Visco-Cosserat periporomechanics for dynamic shear bands and crack branching in porous media

TL;DR

This paper introduces a Cosserat periporomechanics framework incorporating micro-structure based length scales to model dynamic shear bands and crack branching in porous media, using a stabilized energy-based formulation and meshfree numerical methods.

Contribution

It formulates a novel Cosserat periporomechanics paradigm with micro-structure length scales for porous media, including a stabilized constitutive model and explicit meshfree implementation.

Findings

Successfully models shear banding bifurcation.

Accurately predicts dynamic crack branching.

Demonstrates effectiveness through benchmark examples.

Abstract

Periporomechanmics is a strong nonlocal framework for modeling the mechanics and physics of variably saturated porous media with evolving discontinuities. In periporomechanics, the horizon serves as a mathematical nonlocal parameter that lacks a precise physical meaning. In this article, as a new contribution we formulate a Cosserat periporomechanics paradigm for modeling dynamic shear banding and crack branching in dry porous media incorporating a micro-structure based length scale. In this micro-periporomechanics framework, each material point has both translational and rotational degrees of freedom in line with the Cosserat continuum theory. We formulate a stabilized Cosserat constitutive correspondence principle via the energy method through which classical viscous material models for porous media can be used in the proposed Cosserat periporomechanics. We have numerically implemented the micro-periporomechanics model through an explicit Lagrangian meshfree algorithm for dynamic problems. Two benchmark numerical examples are presented to test the computational micro-periporomechanics paradigm in modeling shear bands and mode-I cracks. We then present two numerical examples to show the efficacy of the proposed micro-periporomechanics for modeling the characteristics of shear banding bifurcation and dynamic crack branching in dry porous media.