19 Apr 2021

19 Apr 2021

Review status: a revised version of this preprint is currently under review for the journal SE.

A new finite element approach to model microscale strain localization within olivine aggregates

Jean Furstoss1,2,a, Carole Petit1, Clément Ganino1, Marc Bernacki1, and Daniel Pino-Muñoz2 Jean Furstoss et al.
  • 1Université Nice Côte d’Azur, CNRS, OCA, IRD, Géoazur, France
  • 2MINES ParisTech, PSL Research University, CEMEF-Centre de mise en forme des matériaux, CNRS UMR 7635, France
  • anow at: Université de Lille

Abstract. This paper presents a new mesoscopic full field approach for the modelling of microstructural evolutions and mechanical behavior of olivine aggregates. The mechanical framework is based on a reduced crystal plasticity (CP) formulation which is adapted to account for non-dislocation glide strain-accommodating mechanisms in olivine polycrystals. This mechanical description is coupled with a mixed velocity/pressure finite element (FE) formulation through a classical crystal plasticity finite element method (CPFEM) approach. The microstrutural evolutions, such as grain boundary migration and dynamic recrystallization, are also computed within a FE framework using an implicit description of the polycrystal through the level-set approach.

This numerical framework is used to study the strain localization, at the polycrystal scale, on different types of pre-existing shear zones for thermomechanical conditions relevant to laboratory experiments. We show that both fine-grained and crystallographic textured pre-existing bands favor strain localization at the sample scale. The combination of both processes has a large effect on strain localization, which emphasizes the importance of these two microstructural characteristics (texture and grain size) on the mechanical behavior of the aggregate.

Jean Furstoss et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on se-2021-30', Thomas Poulet, 12 May 2021
    • AC2: 'Reply on RC1', Jean Furstoss, 21 Jun 2021
  • RC2: 'Comment on se-2021-30', Anonymous Referee #2, 20 May 2021
    • AC1: 'Reply on RC2', Jean Furstoss, 21 Jun 2021

Jean Furstoss et al.

Jean Furstoss et al.


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Short summary
In the first part of this article, we present a new methodology that we have developed to model the deformation and the microstructural evolutions of olivine rocks, which compose the main part of the Earth upper mantle. In a second part, using this methodology we show that microstructural features such as small grain sizes and preferential grain orientations can localize strain at the same intensity and can act together to produce an even stronger strain localization.