Preprints
https://doi.org/10.5194/tc-2020-354
https://doi.org/10.5194/tc-2020-354

  02 Feb 2021

02 Feb 2021

Review status: this preprint is currently under review for the journal TC.

A generalized stress correction scheme for the MEB rheology: impact on the fracture angles and deformations

Mathieu Plante and L. Bruno Tremblay Mathieu Plante and L. Bruno Tremblay
  • Department of Atmospheric and Oceanic Sciences, McGill University, Montréal, Québec, Canada

Abstract. A generalized damage parameterization is developed for the Maxwell Elasto-Brittle (MEB) rheology that reduces the growth of residual errors associated with the correction of super-critical stresses. In the generalized stress correction, a decohesive stress tensor is used to bring the super-critical stresses back on the yield curve based on any correction path. The sensitivity of the simulated material behaviour to the magnitude of the decohesive stress tensor is investigated in uniaxial compression simulations. Results show that while the decohesive stress tensor influences the short-term fracture deformation and orientation, the long-term post-fracture behaviour remains unchanged. Divergence first occurs when the elastic response is dominant followed by post-fracture shear and convergence when the viscous response dominates – contrary to laboratory experiment of granular flow and satellite imagery in the Arctic. The post-fracture deformations are shown to be dissociated from the fracture process itself, an important difference with classical Viscous Plastic (VP) models. Using the generalized damage parameterization together with a stress correction path normal to the yield curve brings the simulated fracture angles closer to observations (from 40–50° to 35–45°, compared to 20–30° in observations) and reduces the growth of errors sufficiently for the production of longer-term simulations.

Mathieu Plante and L. Bruno Tremblay

Status: open (until 30 Mar 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Mathieu Plante and L. Bruno Tremblay

Mathieu Plante and L. Bruno Tremblay

Viewed

Total article views: 140 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
107 30 3 140 0 1
  • HTML: 107
  • PDF: 30
  • XML: 3
  • Total: 140
  • BibTeX: 0
  • EndNote: 1
Views and downloads (calculated since 02 Feb 2021)
Cumulative views and downloads (calculated since 02 Feb 2021)

Viewed (geographical distribution)

Total article views: 135 (including HTML, PDF, and XML) Thereof 135 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 01 Mar 2021
Download
Short summary
We propose a generalized form for the damage parameterization such that super-critical stresses can return to the yield with different final sub-critical stress states. In uniaxial compression simulations, the generalization improves the orientation of sea-ice fractures and reduces the growth of numerical errors. Shear and convergence deformations however remain predominant along the fractures, contrary to observations, and calls for a modification of the post-fracture viscosity formulation.