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首页> 外文期刊>Engineering Fracture Mechanics >Understanding the fracture behavior of brittle and ductile multi-flawed rocks by uniaxial loading by digital image correlation
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Understanding the fracture behavior of brittle and ductile multi-flawed rocks by uniaxial loading by digital image correlation

机译：通过数字图像相关性通过单轴载荷理解脆性和韧性多缺陷岩石的断裂行为

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摘要

Fracturing behavior of ductile multi-flawed rock mass is very different from those of brittle multi-flawed rock mass. However, there is a very vague distinction of the fracture mechanism of ductile multi-flawed rock mass from that of brittle multi-flawed rock mass due to the absence of quality experimental data. To evaluate the fracturing behavior and further reveal the failure mechanism of brittle and ductile multi-flawed rock masses, a comparison study on brittle and ductile laboratory rock-like specimens that contain nine pre-existing flaws subjected to uniaxial compression is conducted. The advanced optical technique, Digital Image Correlation (DIC), is adopted to capture the real-time displacement and strain fields on the surface of the rock-like specimens. The fractal dimension estimation method is introduced to quantitatively track the fracture process. The fracture process, the crack coalescence mode and the fracturing mechanism are obtained as well as the stress-strain response. For ductile multi-flawed rock-like specimens, four crack initiation modes and nine types of crack coalescence are observed. For brittle multi-flawed rock like specimens, four crack initiation modes and eight types of crack coalescence are observed. Comparison of fracturing behavior indicates that crack initiation mode transforms from shear crack to tensile crack as the brittleness index increases; the coalescence mode transforms from shear crack coalescence to the coalescence of tensile crack and shear crack; then to the tensile crack coalescence as the brittleness index increases. Observations on the ultimate failure modes indicate that the failure mode transforms from shear failure to the mixed tension-shear failure, then to splitting failure as the brittleness index increases. Most macrocracks in brittle multi-flawed rock-like specimens develop from crack coalescence occurring in a “columnar” pattern, while most macrocracks in ductile multi-flawed rock-like specimens develop from shear cracks. Moreover, the effects of the brittleness index on the complete stress-strain curve, the crack initiation stress and the peak strength are also investigated in detail.
机译：延性多缺点岩体的压裂行为与脆性多缺点岩体的岩石质量截然不同。然而，由于没有质量实验数据，韧性多缺陷岩体的骨折机制具有非常模糊的区别。为了评估压裂行为并进一步揭示脆性和延性多缺点岩体的失效机理，对含有九个预先存在于单轴压缩的脆性和韧性实验室岩样标本的比较研究。采用先进的光学技术，数字图像相关（DIC）来捕获岩石样本表面上的实时位移和应变场。引入分形尺寸估计方法以定量跟踪断裂过程。获得裂缝过程，裂缝结合模式和压裂机构以及应力 - 应变反应。对于延性多缺点的岩样标本，观察到四种裂纹引发模式和九种裂缝聚结。对于脆性多缺点岩石，如样本，观察到四种裂纹引发模式和八种类型的裂缝结。压裂行为的比较表明，随着脆性指数的增加，裂纹启动模式从剪切裂纹转变为拉伸裂纹;聚结模式从剪切裂缝聚结变换到拉伸裂纹和剪切裂纹的聚结;然后随着脆性指数的增加，拉伸裂缝聚结。关于最终故障模式的观察表明，失效模式从剪切失效转换为混合张力剪切故障，然后在脆性指数增加时分离失败。大多数MacRecrack在脆性多缺陷的岩石样标本中从“柱状”图案发生的裂缝聚结，而韧性多缺陷岩样标本中的大多数MacRecracks从剪切裂缝产生。此外，还详细研究了脆性指数对完全应力 - 应变曲线，裂纹引发应力和峰强度的影响。

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