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在压力负荷下,双边破裂平的巴西圆盘样本的断裂机械性能
Wen Hua1,2, Wenyu Zhang2, Shiming Dong2
1College of Mechanical and Electrical Engineering, Xichang University, Xichang 615000, China.
Materials (Basel, Switzerland)
|February 26, 2025
概括
这项研究引入了一种新型的双边破裂平巴西圆盘 (DCFBD) 样本,用于分析岩石剪切断裂力学. 该DCFBD样本能够准确评估应力强度因子和T-应力,从而推进岩石断裂测试技术.
科学领域:
- 地质技术工程 地质技术工程
- 岩石机械学 岩石机械学
- 断裂力学 断裂力学 断裂力学
背景情况:
- 深层破裂岩石通常通过压缩-剪切负荷下切割裂变而失败,这是由于现场应力造成的.
- 了解岩石剪切断裂力学对于地质技术应用至关重要.
研究的目的:
- 为了开发和验证一种新型标本,双边破裂平巴西圆盘 (DCFBD),用于研究岩石的剪切断裂机械性质.
- 为了研究几何参数对压缩剪切负荷下的断裂行为的影响.
主要方法:
- 在DCFBD样本上进行了有限元分析,以计算压力强度因子 (SIF) 和T-压力.
- 进行了参数研究,以评估负载分布角度 (γ),无维裂纹长度 (α) 和裂纹倾斜角度 (θ) 的影响.
- 进行了实验性骨折测试,以验证DCFBD样本实现剪切骨折的能力.
主要成果:
- 为DCFBD样本生成了SIF和T压力的综合数据集.
- 负载分布角度对无维SIF的影响对于α ≥0.60和γ ≤20°是可以忽略不计的,但T应力需要考虑更大的裂纹倾斜角度.
- 实验验证证证实DCFBD样本在适当条件下可以实现真实模式II (剪切) 断裂.
结论:
- DCFBD样本是研究岩石剪切断裂力学的一个有效工具.
- 这些发现为了解和预测岩石中剪切断裂行为提供了关键数据.
- 这项研究有助于岩石剪切断裂测试方法的进步.
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