The ephemeral development of C′ shear bands: A numerical modelling approach

The ephemeral development of C′ shear bands: A numerical modelling approach

DOI: DOI10.25914/whbg-hd74

Creators:
Melanie Finch P.D. Bons Florian Steinbach Albert Griera Artigas Maria-Gema Llorens E. Gomez-Rivas H. Ran T. de Riese

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.

Model animation

Research Tags

None specified.

Associated Publication

The ephemeral development of C′ shear bands: A numerical modelling approach
M.A. Finch, P.D. Bons, F. Steinbach, A. Griera, M.-G. Llorens, E. Gomez-Rivas, H. Ran, T. de Riese
— 2020-10
DOI10.1016/j.jsg.2020.104091

Abstract

Graphic abstract

Compute Tags

None specified.

Software

Elle Numerical Simulation Platform

Model Setup

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.

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.

Citation

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

Licence

CC-BY-4.0

Funders

  • Alexander von Humboldt Foundation
  • Ministerio de Ciencia, Innovación y Universidades