Modelling multiple cohesive crack propagation using a finite element-scaled boundary finite element coupled method
Modelling multiple cohesive crack propagation using a finite element-scaled boundary finite element coupled method
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DOI：
10.1016/j.enganabound.2009.01.006
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发表时间：
2009-07-01
影响因子：
3.3
通讯作者：
Yang, Z. J.
中科院分区：
文献类型：
--
作者：
Ooi, E. T.;Yang, Z. J.
本文将有限元-比例边界有限元耦合方法推广到混凝土多裂纹扩展问题。混凝土的体积和断裂过程区分别采用SBFEM和非线性粘结界面有限元（CIE）。当裂纹扩展时，CIE自动插入SBFEM网格中。以前设计的单裂纹扩展的算法被增强到多裂纹模型问题，并允许裂纹在未开裂的SBFEM网格中开始。它还解决了裂纹扩展从一个子域到另一个，作为一个粗SBFEM网格划分的结果，需要一些混合模式的问题。当裂纹尖端的I型应力强度因子的符号从负变为正时，SBFEM网格中的每个裂纹扩展。它的传播角确定使用线弹性断裂力学准则。三个混凝土梁涉及多裂纹扩展建模。预测的裂纹扩展模式和载荷-位移曲线与文献报道的数据吻合良好。(C)2009爱思唯尔有限公司保留所有权利。
This paper presents an extension of the recently-developed finite element-scaled boundary finite element (FEM-SBFEM) Coupled method to model multiple crack propagation in concrete. The concrete bulk and fracture process zones are modelled using SBFEM and nonlinear cohesive interface finite elements (CIEs), respectively. The CIEs are automatically inserted into the SBFEM mesh as the cracks propagate. The algorithm previously devised for single crack propagation is augmented to model problems with multiple cracks and to allow cracks to initiate in an un-cracked SBFEM mesh. It also addresses crack propagation from one subdomain into another, as a result of partitioning a coarse SBFEM mesh, required for some mixed-mode problems. Each crack in the SBFEM mesh propagates when the sign of the Mode-I stress intensity factor at the crack tip turns positive from negative. Its propagation angle is determined using linear elastic fracture mechanics criteria. Three concrete beams involving multiple crack propagation are modelled. The predicted crack propagation patterns and load-displacement curves are in good agreement with data reported in literature. (C) 2009 Elsevier Ltd. All rights reserved.