392 lines
16 KiB
Fortran
392 lines
16 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 material subroutine for isotropic plasticity
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!> @details Isotropic Plasticity which resembles the phenopowerlaw plasticity without
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!! resolving the stress on the slip systems. Will give the response of phenopowerlaw for an
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!! untextured polycrystal
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!--------------------------------------------------------------------------------------------------
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module plastic_isotropic
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use prec
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use debug
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use math
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use IO
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use material
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use config
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use discretization
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use results
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implicit none
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private
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enum, bind(c)
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enumerator :: &
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undefined_ID, &
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xi_ID, &
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dot_gamma_ID
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end enum
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type :: tParameters
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real(pReal) :: &
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M, & !< Taylor factor
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xi_0, & !< initial critical stress
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dot_gamma_0, & !< reference strain rate
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n, & !< stress exponent
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h0, &
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h_ln, &
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xi_inf, & !< maximum critical stress
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a, &
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c_1, &
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c_4, &
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c_3, &
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c_2, &
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aTol_xi, &
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aTol_gamma
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integer :: &
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of_debug = 0
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integer(kind(undefined_ID)), allocatable, dimension(:) :: &
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outputID
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logical :: &
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dilatation
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end type tParameters
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type :: tIsotropicState
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real(pReal), pointer, dimension(:) :: &
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xi, &
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gamma
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end type tIsotropicState
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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(tIsotropicState), allocatable, dimension(:) :: &
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dotState, &
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state
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public :: &
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plastic_isotropic_init, &
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plastic_isotropic_LpAndItsTangent, &
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plastic_isotropic_LiAndItsTangent, &
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plastic_isotropic_dotState, &
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plastic_isotropic_results
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contains
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!--------------------------------------------------------------------------------------------------
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!> @brief 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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subroutine plastic_isotropic_init
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integer :: &
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Ninstance, &
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p, i, &
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NipcMyPhase, &
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sizeState, sizeDotState
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integer(kind(undefined_ID)) :: &
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outputID
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character(len=pStringLen) :: &
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extmsg = ''
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character(len=pStringLen), dimension(:), allocatable :: &
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outputs
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write(6,'(/,a)') ' <<<+- plastic_'//PLASTICITY_ISOTROPIC_label//' init -+>>>'
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write(6,'(/,a)') ' Maiti and Eisenlohr, Scripta Materialia 145:37–40, 2018'
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write(6,'(a)') ' https://doi.org/10.1016/j.scriptamat.2017.09.047'
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Ninstance = count(phase_plasticity == PLASTICITY_ISOTROPIC_ID)
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if (iand(debug_level(debug_constitutive),debug_levelBasic) /= 0) &
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write(6,'(a16,1x,i5,/)') '# instances:',Ninstance
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allocate(param(Ninstance))
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allocate(state(Ninstance))
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allocate(dotState(Ninstance))
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do p = 1, size(phase_plasticity)
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if (phase_plasticity(p) /= PLASTICITY_ISOTROPIC_ID) cycle
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associate(prm => param(phase_plasticityInstance(p)), &
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dot => dotState(phase_plasticityInstance(p)), &
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stt => state(phase_plasticityInstance(p)), &
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config => config_phase(p))
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#ifdef DEBUG
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if (p==material_phaseAt(debug_g,debug_e)) &
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prm%of_debug = material_phasememberAt(debug_g,debug_i,debug_e)
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#endif
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prm%xi_0 = config%getFloat('tau0')
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prm%xi_inf = config%getFloat('tausat')
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prm%dot_gamma_0 = config%getFloat('gdot0')
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prm%n = config%getFloat('n')
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prm%h0 = config%getFloat('h0')
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prm%M = config%getFloat('m')
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prm%h_ln = config%getFloat('h0_slopelnrate', defaultVal=0.0_pReal)
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prm%c_1 = config%getFloat('tausat_sinhfita',defaultVal=0.0_pReal)
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prm%c_4 = config%getFloat('tausat_sinhfitb',defaultVal=0.0_pReal)
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prm%c_3 = config%getFloat('tausat_sinhfitc',defaultVal=0.0_pReal)
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prm%c_2 = config%getFloat('tausat_sinhfitd',defaultVal=0.0_pReal)
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prm%a = config%getFloat('a')
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prm%aTol_xi = config%getFloat('atol_flowstress',defaultVal=1.0_pReal)
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prm%aTol_gamma = config%getFloat('atol_shear', defaultVal=1.0e-6_pReal)
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prm%dilatation = config%keyExists('/dilatation/')
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!--------------------------------------------------------------------------------------------------
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! sanity checks
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extmsg = ''
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if (prm%aTol_gamma <= 0.0_pReal) extmsg = trim(extmsg)//' aTol_gamma'
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if (prm%xi_0 < 0.0_pReal) extmsg = trim(extmsg)//' xi_0'
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if (prm%dot_gamma_0 <= 0.0_pReal) extmsg = trim(extmsg)//' dot_gamma_0'
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if (prm%n <= 0.0_pReal) extmsg = trim(extmsg)//' n'
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if (prm%a <= 0.0_pReal) extmsg = trim(extmsg)//' a'
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if (prm%M <= 0.0_pReal) extmsg = trim(extmsg)//' m'
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if (prm%aTol_xi <= 0.0_pReal) extmsg = trim(extmsg)//' atol_xi'
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if (prm%aTol_gamma <= 0.0_pReal) extmsg = trim(extmsg)//' atol_shear'
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!--------------------------------------------------------------------------------------------------
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! exit if any parameter is out of range
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if (extmsg /= '') &
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call IO_error(211,ext_msg=trim(extmsg)//'('//PLASTICITY_ISOTROPIC_label//')')
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!--------------------------------------------------------------------------------------------------
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! output pararameters
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outputs = config%getStrings('(output)',defaultVal=emptyStringArray)
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allocate(prm%outputID(0))
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do i=1, size(outputs)
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outputID = undefined_ID
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select case(outputs(i))
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case ('flowstress')
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outputID = xi_ID
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case ('strainrate')
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outputID = dot_gamma_ID
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end select
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if (outputID /= undefined_ID) then
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prm%outputID = [prm%outputID, outputID]
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endif
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enddo
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!--------------------------------------------------------------------------------------------------
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! allocate state arrays
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NipcMyPhase = count(material_phaseAt == p) * discretization_nIP
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sizeDotState = size(['xi ','accumulated_shear'])
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sizeState = sizeDotState
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call material_allocatePlasticState(p,NipcMyPhase,sizeState,sizeDotState,0)
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!--------------------------------------------------------------------------------------------------
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! locally defined state aliases and initialization of state0 and aTolState
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stt%xi => plasticState(p)%state (1,:)
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stt%xi = prm%xi_0
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dot%xi => plasticState(p)%dotState(1,:)
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plasticState(p)%aTolState(1) = prm%aTol_xi
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stt%gamma => plasticState(p)%state (2,:)
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dot%gamma => plasticState(p)%dotState(2,:)
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plasticState(p)%aTolState(2) = prm%aTol_gamma
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! global alias
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plasticState(p)%slipRate => plasticState(p)%dotState(2:2,:)
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plasticState(p)%accumulatedSlip => plasticState(p)%state (2:2,:)
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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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enddo
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end subroutine plastic_isotropic_init
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!--------------------------------------------------------------------------------------------------
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!> @brief calculates plastic velocity gradient and its tangent
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!--------------------------------------------------------------------------------------------------
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subroutine plastic_isotropic_LpAndItsTangent(Lp,dLp_dMp,Mp,instance,of)
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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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instance, &
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of
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real(pReal), dimension(3,3) :: &
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Mp_dev !< deviatoric part of the Mandel stress
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real(pReal) :: &
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dot_gamma, & !< strainrate
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norm_Mp_dev, & !< norm of the deviatoric part of the Mandel stress
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squarenorm_Mp_dev !< square of the norm of the deviatoric part of the Mandel stress
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integer :: &
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k, l, m, n
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associate(prm => param(instance), stt => state(instance))
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Mp_dev = math_deviatoric33(Mp)
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squarenorm_Mp_dev = math_mul33xx33(Mp_dev,Mp_dev)
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norm_Mp_dev = sqrt(squarenorm_Mp_dev)
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if (norm_Mp_dev > 0.0_pReal) then
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dot_gamma = prm%dot_gamma_0 * (sqrt(1.5_pReal) * norm_Mp_dev/(prm%M*stt%xi(of))) **prm%n
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Lp = dot_gamma/prm%M * Mp_dev/norm_Mp_dev
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#ifdef DEBUG
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if (iand(debug_level(debug_constitutive), debug_levelExtensive) /= 0 &
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.and. (of == prm%of_debug .or. .not. iand(debug_level(debug_constitutive),debug_levelSelective) /= 0)) then
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write(6,'(/,a,/,3(12x,3(f12.4,1x)/))') '<< CONST isotropic >> Tstar (dev) / MPa', &
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transpose(Mp_dev)*1.0e-6_pReal
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write(6,'(/,a,/,f12.5)') '<< CONST isotropic >> norm Tstar / MPa', norm_Mp_dev*1.0e-6_pReal
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write(6,'(/,a,/,f12.5)') '<< CONST isotropic >> gdot', dot_gamma
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end if
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#endif
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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) = (prm%n-1.0_pReal) * Mp_dev(k,l)*Mp_dev(m,n) / squarenorm_Mp_dev
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forall (k=1:3,l=1:3) &
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dLp_dMp(k,l,k,l) = dLp_dMp(k,l,k,l) + 1.0_pReal
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forall (k=1:3,m=1:3) &
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dLp_dMp(k,k,m,m) = dLp_dMp(k,k,m,m) - 1.0_pReal/3.0_pReal
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dLp_dMp = dot_gamma / prm%M * dLp_dMp / norm_Mp_dev
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else
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Lp = 0.0_pReal
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dLp_dMp = 0.0_pReal
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end if
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end associate
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end subroutine plastic_isotropic_LpAndItsTangent
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!--------------------------------------------------------------------------------------------------
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!> @brief calculates plastic velocity gradient and its tangent
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!--------------------------------------------------------------------------------------------------
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subroutine plastic_isotropic_LiAndItsTangent(Li,dLi_dMi,Mi,instance,of)
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real(pReal), dimension(3,3), intent(out) :: &
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Li !< inleastic velocity gradient
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real(pReal), dimension(3,3,3,3), intent(out) :: &
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dLi_dMi !< derivative of Li with respect to Mandel stress
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real(pReal), dimension(3,3), intent(in) :: &
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Mi !< Mandel stress
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integer, intent(in) :: &
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instance, &
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of
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real(pReal) :: &
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tr !< trace of spherical part of Mandel stress (= 3 x pressure)
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integer :: &
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k, l, m, n
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associate(prm => param(instance), stt => state(instance))
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tr=math_trace33(math_spherical33(Mi))
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if (prm%dilatation .and. abs(tr) > 0.0_pReal) then ! no stress or J2 plasticity --> Li and its derivative are zero
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Li = math_I3 &
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* prm%dot_gamma_0/prm%M * (3.0_pReal*prm%M*stt%xi(of))**(-prm%n) &
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* tr * abs(tr)**(prm%n-1.0_pReal)
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#ifdef DEBUG
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if (iand(debug_level(debug_constitutive), debug_levelExtensive) /= 0 &
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.and. (of == prm%of_debug .or. .not. iand(debug_level(debug_constitutive),debug_levelSelective) /= 0)) then
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write(6,'(/,a,/,f12.5)') '<< CONST isotropic >> pressure / MPa', tr/3.0_pReal*1.0e-6_pReal
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write(6,'(/,a,/,f12.5)') '<< CONST isotropic >> gdot', prm%dot_gamma_0 * (3.0_pReal*prm%M*stt%xi(of))**(-prm%n) &
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* tr * abs(tr)**(prm%n-1.0_pReal)
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end if
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#endif
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forall (k=1:3,l=1:3,m=1:3,n=1:3) &
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dLi_dMi(k,l,m,n) = prm%n / tr * Li(k,l) * math_I3(m,n)
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else
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Li = 0.0_pReal
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dLi_dMi = 0.0_pReal
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endif
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end associate
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end subroutine plastic_isotropic_LiAndItsTangent
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!--------------------------------------------------------------------------------------------------
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!> @brief calculates the rate of change of microstructure
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!--------------------------------------------------------------------------------------------------
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subroutine plastic_isotropic_dotState(Mp,instance,of)
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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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instance, &
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of
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real(pReal) :: &
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dot_gamma, & !< strainrate
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xi_inf_star, & !< saturation xi
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norm_Mp !< norm of the (deviatoric) Mandel stress
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associate(prm => param(instance), stt => state(instance), dot => dotState(instance))
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if (prm%dilatation) then
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norm_Mp = sqrt(math_mul33xx33(Mp,Mp))
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else
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norm_Mp = sqrt(math_mul33xx33(math_deviatoric33(Mp),math_deviatoric33(Mp)))
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endif
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dot_gamma = prm%dot_gamma_0 * (sqrt(1.5_pReal) * norm_Mp /(prm%M*stt%xi(of))) **prm%n
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if (dot_gamma > 1e-12_pReal) then
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if (dEq0(prm%c_1)) then
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xi_inf_star = prm%xi_inf
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else
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xi_inf_star = prm%xi_inf &
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+ asinh( (dot_gamma / prm%c_1)**(1.0_pReal / prm%c_2))**(1.0_pReal / prm%c_3) &
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/ prm%c_4 * (dot_gamma / prm%dot_gamma_0)**(1.0_pReal / prm%n)
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endif
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dot%xi(of) = dot_gamma &
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* ( prm%h0 + prm%h_ln * log(dot_gamma) ) &
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* abs( 1.0_pReal - stt%xi(of)/xi_inf_star )**prm%a &
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* sign(1.0_pReal, 1.0_pReal - stt%xi(of)/xi_inf_star)
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else
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dot%xi(of) = 0.0_pReal
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endif
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dot%gamma(of) = dot_gamma ! ToDo: not really used
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end associate
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end subroutine plastic_isotropic_dotState
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!--------------------------------------------------------------------------------------------------
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!> @brief writes results to HDF5 output file
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!--------------------------------------------------------------------------------------------------
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subroutine plastic_isotropic_results(instance,group)
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integer, intent(in) :: instance
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character(len=*), intent(in) :: group
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integer :: o
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associate(prm => param(instance), stt => state(instance))
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outputsLoop: do o = 1,size(prm%outputID)
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select case(prm%outputID(o))
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case (xi_ID)
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call results_writeDataset(group,stt%xi,'xi','resistance against plastic flow','Pa')
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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_isotropic_results
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end module plastic_isotropic
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