frozen and variant are 1D again
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achalhp
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README.md
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README.md
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@ -2,8 +2,26 @@
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Visit [damask.mpie.de](https://damask.mpie.de) for installation and usage instructions
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## DAMASK_EICMD
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This is a DAMASK fork with implementation of the "Discrete Deformation Twinning Model" based on work done by Dr. Satyapriya Gupta and Dr. Philip Eisenlohr at MSU.
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### The Discrete Deformation Twinning Model
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The aim of this model is to accurately match experimental observations of deformation twinning while remaining computationally efficient compared to physics-based phase field models.
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* We introduce stochasticity for the nucleation and growth events of twinning through random sampling, similar to Monte Carlo Methods.
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* The ease or difficulty of a twinning event is controlled by adjusting the frequency of sampling.
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* At each voxel, the state of twinning is treated as a discrete quantity, unlike the approach based on diffused volume fraction method.
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* The kinetics of twinning occur in the form of a “jump,” rather than following a rate equation as in the “pseudo-slip” approach.
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* The jumped state is evaluated using the correspondence matrix from Niewczas, Acta Materialia, 2010.
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## Contact Information
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(
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EICMD Team, IIT Dharwad
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https://sites.google.com/view/eicmd/home
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)
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Max-Planck-Institut für Eisenforschung GmbH
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Max-Planck-Str. 1
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40237 Düsseldorf
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@ -12,4 +30,3 @@ Germany
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damask@mpie.de
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https://damask.mpie.de
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https://git.damask.mpie.de
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@ -51,7 +51,7 @@ type :: tParameters
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real(pReal), allocatable, dimension(:,:,:) :: &
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P_sl, &
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P_tw, &
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P_tw, & !< Schmid matrix tiwn
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P_nS_pos, &
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P_nS_neg, &
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CorrespondanceMatrix !< Achal
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@ -83,12 +83,12 @@ type :: tPhenopowerlawState
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gamma_sl, &
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gamma_tw, &
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f_twin, & !< Twin volume fraction
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fmc_twin, & !< Achal, To control sampling frequency
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fmc_twin!, & !< Achal, To control sampling frequency
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!variant_twin, &
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!frozen
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real(pReal), pointer, dimension(:) :: &
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variant_twin, &
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frozen
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!real(pReal), pointer, dimension(:) :: &
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! variant_twin, &
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! frozen
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end type tPhenopowerlawState
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!--------------------------------------------------------------------------------------------------
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@ -142,7 +142,6 @@ allocate(param(phases%length))
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allocate(indexDotState(phases%length))
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allocate(state(phases%length))
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allocate(deltastate(phases%length)) !< Achal
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!allocate(dotState(phases%length)) !< Achal dot allocate
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do ph = 1, phases%length
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if (.not. myPlasticity(ph)) cycle
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@ -267,12 +266,12 @@ do ph = 1, phases%length
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+ size(['xi_tw ','gamma_tw','f_twin ']) * prm%sum_N_tw !Achal
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sizeDeltaState = size(['f_twin ','fmc_twin']) * prm%sum_N_tw & !Achal
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+ size(['variant_twin','frozen ']) * prm%sum_N_tw
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+ size(['variant_twin','frozen '])
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sizeState = 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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+ size(['f_twin ','fmc_twin']) * prm%sum_N_tw &
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+ size(['variant_twin','frozen ']) * prm%sum_N_tw !Achal
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+ size(['variant_twin','frozen ']) !Achal
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@ -334,10 +333,10 @@ do ph = 1, phases%length
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plasticState(ph)%atol(startIndex:endIndex) = pl%get_asFloat('atol_gamma',defaultVal=1.0e-6_pReal)
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startIndex = endIndex + 1
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endIndex = endIndex + prm%sum_N_tw
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stt%frozen => plasticState(ph)%state(startIndex:endIndex,:)
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endIndex = endIndex + 1
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stt%frozen => plasticState(ph)%state(startIndex,:)
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stt%frozen = 0.0_pReal-1.0_pReal
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dlt%frozen => plasticState(ph)%deltaState(startIndex-o:endIndex-o,:)
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dlt%frozen => plasticState(ph)%deltaState(startIndex-o,:)
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plasticState(ph)%atol(startIndex:endIndex) = pl%get_asFloat('atol_gamma',defaultVal=1.0e-6_pReal)
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startIndex = endIndex + 1
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@ -347,9 +346,10 @@ do ph = 1, phases%length
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plasticState(ph)%atol(startIndex:endIndex) = pl%get_asFloat('atol_gamma',defaultVal=1.0e-6_pReal)
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startIndex = endIndex + 1
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endIndex = endIndex + prm%sum_N_tw
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stt%variant_twin => plasticState(ph)%state(startIndex:endIndex,:)
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dlt%variant_twin => plasticState(ph)%deltaState(startIndex-o:endIndex-o,:)
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endIndex = endIndex + 1
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stt%variant_twin => plasticState(ph)%state(startIndex,:)
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stt%variant_twin = 0.0_pReal
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dlt%variant_twin => plasticState(ph)%deltaState(startIndex-o,:)
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plasticState(ph)%atol(startIndex:endIndex) = 0.0_pReal
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@ -526,6 +526,7 @@ associate(prm => param(ph), stt => state(ph), dot => dotState(ph), dlt => deltas
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neighbors: do n = 1,nIPneighbors
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neighbor_e = geom(ph)%IPneighborhood(1,n,en)
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!write(6,*) 'neighbor_e', neighbor_e
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neighbor_i = geom(ph)%IPneighborhood(2,n,en)
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neighbor_me = material_phaseEntry(1,(neighbor_e-1)*discretization_nIPs + neighbor_i) !Neighbour offset
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neighbor_phase = material_phaseID(1,(neighbor_e-1)*discretization_nIPs + neighbor_i)
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@ -554,8 +555,8 @@ associate(prm => param(ph), stt => state(ph), dot => dotState(ph), dlt => deltas
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deltaFp = prm%CorrespondanceMatrix(:,:,twin_var)
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dlt%f_twin(:,en) = 0.0_pReal - stt%f_twin(:,en)
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dlt%fmc_twin(:,en) = 0.0_pReal - stt%fmc_twin(:,en)
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dlt%frozen(:,en) = 1.0_pReal - stt%frozen(:,en)
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dlt%variant_twin(:,en) = twin_var - stt%variant_twin(:,en) ! Achal LHS is real, RHS integer
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dlt%frozen(en) = 1.0_pReal - stt%frozen(en)
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dlt%variant_twin(en) = twin_var - stt%variant_twin(en) ! Achal LHS is real, RHS integer ! why this equation?
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end if Success_Nucleation
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endif Ability_Nucleation
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@ -579,8 +580,8 @@ associate(dlt => deltastate(ph))
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dlt%f_twin(:,en) = 0.0_pReal
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dlt%fmc_twin(:,en) = 0.0_pReal
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dlt%variant_twin(:,en) = 0.0_pReal
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dlt%frozen(:,en) = 0.0_pReal
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!dlt%variant_twin(en) = 1.0_pReal
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!dlt%frozen(en) = 1.0_pReal
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end associate
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@ -623,12 +624,12 @@ associate(prm => param(ph), stt => state(ph), dlt=>deltastate(ph))
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'volume fraction','1',prm%systems_tw) !Achal
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case('variant_twin')
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call results_writeDataset(dlt%variant_twin,group,trim(prm%output(ou)), &
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'twin variant','1', prm%systems_tw) !Achal
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call results_writeDataset(stt%variant_twin,group,trim(prm%output(ou)), &
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'twin variant','1') !Achal
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case('fbinary_twin')
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call results_writeDataset(dlt%frozen,group,trim(prm%output(ou)), &
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'binary twin flag','1',prm%systems_tw) !Achal
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call results_writeDataset(stt%frozen,group,trim(prm%output(ou)), &
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'binary twin flag','1') !Achal
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end select
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end do
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