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Comparison of Numerical and Physical Models for Understanding Shear Fracture Processes

机译：理解剪切断裂过程的数值模型和物理模型的比较

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An understanding of the formation of shear fractures is important in many rock engineering design problems. Laboratory experiments have been performed to determine the Mode II fracture toughness of Mizunami granite rock samples using a cylindrical `punch-through' testing device. In this paper we attempt to understand and interpret the experimental results by numerical simulation of the fundamental shear fracture initiation and coalescence processes, using a random array of displacement discontinuity crack elements. It is found that qualitative agreement between the experimental and numerical results can be established, provided that shear-like micro-scale failure processes can be accommodated by the failure initiation rules that are used in the numerical simulations. In particular, it is found that the use of an exclusively tension-driven failure initiation rule does not allow the formation of macro-shear structures. It is apparent, also, that further investigation is required to determine how consistent rules can be established to link micro-failure criteria to equivalent macro-strength and toughness properties for a macro-shear slip surface.
机译：在许多岩石工程设计问题中，了解剪切裂缝的形成很重要。已经使用圆柱形的“穿通”测试装置进行了实验室实验以确定水波花岗岩岩石样品的II型断裂韧性。在本文中，我们尝试使用位移不连续裂纹单元的随机阵列，通过基本剪切断裂的萌生和合并过程的数值模拟来理解和解释实验结果。发现可以建立实验结果与数值结果之间的定性一致，前提是数值模拟中使用的破坏起始规则可以适应剪切样的微型破坏过程。特别地，发现使用专门的张力驱动的失效起始规则不允许形成宏观剪切结构。同样显而易见的是，还需要进一步的研究以确定如何建立一致的规则，以将微观破坏准则与宏观剪切滑动表面的等效宏观强度和韧性属性联系起来。

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