论文标题

通过四阶相位内凝结区模型在准脆性材料中的裂纹繁殖

Crack propagation in quasi-brittle materials by fourth-order phase-field cohesive zone model

论文作者

Nguyen, Khuong D., Thanh, Cuong-Le, Vogel, Frank, Nguyen-Xuan, H., Abdel-Wahab, M.

论文摘要

相位场的方法成为建模裂纹传播的最受欢迎的候选人。它使用标量辅助变量,即相位场变量,对连续性域中的不连续区域进行建模。此外,与二阶相比,四阶相位方法产生的收敛速率和更准确的解决方案。但是,它可用于建模脆性材料中的裂纹繁殖。这项研究介绍了将非标准相视野形式与凝聚区模型(CZM)相结合的四阶相位模型,以预测准脆性材料中的裂纹传播。 Cornelisson的软化定律用于捕获裂纹繁殖预测的高精度。混凝土材料被认为是一种准脆性材料。为了使用基于NURB的有限元素的计算效率,使用虚拟不常见的插入的主奴隶(Vukims)技术来推导局部改进网格。文献已发表的结果证实了数值结果。发现使用第四阶相视野CZM,峰载荷和裂纹路径与元素大小无关,对长度尺度数字不敏感。我们提出的模型在计算成本和解决方案的准确性方面与标准相位方法相比显示了最重要的优势。

A phase-field approach becomes a more popular candidate in modeling crack propagation. It uses a scalar auxiliary variable, namely a phase-field variable, to model a discontinuity zone in a continuity domain. Furthermore, the fourth-order phase-field approach produces a better convergence rate and more accurate solutions than the second-order one. However, it is available for modeling crack propagation in brittle material. This study addresses the fourth-order phase-field model combining the non-standard phase-field form with a cohesive zone model (CZM) to predict crack propagation in quasi-brittle material. A Cornelisson's softening law is used to capture the high precision of crack propagation prediction. The concrete material is considered as a quasi-brittle one. For computation efficiency using NURBS-based finite elements, Virtual Uncommon-Knot-Inserted Master-Slave (VUKIMS) technique is employed to derive a local refinement mesh. Numerical results are verified by the published ones from literature. It was found that the peak load and crack path are independent of the element size and insensitive to the length-scale number using the fourth-order phase-field CZM. Our proposed model shows the most significant advantage compared to the standard phase-field approach in terms of computational cost and solution accuracy.

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