x_c_tr < 0.0_pReal) extmsg = trim(extmsg)//' x_c_tr' if ( prm%L_tr < 0.0_pReal) extmsg = trim(extmsg)//' L_tr' if ( prm%i_tr < 0.0_pReal) extmsg = trim(extmsg)//' i_tr' if (any(prm%t_tr < 0.0_pReal)) extmsg = trim(extmsg)//' t_tr' if (any(prm%s < 0.0_pReal)) extmsg = trim(extmsg)//' p_tr' if (phase_lattice(ph) /= 'cF') then if (any(prm%dot_N_0_tr < 0.0_pReal)) extmsg = trim(extmsg)//' dot_N_0_tr' endif else transActive allocate(prm%s,prm%b_tr,prm%t_tr,prm%dot_N_0_tr,source=emptyRealArray) allocate(prm%h_tr_tr(0,0)) endif transActive !-------------------------------------------------------------------------------------------------- ! shearband related parameters prm%v_sb = pl%get_asFloat('v_sb',defaultVal=0.0_pReal) if (prm%v_sb > 0.0_pReal) then prm%xi_sb = pl%get_asFloat('xi_sb') prm%E_sb = pl%get_asFloat('Q_sb') prm%p_sb = pl%get_asFloat('p_sb') prm%q_sb = pl%get_asFloat('q_sb') ! sanity checks if (prm%xi_sb < 0.0_pReal) extmsg = trim(extmsg)//' xi_sb' if (prm%E_sb < 0.0_pReal) extmsg = trim(extmsg)//' Q_sb' if (prm%p_sb <= 0.0_pReal) extmsg = trim(extmsg)//' p_sb' if (prm%q_sb <= 0.0_pReal) extmsg = trim(extmsg)//' q_sb' endif !-------------------------------------------------------------------------------------------------- ! parameters required for several mechanisms and their interactions if(prm%sum_N_sl + prm%sum_N_tw + prm%sum_N_tw > 0) & prm%D = pl%get_asFloat('D') if (prm%sum_N_tw + prm%sum_N_tr > 0) & prm%V_cs = pl%get_asFloat('V_cs') if (prm%sum_N_tw + prm%sum_N_tr > 0 .or. prm%ExtendedDislocations) then prm%T_ref = pl%get_asFloat('T_ref') prm%Gamma_sf(1) = pl%get_asFloat('Gamma_sf') prm%Gamma_sf(2) = pl%get_asFloat('Gamma_sf,T',defaultVal=0.0_pReal) endif slipAndTwinActive: if (prm%sum_N_sl * prm%sum_N_tw > 0) then prm%h_sl_tw = lattice_interaction_SlipByTwin(N_sl,N_tw,pl%get_as1dFloat('h_sl-tw'), & phase_lattice(ph)) if (prm%fccTwinTransNucleation .and. size(N_tw) /= 1) extmsg = trim(extmsg)//' N_tw: nucleation' endif slipAndTwinActive slipAndTransActive: if (prm%sum_N_sl * prm%sum_N_tr > 0) then prm%h_sl_tr = lattice_interaction_SlipByTrans(N_sl,N_tr,pl%get_as1dFloat('h_sl-tr'), & phase_lattice(ph)) if (prm%fccTwinTransNucleation .and. size(N_tr) /= 1) extmsg = trim(extmsg)//' N_tr: nucleation' endif slipAndTransActive !-------------------------------------------------------------------------------------------------- ! allocate state arrays Nmembers = count(material_phaseID == ph) sizeDotState = size(['rho_mob ','rho_dip ','gamma_sl']) * prm%sum_N_sl & + size(['f_tw']) * prm%sum_N_tw & + size(['f_tr']) * prm%sum_N_tr sizeState = sizeDotState call phase_allocateState(plasticState(ph),Nmembers,sizeState,sizeDotState,0) !-------------------------------------------------------------------------------------------------- ! locally defined state aliases and initialization of state0 and atol startIndex = 1 endIndex = prm%sum_N_sl stt%rho_mob=>plasticState(ph)%state(startIndex:endIndex,:) stt%rho_mob= spread(rho_mob_0,2,Nmembers) dot%rho_mob=>plasticState(ph)%dotState(startIndex:endIndex,:) plasticState(ph)%atol(startIndex:endIndex) = pl%get_asFloat('atol_rho',defaultVal=1.0_pReal) if (any(plasticState(ph)%atol(startIndex:endIndex) < 0.0_pReal)) extmsg = trim(extmsg)//' atol_rho' startIndex = endIndex + 1 endIndex = endIndex + prm%sum_N_sl stt%rho_dip=>plasticState(ph)%state(startIndex:endIndex,:) stt%rho_dip= spread(rho_dip_0,2,Nmembers) dot%rho_dip=>plasticState(ph)%dotState(startIndex:endIndex,:) plasticState(ph)%atol(startIndex:endIndex) = pl%get_asFloat('atol_rho',defaultVal=1.0_pReal) startIndex = endIndex + 1 endIndex = endIndex + prm%sum_N_sl stt%gamma_sl=>plasticState(ph)%state(startIndex:endIndex,:) dot%gamma_sl=>plasticState(ph)%dotState(startIndex:endIndex,:) plasticState(ph)%atol(startIndex:endIndex) = pl%get_asFloat('atol_gamma',defaultVal=1.0e-6_pReal) if(any(plasticState(ph)%atol(startIndex:endIndex) < 0.0_pReal)) extmsg = trim(extmsg)//' atol_gamma' startIndex = endIndex + 1 endIndex = endIndex + prm%sum_N_tw stt%f_tw=>plasticState(ph)%state(startIndex:endIndex,:) dot%f_tw=>plasticState(ph)%dotState(startIndex:endIndex,:) plasticState(ph)%atol(startIndex:endIndex) = pl%get_asFloat('atol_f_tw',defaultVal=1.0e-6_pReal) if (any(plasticState(ph)%atol(startIndex:endIndex) < 0.0_pReal)) extmsg = trim(extmsg)//' atol_f_tw' startIndex = endIndex + 1 endIndex = endIndex + prm%sum_N_tr stt%f_tr=>plasticState(ph)%state(startIndex:endIndex,:) dot%f_tr=>plasticState(ph)%dotState(startIndex:endIndex,:) plasticState(ph)%atol(startIndex:endIndex) = pl%get_asFloat('atol_f_tr',defaultVal=1.0e-6_pReal) if (any(plasticState(ph)%atol(startIndex:endIndex) < 0.0_pReal)) extmsg = trim(extmsg)//' atol_f_tr' allocate(dst%Lambda_sl (prm%sum_N_sl,Nmembers),source=0.0_pReal) allocate(dst%tau_pass (prm%sum_N_sl,Nmembers),source=0.0_pReal) allocate(dst%Lambda_tw (prm%sum_N_tw,Nmembers),source=0.0_pReal) allocate(dst%tau_hat_tw (prm%sum_N_tw,Nmembers),source=0.0_pReal) allocate(dst%tau_r_tw (prm%sum_N_tw,Nmembers),source=0.0_pReal) allocate(dst%V_tw (prm%sum_N_tw,Nmembers),source=0.0_pReal) allocate(dst%Lambda_tr (prm%sum_N_tr,Nmembers),source=0.0_pReal) allocate(dst%tau_hat_tr (prm%sum_N_tr,Nmembers),source=0.0_pReal) allocate(dst%tau_r_tr (prm%sum_N_tr,Nmembers),source=0.0_pReal) allocate(dst%V_tr (prm%sum_N_tr,Nmembers),source=0.0_pReal) end associate !-------------------------------------------------------------------------------------------------- ! exit if any parameter is out of range if (extmsg /= '') call IO_error(211,ext_msg=trim(extmsg)//'(dislotwin)') enddo end function plastic_dislotwin_init !-------------------------------------------------------------------------------------------------- !> @brief Return the homogenized elasticity matrix. !-------------------------------------------------------------------------------------------------- module function plastic_dislotwin_homogenizedC(ph,en) result(homogenizedC) integer, intent(in) :: & ph, en real(pReal), dimension(6,6) :: & homogenizedC integer :: i real(pReal) :: f_unrotated associate(prm => param(ph), stt => state(ph)) f_unrotated = 1.0_pReal & - sum(stt%f_tw(1:prm%sum_N_tw,en)) & - sum(stt%f_tr(1:prm%sum_N_tr,en)) homogenizedC = f_unrotated * prm%C66 do i=1,prm%sum_N_tw homogenizedC = homogenizedC & + stt%f_tw(i,en)*prm%C66_tw(1:6,1:6,i) enddo do i=1,prm%sum_N_tr homogenizedC = homogenizedC & + stt%f_tr(i,en)*prm%C66_tr(1:6,1:6,i) enddo end associate end function plastic_dislotwin_homogenizedC !-------------------------------------------------------------------------------------------------- !> @brief Calculate plastic velocity gradient and its tangent. !-------------------------------------------------------------------------------------------------- module subroutine dislotwin_LpAndItsTangent(Lp,dLp_dMp,Mp,T,ph,en) real(pReal), dimension(3,3), intent(out) :: Lp real(pReal), dimension(3,3,3,3), intent(out) :: dLp_dMp real(pReal), dimension(3,3), intent(in) :: Mp integer, intent(in) :: ph,en real(pReal), intent(in) :: T integer :: i,k,l,m,n real(pReal) :: & f_unrotated,StressRatio_p,& E_kB_T, & ddot_gamma_dtau, & tau real(pReal), dimension(param(ph)%sum_N_sl) :: & dot_gamma_sl,ddot_gamma_dtau_sl real(pReal), dimension(param(ph)%sum_N_tw) :: & dot_gamma_tw,ddot_gamma_dtau_tw real(pReal), dimension(param(ph)%sum_N_tr) :: & dot_gamma_tr,ddot_gamma_dtau_tr real(pReal):: dot_gamma_sb real(pReal), dimension(3,3) :: eigVectors, P_sb real(pReal), dimension(3) :: eigValues real(pReal), dimension(3,6), parameter :: & sb_sComposition = & reshape(real([& 1, 0, 1, & 1, 0,-1, & 1, 1, 0, & 1,-1, 0, & 0, 1, 1, & 0, 1,-1 & ],pReal),[ 3,6]), & sb_mComposition = & reshape(real([& 1, 0,-1, & 1, 0,+1, & 1,-1, 0, & 1, 1, 0, & 0, 1,-1, & 0, 1, 1 & ],pReal),[ 3,6]) associate(prm => param(ph), stt => state(ph)) f_unrotated = 1.0_pReal & - sum(stt%f_tw(1:prm%sum_N_tw,en)) & - sum(stt%f_tr(1:prm%sum_N_tr,en)) Lp = 0.0_pReal dLp_dMp = 0.0_pReal call kinetics_sl(Mp,T,ph,en,dot_gamma_sl,ddot_gamma_dtau_sl) slipContribution: do i = 1, prm%sum_N_sl Lp = Lp + dot_gamma_sl(i)*prm%P_sl(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_sl(i) * prm%P_sl(k,l,i) * prm%P_sl(m,n,i) enddo slipContribution call kinetics_tw(Mp,T,dot_gamma_sl,ph,en,dot_gamma_tw,ddot_gamma_dtau_tw) twinContibution: do i = 1, prm%sum_N_tw Lp = Lp + dot_gamma_tw(i)*prm%P_tw(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_tw(i)* prm%P_tw(k,l,i)*prm%P_tw(m,n,i) enddo twinContibution call kinetics_tr(Mp,T,dot_gamma_sl,ph,en,dot_gamma_tr,ddot_gamma_dtau_tr) transContibution: do i = 1, prm%sum_N_tr Lp = Lp + dot_gamma_tr(i)*prm%P_tr(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_tr(i)* prm%P_tr(k,l,i)*prm%P_tr(m,n,i) enddo transContibution Lp = Lp * f_unrotated dLp_dMp = dLp_dMp * f_unrotated shearBandingContribution: if(dNeq0(prm%v_sb)) then E_kB_T = prm%E_sb/(kB*T) call math_eigh33(eigValues,eigVectors,Mp) ! is Mp symmetric by design? do i = 1,6 P_sb = 0.5_pReal * math_outer(matmul(eigVectors,sb_sComposition(1:3,i)),& matmul(eigVectors,sb_mComposition(1:3,i))) tau = math_tensordot(Mp,P_sb) significantShearBandStress: if (abs(tau) > tol_math_check) then StressRatio_p = (abs(tau)/prm%xi_sb)**prm%p_sb dot_gamma_sb = sign(prm%v_sb*exp(-E_kB_T*(1-StressRatio_p)**prm%q_sb), tau) ddot_gamma_dtau = abs(dot_gamma_sb)*E_kB_T*prm%p_sb*prm%q_sb/prm%xi_sb & * (abs(tau)/prm%xi_sb)**(prm%p_sb-1.0_pReal) & * (1.0_pReal-StressRatio_p)**(prm%q_sb-1.0_pReal) Lp = Lp + dot_gamma_sb * P_sb 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 * P_sb(k,l) * P_sb(m,n) endif significantShearBandStress enddo endif shearBandingContribution end associate end subroutine dislotwin_LpAndItsTangent !-------------------------------------------------------------------------------------------------- !> @brief Calculate the rate of change of microstructure. !-------------------------------------------------------------------------------------------------- module subroutine dislotwin_dotState(Mp,T,ph,en) real(pReal), dimension(3,3), intent(in):: & Mp !< Mandel stress real(pReal), intent(in) :: & T !< temperature at integration point integer, intent(in) :: & ph, & en integer :: i real(pReal) :: & f_unrotated, & d_hat, & v_cl, & !< climb velocity tau, & sigma_cl, & !< climb stress b_d !< ratio of Burgers vector to stacking fault width real(pReal), dimension(param(ph)%sum_N_sl) :: & dot_rho_dip_formation, & dot_rho_dip_climb, & dot_gamma_sl real(pReal), dimension(param(ph)%sum_N_tw) :: & dot_gamma_tw real(pReal), dimension(param(ph)%sum_N_tr) :: & dot_gamma_tr associate(prm => param(ph), stt => state(ph), dot => dotState(ph), dst => dependentState(ph)) f_unrotated = 1.0_pReal & - sum(stt%f_tw(1:prm%sum_N_tw,en)) & - sum(stt%f_tr(1:prm%sum_N_tr,en)) call kinetics_sl(Mp,T,ph,en,dot_gamma_sl) dot%gamma_sl(:,en) = abs(dot_gamma_sl) slipState: do i = 1, prm%sum_N_sl tau = math_tensordot(Mp,prm%P_sl(1:3,1:3,i)) significantSlipStress: if (dEq0(tau) .or. prm%omitDipoles) then dot_rho_dip_formation(i) = 0.0_pReal dot_rho_dip_climb(i) = 0.0_pReal else significantSlipStress d_hat = 3.0_pReal*prm%mu*prm%b_sl(i)/(16.0_pReal*PI*abs(tau)) d_hat = math_clip(d_hat, right = dst%Lambda_sl(i,en)) d_hat = math_clip(d_hat, left = prm%d_caron(i)) dot_rho_dip_formation(i) = 2.0_pReal*(d_hat-prm%d_caron(i))/prm%b_sl(i) & * stt%rho_mob(i,en)*abs(dot_gamma_sl(i)) if (dEq(d_hat,prm%d_caron(i))) then dot_rho_dip_climb(i) = 0.0_pReal else ! Argon & Moffat, Acta Metallurgica, Vol. 29, pg 293 to 299, 1981 sigma_cl = dot_product(prm%n0_sl(1:3,i),matmul(Mp,prm%n0_sl(1:3,i))) b_d = merge(24.0_pReal*PI*(1.0_pReal - prm%nu)/(2.0_pReal + prm%nu) & * (prm%Gamma_sf(1) + prm%Gamma_sf(2) * T) / (prm%mu*prm%b_sl(i)), & 1.0_pReal, & prm%ExtendedDislocations) v_cl = 2.0_pReal*prm%omega*b_d**2.0_pReal*exp(-prm%Q_cl/(kB*T)) & * (exp(abs(sigma_cl)*prm%b_sl(i)**3.0_pReal/(kB*T)) - 1.0_pReal) dot_rho_dip_climb(i) = 4.0_pReal*v_cl*stt%rho_dip(i,en) & / (d_hat-prm%d_caron(i)) endif endif significantSlipStress enddo slipState dot%rho_mob(:,en) = abs(dot_gamma_sl)/(prm%b_sl*dst%Lambda_sl(:,en)) & - dot_rho_dip_formation & - 2.0_pReal*prm%d_caron/prm%b_sl * stt%rho_mob(:,en)*abs(dot_gamma_sl) dot%rho_dip(:,en) = dot_rho_dip_formation & - 2.0_pReal*prm%d_caron/prm%b_sl * stt%rho_dip(:,en)*abs(dot_gamma_sl) & - dot_rho_dip_climb call kinetics_tw(Mp,T,dot_gamma_sl,ph,en,dot_gamma_tw) dot%f_tw(:,en) = f_unrotated*dot_gamma_tw/prm%gamma_char call kinetics_tr(Mp,T,dot_gamma_sl,ph,en,dot_gamma_tr) dot%f_tr(:,en) = f_unrotated*dot_gamma_tr end associate end subroutine dislotwin_dotState !-------------------------------------------------------------------------------------------------- !> @brief Calculate derived quantities from state. !-------------------------------------------------------------------------------------------------- module subroutine dislotwin_dependentState(T,ph,en) integer, intent(in) :: & ph, & en real(pReal), intent(in) :: & T real(pReal) :: & sumf_tw,Gamma,sumf_tr real(pReal), dimension(param(ph)%sum_N_sl) :: & inv_lambda_sl real(pReal), dimension(param(ph)%sum_N_tw) :: & inv_lambda_tw_tw, & !< 1/mean free distance between 2 twin stacks from different systems seen by a growing twin f_over_t_tw real(pReal), dimension(param(ph)%sum_N_tr) :: & inv_lambda_tr_tr, & !< 1/mean free distance between 2 martensite stacks from different systems seen by a growing martensite f_over_t_tr real(pReal), dimension(:), allocatable :: & x0 associate(prm => param(ph), stt => state(ph), dst => dependentState(ph)) sumf_tw = sum(stt%f_tw(1:prm%sum_N_tw,en)) sumf_tr = sum(stt%f_tr(1:prm%sum_N_tr,en)) Gamma = prm%Gamma_sf(1) + prm%Gamma_sf(2) * T !* rescaled volume fraction for topology f_over_t_tw = stt%f_tw(1:prm%sum_N_tw,en)/prm%t_tw ! this is per system ... f_over_t_tr = sumf_tr/prm%t_tr ! but this not ! ToDo ...Physically correct, but naming could be adjusted inv_lambda_sl = sqrt(matmul(prm%forestProjection,stt%rho_mob(:,en)+stt%rho_dip(:,en)))/prm%i_sl if (prm%sum_N_tw > 0 .and. prm%sum_N_sl > 0) & inv_lambda_sl = inv_lambda_sl + matmul(prm%h_sl_tw,f_over_t_tw)/(1.0_pReal-sumf_tw) if (prm%sum_N_tr > 0 .and. prm%sum_N_sl > 0) & inv_lambda_sl = inv_lambda_sl + matmul(prm%h_sl_tr,f_over_t_tr)/(1.0_pReal-sumf_tr) dst%Lambda_sl(:,en) = prm%D / (1.0_pReal+prm%D*inv_lambda_sl) inv_lambda_tw_tw = matmul(prm%h_tw_tw,f_over_t_tw)/(1.0_pReal-sumf_tw) dst%Lambda_tw(:,en) = prm%i_tw*prm%D/(1.0_pReal+prm%D*inv_lambda_tw_tw) inv_lambda_tr_tr = matmul(prm%h_tr_tr,f_over_t_tr)/(1.0_pReal-sumf_tr) dst%Lambda_tr(:,en) = prm%i_tr*prm%D/(1.0_pReal+prm%D*inv_lambda_tr_tr) !* threshold stress for dislocation motion dst%tau_pass(:,en) = prm%mu*prm%b_sl* sqrt(matmul(prm%h_sl_sl,stt%rho_mob(:,en)+stt%rho_dip(:,en))) !* threshold stress for growing twin/martensite dst%tau_hat_tw(:,en) = Gamma/(3.0_pReal*prm%b_tw) & + 3.0_pReal*prm%b_tw*prm%mu/(prm%L_tw*prm%b_tw) dst%tau_hat_tr(:,en) = Gamma/(3.0_pReal*prm%b_tr) & + 3.0_pReal*prm%b_tr*prm%mu/(prm%L_tr*prm%b_tr) & + prm%h*prm%delta_G/(3.0_pReal*prm%b_tr) dst%V_tw(:,en) = (PI/4.0_pReal)*prm%t_tw*dst%Lambda_tw(:,en)**2.0_pReal dst%V_tr(:,en) = (PI/4.0_pReal)*prm%t_tr*dst%Lambda_tr(:,en)**2.0_pReal x0 = prm%mu*prm%b_tw**2.0_pReal/(Gamma*8.0_pReal*PI)*(2.0_pReal+prm%nu)/(1.0_pReal-prm%nu) ! ToDo: In the paper, this is the Burgers vector for slip dst%tau_r_tw(:,en) = prm%mu*prm%b_tw/(2.0_pReal*PI)*(1.0_pReal/(x0+prm%x_c_tw)+cos(pi/3.0_pReal)/x0) x0 = prm%mu*prm%b_tr**2.0_pReal/(Gamma*8.0_pReal*PI)*(2.0_pReal+prm%nu)/(1.0_pReal-prm%nu) ! ToDo: In the paper, this is the Burgers vector for slip dst%tau_r_tr(:,en) = prm%mu*prm%b_tr/(2.0_pReal*PI)*(1.0_pReal/(x0+prm%x_c_tr)+cos(pi/3.0_pReal)/x0) end associate end subroutine dislotwin_dependentState !-------------------------------------------------------------------------------------------------- !> @brief Write results to HDF5 output file. !-------------------------------------------------------------------------------------------------- module subroutine plastic_dislotwin_results(ph,group) integer, intent(in) :: ph character(len=*), intent(in) :: group integer :: ou associate(prm => param(ph), stt => state(ph), dst => dependentState(ph)) do ou = 1,size(prm%output) select case(trim(prm%output(ou))) case('rho_mob') call results_writeDataset(stt%rho_mob,group,trim(prm%output(ou)), & 'mobile dislocation density','1/m²',prm%systems_sl) case('rho_dip') call results_writeDataset(stt%rho_dip,group,trim(prm%output(ou)), & 'dislocation dipole density','1/m²',prm%systems_sl) case('gamma_sl') call results_writeDataset(stt%gamma_sl,group,trim(prm%output(ou)), & 'plastic shear','1',prm%systems_sl) case('Lambda_sl') call results_writeDataset(dst%Lambda_sl,group,trim(prm%output(ou)), & 'mean free path for slip','m',prm%systems_sl) case('tau_pass') call results_writeDataset(dst%tau_pass,group,trim(prm%output(ou)), & 'passing stress for slip','Pa',prm%systems_sl) case('f_tw') call results_writeDataset(stt%f_tw,group,trim(prm%output(ou)), & 'twinned volume fraction','m³/m³',prm%systems_tw) case('Lambda_tw') call results_writeDataset(dst%Lambda_tw,group,trim(prm%output(ou)), & 'mean free path for twinning','m',prm%systems_tw) case('tau_hat_tw') call results_writeDataset(dst%tau_hat_tw,group,trim(prm%output(ou)), & 'threshold stress for twinning','Pa',prm%systems_tw) case('f_tr') if(prm%sum_N_tr>0) call results_writeDataset(stt%f_tr,group,trim(prm%output(ou)), & 'martensite volume fraction','m³/m³') end select enddo end associate end subroutine plastic_dislotwin_results !-------------------------------------------------------------------------------------------------- !> @brief Calculate shear rates on slip systems, their derivatives with respect to resolved ! stress, and the resolved stress. !> @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_sl(Mp,T,ph,en, & dot_gamma_sl,ddot_gamma_dtau_sl,tau_sl) real(pReal), dimension(3,3), intent(in) :: & Mp !< Mandel stress real(pReal), intent(in) :: & T !< temperature integer, intent(in) :: & ph, & en real(pReal), dimension(param(ph)%sum_N_sl), intent(out) :: & dot_gamma_sl real(pReal), dimension(param(ph)%sum_N_sl), optional, intent(out) :: & ddot_gamma_dtau_sl, & tau_sl real(pReal), dimension(param(ph)%sum_N_sl) :: & ddot_gamma_dtau real(pReal), dimension(param(ph)%sum_N_sl) :: & tau, & stressRatio, & StressRatio_p, & Q_kB_T, & v_wait_inverse, & !< inverse of the effective velocity of a dislocation waiting at obstacles (unsigned) v_run_inverse, & !< inverse of the velocity of a free moving dislocation (unsigned) dV_wait_inverse_dTau, & dV_run_inverse_dTau, & dV_dTau, & tau_eff !< effective resolved stress integer :: i associate(prm => param(ph), stt => state(ph), dst => dependentState(ph)) tau = [(math_tensordot(Mp,prm%P_sl(1:3,1:3,i)),i = 1, prm%sum_N_sl)] tau_eff = abs(tau)-dst%tau_pass(:,en) significantStress: where(tau_eff > tol_math_check) stressRatio = tau_eff/prm%tau_0 StressRatio_p = stressRatio** prm%p Q_kB_T = prm%Q_sl/(kB*T) v_wait_inverse = prm%v_0**(-1.0_pReal) * exp(Q_kB_T*(1.0_pReal-StressRatio_p)** prm%q) v_run_inverse = prm%B/(tau_eff*prm%b_sl) dot_gamma_sl = sign(stt%rho_mob(:,en)*prm%b_sl/(v_wait_inverse+v_run_inverse),tau) dV_wait_inverse_dTau = -1.0_pReal * v_wait_inverse * prm%p * prm%q * Q_kB_T & * (stressRatio**(prm%p-1.0_pReal)) & * (1.0_pReal-StressRatio_p)**(prm%q-1.0_pReal) & / prm%tau_0 dV_run_inverse_dTau = -1.0_pReal * v_run_inverse/tau_eff dV_dTau = -1.0_pReal * (dV_wait_inverse_dTau+dV_run_inverse_dTau) & / (v_wait_inverse+v_run_inverse)**2.0_pReal ddot_gamma_dtau = dV_dTau*stt%rho_mob(:,en)*prm%b_sl else where significantStress dot_gamma_sl = 0.0_pReal ddot_gamma_dtau = 0.0_pReal end where significantStress end associate if(present(ddot_gamma_dtau_sl)) ddot_gamma_dtau_sl = ddot_gamma_dtau if(present(tau_sl)) tau_sl = tau end subroutine kinetics_sl !-------------------------------------------------------------------------------------------------- !> @brief Calculate shear rates on twin systems and their derivatives with respect to resolved ! stress. !> @details Derivatives 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_tw(Mp,T,dot_gamma_sl,ph,en,& dot_gamma_tw,ddot_gamma_dtau_tw) real(pReal), dimension(3,3), intent(in) :: & Mp !< Mandel stress real(pReal), intent(in) :: & T !< temperature integer, intent(in) :: & ph, & en real(pReal), dimension(param(ph)%sum_N_sl), intent(in) :: & dot_gamma_sl real(pReal), dimension(param(ph)%sum_N_tw), intent(out) :: & dot_gamma_tw real(pReal), dimension(param(ph)%sum_N_tw), optional, intent(out) :: & ddot_gamma_dtau_tw real, dimension(param(ph)%sum_N_tw) :: & tau, & Ndot0, & stressRatio_r, & ddot_gamma_dtau integer :: i,s1,s2 associate(prm => param(ph), stt => state(ph), dst => dependentState(ph)) do i = 1, prm%sum_N_tw tau(i) = math_tensordot(Mp,prm%P_tw(1:3,1:3,i)) isFCC: if (prm%fccTwinTransNucleation) then s1=prm%fcc_twinNucleationSlipPair(1,i) s2=prm%fcc_twinNucleationSlipPair(2,i) if (tau(i) < dst%tau_r_tw(i,en)) then ! ToDo: correct? Ndot0=(abs(dot_gamma_sl(s1))*(stt%rho_mob(s2,en)+stt%rho_dip(s2,en))+& abs(dot_gamma_sl(s2))*(stt%rho_mob(s1,en)+stt%rho_dip(s1,en)))/& (prm%L_tw*prm%b_sl(i))*& (1.0_pReal-exp(-prm%V_cs/(kB*T)*(dst%tau_r_tw(i,en)-tau(i)))) else Ndot0=0.0_pReal end if else isFCC Ndot0=prm%dot_N_0_tw(i) endif isFCC enddo significantStress: where(tau > tol_math_check) StressRatio_r = (dst%tau_hat_tw(:,en)/tau)**prm%r dot_gamma_tw = prm%gamma_char * dst%V_tw(:,en) * Ndot0*exp(-StressRatio_r) ddot_gamma_dtau = (dot_gamma_tw*prm%r/tau)*StressRatio_r else where significantStress dot_gamma_tw = 0.0_pReal ddot_gamma_dtau = 0.0_pReal end where significantStress end associate if(present(ddot_gamma_dtau_tw)) ddot_gamma_dtau_tw = ddot_gamma_dtau end subroutine kinetics_tw !-------------------------------------------------------------------------------------------------- !> @brief Calculate shear rates on transformation systems and their derivatives with respect to ! resolved stress. !> @details Derivatives 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_tr(Mp,T,dot_gamma_sl,ph,en,& dot_gamma_tr,ddot_gamma_dtau_tr) real(pReal), dimension(3,3), intent(in) :: & Mp !< Mandel stress real(pReal), intent(in) :: & T !< temperature integer, intent(in) :: & ph, & en real(pReal), dimension(param(ph)%sum_N_sl), intent(in) :: & dot_gamma_sl real(pReal), dimension(param(ph)%sum_N_tr), intent(out) :: & dot_gamma_tr real(pReal), dimension(param(ph)%sum_N_tr), optional, intent(out) :: & ddot_gamma_dtau_tr real, dimension(param(ph)%sum_N_tr) :: & tau, & Ndot0, & stressRatio_s, & ddot_gamma_dtau integer :: i,s1,s2 associate(prm => param(ph), stt => state(ph), dst => dependentState(ph)) do i = 1, prm%sum_N_tr tau(i) = math_tensordot(Mp,prm%P_tr(1:3,1:3,i)) isFCC: if (prm%fccTwinTransNucleation) then s1=prm%fcc_twinNucleationSlipPair(1,i) s2=prm%fcc_twinNucleationSlipPair(2,i) if (tau(i) < dst%tau_r_tr(i,en)) then ! ToDo: correct? Ndot0=(abs(dot_gamma_sl(s1))*(stt%rho_mob(s2,en)+stt%rho_dip(s2,en))+& abs(dot_gamma_sl(s2))*(stt%rho_mob(s1,en)+stt%rho_dip(s1,en)))/& (prm%L_tr*prm%b_sl(i))*& (1.0_pReal-exp(-prm%V_cs/(kB*T)*(dst%tau_r_tr(i,en)-tau(i)))) else Ndot0=0.0_pReal end if else isFCC Ndot0=prm%dot_N_0_tr(i) endif isFCC enddo significantStress: where(tau > tol_math_check) StressRatio_s = (dst%tau_hat_tr(:,en)/tau)**prm%s dot_gamma_tr = dst%V_tr(:,en) * Ndot0*exp(-StressRatio_s) ddot_gamma_dtau = (dot_gamma_tr*prm%s/tau)*StressRatio_s else where significantStress dot_gamma_tr = 0.0_pReal ddot_gamma_dtau = 0.0_pReal end where significantStress end associate if(present(ddot_gamma_dtau_tr)) ddot_gamma_dtau_tr = ddot_gamma_dtau end subroutine kinetics_tr end submodule dislotwin