Finch 2024 cprime

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+---
+templateKey: model
+slug: finch-2024-cprime
+title: 'The ephemeral development of C′ shear bands: A numerical modelling approach'
+date: '2024-10-29T02:36:04.000Z'
+featuredpost:
+for_codes:
+  - 370401
+status:
+  - completed
+doi: https://doi.org/10.25914/whbg-hd74
+url: https://mate.science//models/finch-2024-cprime
+creditText: 'Finch, M., Bons, P.D.., Steinbach, F., Griera Artigas, A., Llorens, M.,
+  Gomez-Rivas, E.., Ran, H.., & de Riese, T.. (2024). The ephemeral development of
+  C′ shear bands: A numerical modelling approach [Data set]. AuScope, National Computational
+  Infrastructure. https://doi.org/whbg-hd74'
+software:
+  name: Elle Numerical Simulation Platform
+  doi: https://elle.ws/
+  url_source: https://sourceforge.net/p/elle/git/ci/master/tree/
+licence:
+  licence_url: https://creativecommons.org/licenses/by/4.0/legalcode
+  licence_image: ../../../img/licence/by.png
+  description: Creative Commons Attribution 4.0 International
+  licence_file: license.txt
+submitter:
+  name: Melanie
+  family_name: Finch
+  ORCID: https://orcid.org/0000-0001-9699-2769
+creators:
+  - name: Melanie
+    family_name: Finch
+    ORCID: 0000-0001-9699-2769
+  - name: Paul D.
+    family_name: Bons
+    ORCID: 0000-0002-6469-3526
+  - name: Florian
+    family_name: Steinbach
+    ORCID: Invalid ORCiD ID
+  - name: Albert
+    family_name: Griera Artigas
+    ORCID: 0000-0003-4598-8385
+  - name: Maria-Gema
+    family_name: Llorens
+    ORCID: 0000-0002-6148-2600
+  - name: Enrique
+    family_name: Gomez-Rivas
+    ORCID: 0000-0002-1317-6289
+  - name: Hao
+    family_name: Ran
+    ORCID: 0000-0002-8639-3890
+  - name: Tamara
+    family_name: de Riese
+    ORCID: 0000-0001-5828-8711
+associated_publication:
+  title: 'The ephemeral development of C′ shear bands: A numerical modelling approach'
+  url: http://dx.doi.org/10.1016/j.jsg.2020.104091
+  doi: 10.1016/j.jsg.2020.104091
+compute_info:
+  name: ''
+  organisation: ''
+  url: ''
+  doi: ''
+research_tags: []
+compute_tags:
+  - VPFFT
+  - Elle
+funder:
+  - name: Alexander von Humboldt Foundation
+    doi: https://ror.org/012kf4317
+  - name: Ministerio de Ciencia, Innovación y Universidades
+    doi: https://ror.org/05r0vyz12
+funding:
+  - name: Ministerio de Ciencia, Innovación y Universidades
+    doi: https://ror.org/05r0vyz12
+    number_id: RYC2018-026335-I
+abstract: ''
+description: "This model simulates the development of C' shear bands in ductile shear
+  zones. The model begins with an equigranular texture of three phases: a strong phase
+  (e.g., feldspar) an intermediate-strength phase (e.g., quartz) and an anisotropic
+  weak phase (e.g., mica). Dextral shearing stretches and rotates the microstructure,
+  forming S-C fabric, asymmetric folds and C' shear bands."
+images:
+  landing_image:
+    src: ./graphics/Fig  3.png
+    caption: 'Stages of microstructural development in a model with 15% weak phase
+      (black) and a medium phase strength contrast. (a) Starting microstructure, (b)
+      stage 1: grain elongation and rotation. Note the distribution of maximum strain
+      rate (red arrows) localised to tips of WP grains that are parallel to the C
+      plane, (c) stage 2: S-C fabric development. Stress is highest in the IP+SP adjacent
+      to high strain rate layers of interconnected WP (red and orange arrows). (d)
+      stage 3: shear band development and strain partitioning. Maximum stress in the
+      model is in the gap in the shear band (red arrow). Green arrows highlight areas
+      that have been asymmetrically folded (c.f. Fig. 1a). The first column shows
+      the grain microstructure, the second column shows the normalised von Mises strain
+      rate and the third column shows the von Mises stress. Images in the same row
+      correspond to the same model and step.'
+  graphic_abstract:
+    src: ./graphics/Fig  5.png
+    caption: The formation of C' shear bands by the rotation of a C plane forwards
+      due to high strain rate in the shear band and high stress at the tip of the
+      shear band. (a) Discontinuous shear band with section parallel to the SZB at
+      high strain rate (red arrow) and high stress in the IP+SP region at the end
+      of the shear band (orange arrow). (b) A low strain rate section in the shear
+      band is bracketed on either side by high strain rate sections (red arrows) and
+      begins to rotate forwards. (c) C' shear band forms in low strain rate section
+      (red dashed line). (d) Strain rate reduces in the shear band and the C' shear
+      band has rotated back into parallelism with the SZB and C planes. The first
+      column shows the grain microstructure, the second column shows the normalised
+      von Mises strain rate and the third column shows the von Mises stress. Model
+      shown contains 15% weak phase and a high phase strength contrast. Images in
+      the same row correspond to the same model and step.
+  model_setup:
+    src: ./graphics/Fig 2.png
+    caption: 'Basic process of microstructure simulation. (a) The starting microstructure
+      consists of three grain types that undergo one increment of γ = 0.02 dextral
+      shear. (b) The microstructure is deformed with wrapping boundaries. (c) The
+      microstructure is repositioned back to a square before the next increment of
+      strain. (d) Zoom in of (a) showing the three flynn (grain) types: strong phase
+      (SP), intermediate-strength phase (IP), and weak phase (WP). (e) Zoom-in of
+      (d) showing that flynn grain boundaries are defined by double (blue) and triple
+      (red) bnodes joined by straight lines. An additional grid of unconnected nodes
+      (unodes, black) is overlain on flynns and stores state variables and flynn properties.'
+animation:
+  src: ./graphics/
+  caption: ''
+model_setup_info:
+  url: ''
+  summary: "A three-phase microstructure was used with 15% weak phase (WP), 42.5%
+    intermediate-strength phase (IP) and 42.5% strong phase (SP). The starting model
+    was square and defined by 2,748 equant grains with a random distribution of the
+    three phases. Velocity boundary conditions with constant strain rate were applied
+    with top-to-the-right (dextral) simple shear in increments of Δγ = 0.02, up to
+    a finite shear strain of γ=18 in 900 steps. After each deformation step, the model
+    was repositioned to the initial square unit cell and grain properties mapped back
+    on to the grid before the next deformation step. A power-law viscous rheology\
+    \  was employed with n = 3.\r\nEach phase was associated with a mineral model
+    that specified the slip systems and their effective strength or resistance to
+    shear. The mineral models employed attempted to broadly approximate the most important
+    features of mica (WP), quartz (IP), and feldspar (SP) in order to more closely
+    correspond to previous experimental work. To model the WP we used a mineral model
+    with hexagonal symmetry and three slip systems (basal, prismatic, and pyramidal)
+    because, although mica is monoclinic, it is pseudohexagonal and its most important
+    mechanical feature is an easy glide plane since shear in mica is easier parallel
+    to the basal plane than in any other direction. Accordingly we set  the basal
+    plane of the WP to one tenth of the non-basal WP planes, producing a mechanically
+    anisotropic WP. Feldspar is also pseudohexagonal, so we employed a hexagonal mineral
+    model for the SP, but with all slip systems at the same effective strength. For
+    the IP we used the crystal model of quartz with four slip systems (basal, prismatic,
+    pyramidal <a> and pyramidal <c+a>) and gave the effective strength of all four
+    slip systems the same value, making the IP effectively mechanically isotropic.
+    The IP was 25x stronger than the WP basal plane and the SP was 2x stronger than
+    the IP."
+model_files:
+  url: ''
+  notes: The starting microstructure for the model is an .Elle file that can be viewed
+    and edited in notepad or similar. The microstructure can be viewed with the showelle
+    program. To run the simulation the program Elle can be downloaded from elle.ws.
+  file_tree: ''
+  existing_identifier: ''
+  nci_file_path: 
+    https://thredds.nci.org.au/thredds/catalog/nm08/MATE/finch-2024-cprime/catalog.html
+  include: true
+dataset:
+  url: ''
+  notes: Output data consists of 900 files that are 21 Mb each and an avi movie that
+    is 80 Mb
+  existing_identifier: ''
+  nci_file_path: 
+    https://thredds.nci.org.au/thredds/catalog/nm08/MATE/finch-2024-cprime/catalog.html
+  include: true
+metadataFile: ro-crate-metadata.json
+---