547 lines
24 KiB
Fortran
547 lines
24 KiB
Fortran
!--------------------------------------------------------------------------------------------------
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!> @author Franz Roters, Max-Planck-Institut für Eisenforschung GmbH
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!> @author Philip Eisenlohr, Max-Planck-Institut für Eisenforschung GmbH
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!> @author Martin Diehl, Max-Planck-Institut für Eisenforschung GmbH
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!> @brief phenomenological crystal plasticity formulation using a powerlaw fitting
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!--------------------------------------------------------------------------------------------------
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submodule(phase:plastic) phenopowerlaw
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type :: tParameters
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real(pReal) :: &
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dot_gamma_0_sl = 1.0_pReal, & !< reference shear strain rate for slip
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dot_gamma_0_tw = 1.0_pReal, & !< reference shear strain rate for twin
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n_sl = 1.0_pReal, & !< stress exponent for slip
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n_tw = 1.0_pReal, & !< stress exponent for twin
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f_sl_sat_tw = 1.0_pReal, & !< push-up factor for slip saturation due to twinning
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c_1 = 1.0_pReal, &
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c_2 = 1.0_pReal, &
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c_3 = 1.0_pReal, &
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c_4 = 1.0_pReal, &
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h_0_sl_sl = 1.0_pReal, & !< reference hardening slip - slip
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h_0_tw_sl = 1.0_pReal, & !< reference hardening twin - slip
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h_0_tw_tw = 1.0_pReal, & !< reference hardening twin - twin
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a_sl = 1.0_pReal
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real(pReal), allocatable, dimension(:) :: &
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xi_inf_sl, & !< maximum critical shear stress for slip
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h_int, & !< per family hardening activity (optional)
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gamma_tw_char !< characteristic shear for twins
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real(pReal), allocatable, dimension(:,:) :: &
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h_sl_sl, & !< slip resistance from slip activity
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h_sl_tw, & !< slip resistance from twin activity
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h_tw_sl, & !< twin resistance from slip activity
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h_tw_tw !< twin resistance from twin activity
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real(pReal), allocatable, dimension(:,:,:) :: &
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P_sl, &
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P_tw, &
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nonSchmid_pos, &
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nonSchmid_neg
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integer :: &
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sum_N_sl, & !< total number of active slip system
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sum_N_tw !< total number of active twin systems
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logical :: &
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nonSchmidActive = .false.
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character(len=pStringLen), allocatable, dimension(:) :: &
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output
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end type tParameters
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type :: tPhenopowerlawState
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real(pReal), pointer, dimension(:,:) :: &
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xi_slip, &
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xi_twin, &
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gamma_slip, &
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gamma_twin
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end type tPhenopowerlawState
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!--------------------------------------------------------------------------------------------------
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! containers for parameters and state
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type(tParameters), allocatable, dimension(:) :: param
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type(tPhenopowerlawState), allocatable, dimension(:) :: &
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dotState, &
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state
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contains
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!--------------------------------------------------------------------------------------------------
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!> @brief Perform module initialization.
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!> @details reads in material parameters, allocates arrays, and does sanity checks
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!--------------------------------------------------------------------------------------------------
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module function plastic_phenopowerlaw_init() result(myPlasticity)
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logical, dimension(:), allocatable :: myPlasticity
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integer :: &
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p, i, &
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Nconstituents, &
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sizeState, sizeDotState, &
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startIndex, endIndex
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integer, dimension(:), allocatable :: &
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N_sl, N_tw
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real(pReal), dimension(:), allocatable :: &
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xi_0_sl, & !< initial critical shear stress for slip
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xi_0_tw, & !< initial critical shear stress for twin
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a !< non-Schmid coefficients
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character(len=pStringLen) :: &
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extmsg = ''
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class(tNode), pointer :: &
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phases, &
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phase, &
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mech, &
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pl
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myPlasticity = plastic_active('phenopowerlaw')
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if(count(myPlasticity) == 0) return
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print'(/,a)', ' <<<+- phase:mechanical:plastic:phenopowerlaw init -+>>>'
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print'(a,i0)', ' # phases: ',count(myPlasticity); flush(IO_STDOUT)
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phases => config_material%get('phase')
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allocate(param(phases%length))
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allocate(state(phases%length))
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allocate(dotState(phases%length))
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do p = 1, phases%length
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if(.not. myPlasticity(p)) cycle
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phase => phases%get(p)
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mech => phase%get('mechanics')
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i = p
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associate(prm => param(i), &
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dot => dotState(i), &
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stt => state(i))
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pl => mech%get('plasticity')
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!--------------------------------------------------------------------------------------------------
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! slip related parameters
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N_sl = pl%get_asInts('N_sl',defaultVal=emptyIntArray)
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prm%sum_N_sl = sum(abs(N_sl))
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slipActive: if (prm%sum_N_sl > 0) then
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prm%P_sl = lattice_SchmidMatrix_slip(N_sl,phase%get_asString('lattice'),&
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phase%get_asFloat('c/a',defaultVal=0.0_pReal))
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if(phase%get_asString('lattice') == 'cI') then
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a = pl%get_asFloats('a_nonSchmid',defaultVal=emptyRealArray)
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if(size(a) > 0) prm%nonSchmidActive = .true.
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prm%nonSchmid_pos = lattice_nonSchmidMatrix(N_sl,a,+1)
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prm%nonSchmid_neg = lattice_nonSchmidMatrix(N_sl,a,-1)
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else
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prm%nonSchmid_pos = prm%P_sl
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prm%nonSchmid_neg = prm%P_sl
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endif
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prm%h_sl_sl = lattice_interaction_SlipBySlip(N_sl, &
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pl%get_asFloats('h_sl_sl'), &
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phase%get_asString('lattice'))
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xi_0_sl = pl%get_asFloats('xi_0_sl', requiredSize=size(N_sl))
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prm%xi_inf_sl = pl%get_asFloats('xi_inf_sl', requiredSize=size(N_sl))
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prm%h_int = pl%get_asFloats('h_int', requiredSize=size(N_sl), &
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defaultVal=[(0.0_pReal,i=1,size(N_sl))])
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prm%dot_gamma_0_sl = pl%get_asFloat('dot_gamma_0_sl')
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prm%n_sl = pl%get_asFloat('n_sl')
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prm%a_sl = pl%get_asFloat('a_sl')
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prm%h_0_sl_sl = pl%get_asFloat('h_0_sl_sl')
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! expand: family => system
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xi_0_sl = math_expand(xi_0_sl, N_sl)
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prm%xi_inf_sl = math_expand(prm%xi_inf_sl,N_sl)
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prm%h_int = math_expand(prm%h_int, N_sl)
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! sanity checks
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if ( prm%dot_gamma_0_sl <= 0.0_pReal) extmsg = trim(extmsg)//' dot_gamma_0_sl'
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if ( prm%a_sl <= 0.0_pReal) extmsg = trim(extmsg)//' a_sl'
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if ( prm%n_sl <= 0.0_pReal) extmsg = trim(extmsg)//' n_sl'
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if (any(xi_0_sl <= 0.0_pReal)) extmsg = trim(extmsg)//' xi_0_sl'
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if (any(prm%xi_inf_sl <= 0.0_pReal)) extmsg = trim(extmsg)//' xi_inf_sl'
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else slipActive
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xi_0_sl = emptyRealArray
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allocate(prm%xi_inf_sl,prm%h_int,source=emptyRealArray)
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allocate(prm%h_sl_sl(0,0))
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endif slipActive
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!--------------------------------------------------------------------------------------------------
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! twin related parameters
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N_tw = pl%get_asInts('N_tw', defaultVal=emptyIntArray)
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prm%sum_N_tw = sum(abs(N_tw))
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twinActive: if (prm%sum_N_tw > 0) then
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prm%P_tw = lattice_SchmidMatrix_twin(N_tw,phase%get_asString('lattice'),&
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phase%get_asFloat('c/a',defaultVal=0.0_pReal))
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prm%h_tw_tw = lattice_interaction_TwinByTwin(N_tw,&
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pl%get_asFloats('h_tw_tw'), &
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phase%get_asString('lattice'))
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prm%gamma_tw_char = lattice_characteristicShear_twin(N_tw,phase%get_asString('lattice'),&
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phase%get_asFloat('c/a',defaultVal=0.0_pReal))
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xi_0_tw = pl%get_asFloats('xi_0_tw',requiredSize=size(N_tw))
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prm%c_1 = pl%get_asFloat('c_1',defaultVal=0.0_pReal)
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prm%c_2 = pl%get_asFloat('c_2',defaultVal=1.0_pReal)
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prm%c_3 = pl%get_asFloat('c_3',defaultVal=0.0_pReal)
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prm%c_4 = pl%get_asFloat('c_4',defaultVal=0.0_pReal)
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prm%dot_gamma_0_tw = pl%get_asFloat('dot_gamma_0_tw')
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prm%n_tw = pl%get_asFloat('n_tw')
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prm%f_sl_sat_tw = pl%get_asFloat('f_sl_sat_tw')
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prm%h_0_tw_tw = pl%get_asFloat('h_0_tw_tw')
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! expand: family => system
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xi_0_tw = math_expand(xi_0_tw,N_tw)
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! sanity checks
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if (prm%dot_gamma_0_tw <= 0.0_pReal) extmsg = trim(extmsg)//' dot_gamma_0_tw'
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if (prm%n_tw <= 0.0_pReal) extmsg = trim(extmsg)//' n_tw'
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else twinActive
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xi_0_tw = emptyRealArray
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allocate(prm%gamma_tw_char,source=emptyRealArray)
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allocate(prm%h_tw_tw(0,0))
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endif twinActive
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!--------------------------------------------------------------------------------------------------
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! slip-twin related parameters
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slipAndTwinActive: if (prm%sum_N_sl > 0 .and. prm%sum_N_tw > 0) then
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prm%h_0_tw_sl = pl%get_asFloat('h_0_tw_sl')
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prm%h_sl_tw = lattice_interaction_SlipByTwin(N_sl,N_tw,&
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pl%get_asFloats('h_sl_tw'), &
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phase%get_asString('lattice'))
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prm%h_tw_sl = lattice_interaction_TwinBySlip(N_tw,N_sl,&
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pl%get_asFloats('h_tw_sl'), &
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phase%get_asString('lattice'))
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else slipAndTwinActive
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allocate(prm%h_sl_tw(prm%sum_N_sl,prm%sum_N_tw)) ! at least one dimension is 0
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allocate(prm%h_tw_sl(prm%sum_N_tw,prm%sum_N_sl)) ! at least one dimension is 0
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prm%h_0_tw_sl = 0.0_pReal
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endif slipAndTwinActive
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!--------------------------------------------------------------------------------------------------
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! output pararameters
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#if defined (__GFORTRAN__)
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prm%output = output_asStrings(pl)
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#else
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prm%output = pl%get_asStrings('output',defaultVal=emptyStringArray)
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#endif
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!--------------------------------------------------------------------------------------------------
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! allocate state arrays
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Nconstituents = count(material_phaseAt2 == p)
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sizeDotState = size(['xi_sl ','gamma_sl']) * prm%sum_N_sl &
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+ size(['xi_tw ','gamma_tw']) * prm%sum_N_tw
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sizeState = sizeDotState
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call phase_allocateState(plasticState(p),Nconstituents,sizeState,sizeDotState,0)
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!--------------------------------------------------------------------------------------------------
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! state aliases and initialization
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startIndex = 1
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endIndex = prm%sum_N_sl
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stt%xi_slip => plasticState(p)%state (startIndex:endIndex,:)
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stt%xi_slip = spread(xi_0_sl, 2, Nconstituents)
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dot%xi_slip => plasticState(p)%dotState(startIndex:endIndex,:)
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plasticState(p)%atol(startIndex:endIndex) = pl%get_asFloat('atol_xi',defaultVal=1.0_pReal)
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if(any(plasticState(p)%atol(startIndex:endIndex) < 0.0_pReal)) extmsg = trim(extmsg)//' atol_xi'
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startIndex = endIndex + 1
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endIndex = endIndex + prm%sum_N_tw
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stt%xi_twin => plasticState(p)%state (startIndex:endIndex,:)
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stt%xi_twin = spread(xi_0_tw, 2, Nconstituents)
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dot%xi_twin => plasticState(p)%dotState(startIndex:endIndex,:)
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plasticState(p)%atol(startIndex:endIndex) = pl%get_asFloat('atol_xi',defaultVal=1.0_pReal)
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if(any(plasticState(p)%atol(startIndex:endIndex) < 0.0_pReal)) extmsg = trim(extmsg)//' atol_xi'
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startIndex = endIndex + 1
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endIndex = endIndex + prm%sum_N_sl
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stt%gamma_slip => plasticState(p)%state (startIndex:endIndex,:)
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dot%gamma_slip => plasticState(p)%dotState(startIndex:endIndex,:)
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plasticState(p)%atol(startIndex:endIndex) = pl%get_asFloat('atol_gamma',defaultVal=1.0e-6_pReal)
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if(any(plasticState(p)%atol(startIndex:endIndex) < 0.0_pReal)) extmsg = trim(extmsg)//' atol_gamma'
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! global alias
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plasticState(p)%slipRate => plasticState(p)%dotState(startIndex:endIndex,:)
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startIndex = endIndex + 1
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endIndex = endIndex + prm%sum_N_tw
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stt%gamma_twin => plasticState(p)%state (startIndex:endIndex,:)
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dot%gamma_twin => plasticState(p)%dotState(startIndex:endIndex,:)
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plasticState(p)%atol(startIndex:endIndex) = pl%get_asFloat('atol_gamma',defaultVal=1.0e-6_pReal)
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if(any(plasticState(p)%atol(startIndex:endIndex) < 0.0_pReal)) extmsg = trim(extmsg)//' atol_gamma'
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plasticState(p)%state0 = plasticState(p)%state ! ToDo: this could be done centrally
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end associate
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!--------------------------------------------------------------------------------------------------
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! exit if any parameter is out of range
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if (extmsg /= '') call IO_error(211,ext_msg=trim(extmsg)//'(phenopowerlaw)')
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enddo
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end function plastic_phenopowerlaw_init
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!--------------------------------------------------------------------------------------------------
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!> @brief Calculate plastic velocity gradient and its tangent.
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!> @details asummes that deformation by dislocation glide affects twinned and untwinned volume
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! equally (Taylor assumption). Twinning happens only in untwinned volume
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!--------------------------------------------------------------------------------------------------
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pure module subroutine phenopowerlaw_LpAndItsTangent(Lp,dLp_dMp,Mp,ph,me)
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real(pReal), dimension(3,3), intent(out) :: &
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Lp !< plastic velocity gradient
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real(pReal), dimension(3,3,3,3), intent(out) :: &
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dLp_dMp !< derivative of Lp with respect to the Mandel stress
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real(pReal), dimension(3,3), intent(in) :: &
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Mp !< Mandel stress
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integer, intent(in) :: &
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ph, &
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me
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integer :: &
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i,k,l,m,n
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real(pReal), dimension(param(ph)%sum_N_sl) :: &
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gdot_slip_pos,gdot_slip_neg, &
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dgdot_dtauslip_pos,dgdot_dtauslip_neg
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real(pReal), dimension(param(ph)%sum_N_tw) :: &
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gdot_twin,dgdot_dtautwin
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Lp = 0.0_pReal
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dLp_dMp = 0.0_pReal
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associate(prm => param(ph))
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call kinetics_slip(Mp,ph,me,gdot_slip_pos,gdot_slip_neg,dgdot_dtauslip_pos,dgdot_dtauslip_neg)
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slipSystems: do i = 1, prm%sum_N_sl
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Lp = Lp + (gdot_slip_pos(i)+gdot_slip_neg(i))*prm%P_sl(1:3,1:3,i)
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forall (k=1:3,l=1:3,m=1:3,n=1:3) &
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dLp_dMp(k,l,m,n) = dLp_dMp(k,l,m,n) &
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+ dgdot_dtauslip_pos(i) * prm%P_sl(k,l,i) * prm%nonSchmid_pos(m,n,i) &
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+ dgdot_dtauslip_neg(i) * prm%P_sl(k,l,i) * prm%nonSchmid_neg(m,n,i)
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enddo slipSystems
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call kinetics_twin(Mp,ph,me,gdot_twin,dgdot_dtautwin)
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twinSystems: do i = 1, prm%sum_N_tw
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Lp = Lp + gdot_twin(i)*prm%P_tw(1:3,1:3,i)
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forall (k=1:3,l=1:3,m=1:3,n=1:3) &
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dLp_dMp(k,l,m,n) = dLp_dMp(k,l,m,n) &
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+ dgdot_dtautwin(i)*prm%P_tw(k,l,i)*prm%P_tw(m,n,i)
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enddo twinSystems
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end associate
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end subroutine phenopowerlaw_LpAndItsTangent
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!--------------------------------------------------------------------------------------------------
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!> @brief Calculate the rate of change of microstructure.
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!--------------------------------------------------------------------------------------------------
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module subroutine phenopowerlaw_dotState(Mp,ph,me)
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real(pReal), dimension(3,3), intent(in) :: &
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Mp !< Mandel stress
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integer, intent(in) :: &
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ph, &
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me
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real(pReal) :: &
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c_SlipSlip,c_TwinSlip,c_TwinTwin, &
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xi_slip_sat_offset,&
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sumGamma,sumF
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real(pReal), dimension(param(ph)%sum_N_sl) :: &
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left_SlipSlip,right_SlipSlip, &
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gdot_slip_pos,gdot_slip_neg
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associate(prm => param(ph), stt => state(ph), &
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dot => dotState(ph))
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sumGamma = sum(stt%gamma_slip(:,me))
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sumF = sum(stt%gamma_twin(:,me)/prm%gamma_tw_char)
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!--------------------------------------------------------------------------------------------------
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! system-independent (nonlinear) prefactors to M_Xx (X influenced by x) matrices
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c_SlipSlip = prm%h_0_sl_sl * (1.0_pReal + prm%c_1*sumF** prm%c_2)
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c_TwinSlip = prm%h_0_tw_sl * sumGamma**prm%c_3
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c_TwinTwin = prm%h_0_tw_tw * sumF**prm%c_4
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!--------------------------------------------------------------------------------------------------
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! calculate left and right vectors
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left_SlipSlip = 1.0_pReal + prm%h_int
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xi_slip_sat_offset = prm%f_sl_sat_tw*sqrt(sumF)
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right_SlipSlip = abs(1.0_pReal-stt%xi_slip(:,me) / (prm%xi_inf_sl+xi_slip_sat_offset)) **prm%a_sl &
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* sign(1.0_pReal,1.0_pReal-stt%xi_slip(:,me) / (prm%xi_inf_sl+xi_slip_sat_offset))
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!--------------------------------------------------------------------------------------------------
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! shear rates
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call kinetics_slip(Mp,ph,me,gdot_slip_pos,gdot_slip_neg)
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dot%gamma_slip(:,me) = abs(gdot_slip_pos+gdot_slip_neg)
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call kinetics_twin(Mp,ph,me,dot%gamma_twin(:,me))
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!--------------------------------------------------------------------------------------------------
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! hardening
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dot%xi_slip(:,me) = c_SlipSlip * left_SlipSlip * &
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matmul(prm%h_sl_sl,dot%gamma_slip(:,me)*right_SlipSlip) &
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+ matmul(prm%h_sl_tw,dot%gamma_twin(:,me))
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dot%xi_twin(:,me) = c_TwinSlip * matmul(prm%h_tw_sl,dot%gamma_slip(:,me)) &
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+ c_TwinTwin * matmul(prm%h_tw_tw,dot%gamma_twin(:,me))
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end associate
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end subroutine phenopowerlaw_dotState
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!--------------------------------------------------------------------------------------------------
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!> @brief Write results to HDF5 output file.
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!--------------------------------------------------------------------------------------------------
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module subroutine plastic_phenopowerlaw_results(ph,group)
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integer, intent(in) :: ph
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character(len=*), intent(in) :: group
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integer :: o
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associate(prm => param(ph), stt => state(ph))
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outputsLoop: do o = 1,size(prm%output)
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select case(trim(prm%output(o)))
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case('xi_sl')
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if(prm%sum_N_sl>0) call results_writeDataset(group,stt%xi_slip, trim(prm%output(o)), &
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'resistance against plastic slip','Pa')
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case('gamma_sl')
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if(prm%sum_N_sl>0) call results_writeDataset(group,stt%gamma_slip,trim(prm%output(o)), &
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'plastic shear','1')
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case('xi_tw')
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if(prm%sum_N_tw>0) call results_writeDataset(group,stt%xi_twin, trim(prm%output(o)), &
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'resistance against twinning','Pa')
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case('gamma_tw')
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if(prm%sum_N_tw>0) call results_writeDataset(group,stt%gamma_twin,trim(prm%output(o)), &
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'twinning shear','1')
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end select
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enddo outputsLoop
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end associate
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end subroutine plastic_phenopowerlaw_results
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|
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!--------------------------------------------------------------------------------------------------
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!> @brief Calculate shear rates on slip systems and their derivatives with respect to resolved
|
|
! stress.
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|
!> @details Derivatives are calculated only optionally.
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|
! NOTE: Against the common convention, the result (i.e. intent(out)) variables are the last to
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|
! have the optional arguments at the end.
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|
!--------------------------------------------------------------------------------------------------
|
|
pure subroutine kinetics_slip(Mp,ph,me, &
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gdot_slip_pos,gdot_slip_neg,dgdot_dtau_slip_pos,dgdot_dtau_slip_neg)
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|
|
real(pReal), dimension(3,3), intent(in) :: &
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|
Mp !< Mandel stress
|
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integer, intent(in) :: &
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|
ph, &
|
|
me
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|
|
|
real(pReal), intent(out), dimension(param(ph)%sum_N_sl) :: &
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|
gdot_slip_pos, &
|
|
gdot_slip_neg
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|
real(pReal), intent(out), optional, dimension(param(ph)%sum_N_sl) :: &
|
|
dgdot_dtau_slip_pos, &
|
|
dgdot_dtau_slip_neg
|
|
|
|
real(pReal), dimension(param(ph)%sum_N_sl) :: &
|
|
tau_slip_pos, &
|
|
tau_slip_neg
|
|
integer :: i
|
|
|
|
associate(prm => param(ph), stt => state(ph))
|
|
|
|
do i = 1, prm%sum_N_sl
|
|
tau_slip_pos(i) = math_tensordot(Mp,prm%nonSchmid_pos(1:3,1:3,i))
|
|
tau_slip_neg(i) = merge(math_tensordot(Mp,prm%nonSchmid_neg(1:3,1:3,i)), &
|
|
0.0_pReal, prm%nonSchmidActive)
|
|
enddo
|
|
|
|
where(dNeq0(tau_slip_pos))
|
|
gdot_slip_pos = prm%dot_gamma_0_sl * merge(0.5_pReal,1.0_pReal, prm%nonSchmidActive) & ! 1/2 if non-Schmid active
|
|
* sign(abs(tau_slip_pos/stt%xi_slip(:,me))**prm%n_sl, tau_slip_pos)
|
|
else where
|
|
gdot_slip_pos = 0.0_pReal
|
|
end where
|
|
|
|
where(dNeq0(tau_slip_neg))
|
|
gdot_slip_neg = prm%dot_gamma_0_sl * 0.5_pReal & ! only used if non-Schmid active, always 1/2
|
|
* sign(abs(tau_slip_neg/stt%xi_slip(:,me))**prm%n_sl, tau_slip_neg)
|
|
else where
|
|
gdot_slip_neg = 0.0_pReal
|
|
end where
|
|
|
|
if (present(dgdot_dtau_slip_pos)) then
|
|
where(dNeq0(gdot_slip_pos))
|
|
dgdot_dtau_slip_pos = gdot_slip_pos*prm%n_sl/tau_slip_pos
|
|
else where
|
|
dgdot_dtau_slip_pos = 0.0_pReal
|
|
end where
|
|
endif
|
|
if (present(dgdot_dtau_slip_neg)) then
|
|
where(dNeq0(gdot_slip_neg))
|
|
dgdot_dtau_slip_neg = gdot_slip_neg*prm%n_sl/tau_slip_neg
|
|
else where
|
|
dgdot_dtau_slip_neg = 0.0_pReal
|
|
end where
|
|
endif
|
|
end associate
|
|
|
|
end subroutine kinetics_slip
|
|
|
|
|
|
!--------------------------------------------------------------------------------------------------
|
|
!> @brief Calculate shear rates on twin systems and their derivatives with respect to resolved
|
|
! stress. Twinning is assumed to take place only in untwinned volume.
|
|
!> @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_twin(Mp,ph,me,&
|
|
gdot_twin,dgdot_dtau_twin)
|
|
|
|
real(pReal), dimension(3,3), intent(in) :: &
|
|
Mp !< Mandel stress
|
|
integer, intent(in) :: &
|
|
ph, &
|
|
me
|
|
|
|
real(pReal), dimension(param(ph)%sum_N_tw), intent(out) :: &
|
|
gdot_twin
|
|
real(pReal), dimension(param(ph)%sum_N_tw), intent(out), optional :: &
|
|
dgdot_dtau_twin
|
|
|
|
real(pReal), dimension(param(ph)%sum_N_tw) :: &
|
|
tau_twin
|
|
integer :: i
|
|
|
|
associate(prm => param(ph), stt => state(ph))
|
|
|
|
do i = 1, prm%sum_N_tw
|
|
tau_twin(i) = math_tensordot(Mp,prm%P_tw(1:3,1:3,i))
|
|
enddo
|
|
|
|
where(tau_twin > 0.0_pReal)
|
|
gdot_twin = (1.0_pReal-sum(stt%gamma_twin(:,me)/prm%gamma_tw_char)) & ! only twin in untwinned volume fraction
|
|
* prm%dot_gamma_0_tw*(abs(tau_twin)/stt%xi_twin(:,me))**prm%n_tw
|
|
else where
|
|
gdot_twin = 0.0_pReal
|
|
end where
|
|
|
|
if (present(dgdot_dtau_twin)) then
|
|
where(dNeq0(gdot_twin))
|
|
dgdot_dtau_twin = gdot_twin*prm%n_tw/tau_twin
|
|
else where
|
|
dgdot_dtau_twin = 0.0_pReal
|
|
end where
|
|
endif
|
|
|
|
end associate
|
|
|
|
end subroutine kinetics_twin
|
|
|
|
end submodule phenopowerlaw
|