A new type of numerical experiment on the spatial and temporal patterns of localization of deformation in a material with a coupling of grain size and rheology

Mark W. Jessell*, Esteban Siebert, Paul D. Bons, Lynn Evans, Sandra Piazolo

*Corresponding author for this work

    Research output: Contribution to journalArticle

    36 Citations (Scopus)

    Abstract

    The patterns of localization of deformation in recrystallising materials are investigated via a series of two-dimensional grain-scale numerical simulations. These simulations couple a grain-size and strain dependant viscous rheology with grain size reduction and grain growth processes. The simulations are able to predict the mechanical, microstructural and strain evolution of the polycrystals to moderate strain, and allow us to examine the nature of the time dependent feedback between mechanical and microstructural behavior. It was found that significant strain localization occurred only when the grain size dependence of the viscosity was non-linear, and was greatly enhanced by the activity of the grain-size modifying processes. The intensity and location of the zone of strain localization varied spatially and temporally, and displayed two length and time scales, with the result that the finite strain state showed a much broader, and hence less intense, zone of localized deformation than the instantaneous state.

    Original languageEnglish
    Pages (from-to)309-326
    Number of pages18
    JournalEarth and Planetary Science Letters
    Volume239
    Issue number3-4
    DOIs
    Publication statusPublished - 15 Nov 2005

    Keywords

    • Localization
    • Micro-mechanics
    • Recrystallisation
    • Simulation

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