A bond-level energy-based peridynamics for mixed-mode fracture in rocks

• DOI: 10.1016/j.cma.2023.116169
• Publication Date: 2023-06-26T09:30:59Z
• Authors: Yunteng Wang; Wei Wu
• Keywords: Energy-based failure criteria; Rock materials; Ordindary state-based peridynamics; Mixed-mode fracture; Nonlocal stress tensor

This paper deals with the numerical simulation of initiation and propagation of mixed mode fracture in rocks. A bond-level energy-based peridynamic model is developed by introducing a dilatation function to capture both volumetric and deviatoric deformations. We proceed to define the nonlocal stresses to obtain the isotropic and deviatoric forces commensurate with the deformations. We then come up with a new failure model to link computational peridynamics with some phenomenological failure criteria, which is highly relevant for both brittle and quasi-brittle rocks. Finally, several numerical examples of mixed-mode fractures are presented to show the performance of our model.