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Implementation of extrinsic cohesive zone model (ECZM) in 2D finite-discrete element method (FDEM) using node binding scheme

Weibing Cai, Ke Gao Orcid Logo, Shugang Ai, Min Wang Orcid Logo, Yuntian Feng Orcid Logo

Computers and Geotechnics, Volume: 159, Start page: 105470

Swansea University Author: Yuntian Feng Orcid Logo

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DOI (Published version): 10.1016/j.compgeo.2023.105470

Abstract

The combined finite-discrete element method (FDEM) has been widely used for rock fracturing simulations. Conventionally, FDEM is realized using the intrinsic cohesive zone model (ICZM); however, it has the drawback of artificial compliance and high computational expense. As a complement, the extrins...

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Published in: Computers and Geotechnics
ISSN: 0266-352X
Published: Elsevier BV 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa63290
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Abstract: The combined finite-discrete element method (FDEM) has been widely used for rock fracturing simulations. Conventionally, FDEM is realized using the intrinsic cohesive zone model (ICZM); however, it has the drawback of artificial compliance and high computational expense. As a complement, the extrinsic cohesive zone model (ECZM) is seen to be realized in FDEM recently, whereas the node splitting scheme utilized is cumbersome. Here, within the framework of ICZM-based FDEM, we propose a node binding scheme to efficiently bind the pre-discretized finite elements and thus guarantee the continuum behavior of materials in the elastic stage. The yield surfaces, controlled by ECZM, are dynamically embedded by invoking the pre-inserted cohesive elements. The effectiveness and efficiency of the proposed approach are validated and tested by performing a suite of numerical experiments. Compared with ICZM-based FDEM, the proposed approach can correctly capture material deformation and reduce the computation cost. In contrast to the existing ECZM-based FDEM, the proposed approach can overcome the frequent and complex element topology updating. This work provides a novel perspective that fully inherits the advantages of both ICZM and ECZM, but circumvents their shortcomings, which guarantees a more efficient and effective simulation of brittle material evolution from continuum to discontinuum.
College: Faculty of Science and Engineering
Funders: This work is supported by the Shenzhen Science and Technology Program (JCYJ20220530113612028) and the Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology (2022B1212010002).
Start Page: 105470

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