Interfacial debonding, a critical failure mechanism in heterogeneous materials, is often characterized by mixed-mode fracture. This study develops a numerical framework to simulate bulk and interfacial fractures in composite materials. A phase-field cohesive zone model, incorporating a directional energy decomposition scheme and a modified toughness method, is employed to capture complex fracture behaviors. A level-set method explicitly defines interface positions, while an adaptive mesh refinement strategy enhances computational efficiency. Numerical examples validate the model’s accuracy and efficiency in predicting mixed-mode crack propagation and interfacial debonding. This work provides a robust and efficient approach to simulate complex fracture phenomena in heterogeneous materials, especially for the mixed-mode fracture.

中文翻译：

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自适应相场内聚力区模型，用于模拟具有定向能量分解的非均质材料中的混合模式界面和体裂缝

界面脱键合是非均相材料中的一种关键失效机制，通常以混合模式断裂为特征。本研究开发了一个数值框架来模拟复合材料中的体和界面断裂。采用相场内聚区模型，结合定向能量分解方案和改进的韧性方法，来捕获复杂的断裂行为。水平集方法明确定义了界面位置，而自适应网格细化策略提高了计算效率。数值示例验证了该模型在预测混合模式裂纹扩展和界面脱粘方面的准确性和效率。这项工作提供了一种稳健而有效的方法来模拟非均相材料中的复杂断裂现象，尤其是混合模式断裂。