研究几何构造和加载模式对岩石 I/II 混合模式断裂特性的影响：第一部分--数值模拟

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics Pub Date : 2024-10-20 DOI:10.1016/j.engfracmech.2024.110575

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引用次数: 0

摘要

几何构型和加载模式的影响是制约岩石断裂参数精确测定和断裂机理准确理解的瓶颈。因此，采用相场法分析了岩石 I/II 混合模式断裂过程中试样几何构型和加载模式对无量纲应力强度因子、峰值载荷、断裂韧性和裂纹起始角的影响。针对岩石 I/II 混合模式断裂测试，提出了三种新的试样配置。研究结果表明，随着预制裂纹倾角的增大，三点弯曲型试样的峰值载荷增大，而直径压缩型试样的峰值载荷减小。此外，几何构造对三点弯曲试样断裂参数的影响大于直径压缩盘试样。该研究成果可为建立 I/II 混合模式断裂测试标准提供基础支持数据。

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Investigating the influence of geometric configurations and loading modes on mixed mode I/II fracture characteristics of rocks: Part I-Numerical simulation

The influence of geometric configurations and loading modes is a bottleneck that restricts the accurate determination of rock fracture parameters and the precise understanding of fracture mechanisms. Therefore, the phase field method is employed to analyze the influences of specimen geometry and loading modes on the dimensionless stress intensity factors, peak load, fracture toughness, and crack initiation angle during the rock mixed mode I/II fracture process. Three new configurations of specimens are proposed to test rock mixed mode I/II fracture. The research results indicate that as the prefabricated crack inclination angle increases, the peak load of three-point bending type specimen increases, while the peak load of diametric-compression type specimen decreases. Moreover, the influence of geometric configurations on the fracture parameters of three-point bending specimens is greater than that of diametric-compression disk specimens. The research findings of this work can provide basic supporting data for the establishment of mixed mode I/II fracture testing standards.

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来源期刊

Engineering Fracture Mechanics 物理-力学

CiteScore

8.70

自引率

13.00%

发文量

606

审稿时长

74 days

期刊介绍： EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.