The continuous-discontinuous cellular automaton method for elastodynamic crack problems

The continuous-discontinuous cellular automaton method for elastodynamic crack problems
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弹动力裂纹问题的连续-不连续元胞自动机方法

DOI:
10.1016/j.engfracmech.2018.10.025
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发表时间:
2018-12
影响因子:
5.4
通讯作者:
Li Shao-Jun
Li Shao-Jun
中科院分区:
工程技术2区
文献类型:
--
作者:
Yan Fei;Pan Peng-Zhi;Feng Xia-Ting;Li Shao-Jun

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本文进一步发展了最近提出的连续-不连续元胞自动机方法(CDCA),用于求解二维弹性固体的弹性动力学问题。一个连续到不连续丰富的功能技术开发的弹性动力学和细胞自动机配方相结合,细胞自动机理论的弹性动力学,其中快速自适应更新规则的细胞和它的邻居,并提出了时域CDCA。该方法中裂纹与整体网格无关,整个计算过程不需要组合全局矩阵。用Newmark方法离散单元的时间相关方程,并用元胞自动机方法快速求解。为了分析弹性固体在动载荷作用下的断裂行为,利用相互作用积分法得到了混合型动应力强度因子。通过弹性动力学问题的数值算例验证了本文方法的精度和有效性,并用解析法和其它方法的解验证了本文方法的高精度。
In this paper, the recently proposed continuous-discontinuous cellular automaton method (CDCA) is further developed for elastodynamic problems in 2D elastic solids. A continuity-to-discontinuity enriched function technique is developed for elastodynamics and combined with a cellular automaton formulation; the cellular automaton theory for elastodynamics, in which fast adaptive updating rules for the cell and its neighbors are developed, and the time domain CDCA are proposed. In this method, the cracks are independent of the integral meshes, and no assembled global matrix is needed for the whole process. Time-dependent equations for the cells are discretized by the Newmark method, and rapidly solved by the cellular automaton method. To analyze the fracture behaviors of elastic solids with dynamic loads, mixed-mode dynamic stress intensity factors are obtained by the interaction integral method. Some numerical examples for elastodynamic problems are studied to validate the accuracy and efficiency of the present method, and solutions from analytical method and some other methods are employed to show the high accuracy of the CDCA.
二维弹性固体稳态动态裂纹问题的基于奇异边缘的平滑有限元方法
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