基于使用DIC的远场移位的裂纹传播模式和断裂过程区域演变的实验研究
Yang Qiao1, Xian-Bo Guan2, Zong-Xian Zhang2
1Oulu Mining School, University of Oulu, Oulu, Finland. yang.qiao@oulu.fi.
Scientific reports
|November 9, 2023
概括
数字图像相关性揭示了岩石断裂区域和裂传播动态. 断裂过程区域 (FPZ) 的长度波动,而裂纹速度在岩石破裂过程中发生显著变化.
科学领域:
- 地质技术工程 地质技术工程
- 材料科学 材料科学 材料科学
- 岩石力学 岩石力学 岩石力学
背景情况:
- 了解岩石裂变机制对于地质工程和资源开采至关重要.
- 描述断裂过程区域 (FPZ) 和裂传播是预测岩石破裂的关键.
- 需要先进的成像技术来可视化和量化复杂的骨折现象.
研究的目的:
- 在岩石装载和卸载过程中调查断裂过程区域 (FPZ) 的长度和迁移速度.
- 使用数字图像相关性 (DIC) 和扫描电子显微镜 (SEM) 分析裂传播模式和速度.
- 识别FPZ内的微尺度特征及其与裂行为的关系.
主要方法:
- 使用数字图像相关性 (DIC) 来测量岩石样本中的远场移位和变异.
- 分析应变和位移分布,以定义不同的断裂区域 (完好无损,裂传播,FPZ).
- 使用扫描电子显微镜 (SEM) 来观察断裂表面的微观结构特征.
主要成果:
- 骨折的带根据位移变化被分为完整的,裂传播的和FPZ.
- FPZ长度在最大负载时达到峰值,随后下降;FPZ迁移速度从-48到1460 m/s不等.
- 裂传播速度在24-700 m/s之间变化,最初的传播区域显示出更严重的损伤.
结论:
- 岩石断裂涉及不同的区域,具有不同的机械行为和微观结构特征.
- FPZ的动态性质和裂传播影响了整个岩石质量的完整性.
- DIC和SEM提供了对岩石破裂的复杂过程的互补洞察力.
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