In this study, a computational framework is proposed to investigate multiscale dynamic fracture phenomena in materials with microstructures. The micro‐ and macro‐scales of a composite material are integrated by introducing an adaptive microstructure representation. Then, the far and local fields are simultaneously computed using the equation of motion, which satisfies the boundary conditions between the two fields. Cohesive surface elements are dynamically inserted where and when needed, and the Park‐Paulino‐Roesler cohesive model is employed to approximate nonlinear fracture processes in a local field. A topology‐based data structure is utilized to efficiently handle adjacency information during mesh modification events. The efficiency and validity of the proposed computational framework are demonstrated by checking the energy balances and comparing the results of the proposed computation with direct computations. Furthermore, the effects of microstructural properties, such as interfacial bonding strength and unit cell arrangement, on the dynamic fracture behavior are investigated. The computational results demonstrate that local crack patterns depend on the combination of microstructural properties such as unit cell arrangement and interfacial bonding strength; therefore, the microstructure of a material should be carefully considered for dynamic cohesive fracture investigations.

中文翻译：

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基于自适应微结构建模的复合材料多尺度动态断裂分析

在这项研究中，提出了一种计算框架来研究具有微观结构的材料中的多尺度动态断裂现象。复合材料的微观和宏观尺度通过引入自适应微观结构表示而得以整合。然后，使用运动方程式同时计算远场和局部场，该方程满足两个场之间的边界条件。在需要的位置和时间动态插入粘性表面单元，并使用Park-Paulino-Roesler粘性模型来近似局部场中的非线性断裂过程。基于拓扑的数据结构用于在网格修改事件期间有效处理邻接信息。通过检查能量平衡并将拟议的计算结果与直接计算进行比较，证明了所提出的计算框架的效率和有效性。此外，还研究了微观结构特性（例如界面结合强度和晶胞排列）对动态断裂行为的影响。计算结果表明，局部裂纹模式取决于单元结构和界面结合强度等微观结构特性的组合。因此，对于动态内聚断裂研究，应仔细考虑材料的微观结构。如界面结合强度和晶胞排列，对动态断裂行为进行了研究。计算结果表明，局部裂纹模式取决于单元结构和界面结合强度等微观结构特性的组合。因此，对于动态内聚断裂研究，应仔细考虑材料的微观结构。如界面结合强度和晶胞排列，对动态断裂行为进行了研究。计算结果表明，局部裂纹模式取决于单元结构和界面结合强度等微观结构特性的组合。因此，对于动态内聚断裂研究，应仔细考虑材料的微观结构。