A generic computational model for three-dimensional fracture and fragmentation problems of quasi-brittle materials
A generic computational model for three-dimensional fracture and fragmentation problems of quasi-brittle materials
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DOI：
10.1016/j.euromechsol.2020.104069
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
Liwei Guo;J. Xiang;J. Latham;B. Izzuddin
中科院分区：
文献类型：
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作者：
Liwei Guo;J. Xiang;J. Latham;B. Izzuddin
三维断裂和破碎对于理解准脆性材料在破坏应力状态下的力学行为具有重要意义。在本文中，一个通用的计算模型已经开发了一个内部的C/C++代码使用相结合的有限元-离散元法，它能够模拟整个三维断裂过程，包括峰前硬化变形，峰后应变软化，从连续到不连续的过渡，离散片段之间的显式相互作用。通过巴西试验和多轴压缩试验对计算模型进行了验证，并给出了一个真实的多层岩石原位应力模型作为应用实例。结果表明，该计算模型可以同时捕捉连续和非连续的行为，因此，它提供了一个理想的数值工具的断裂和破碎问题。
Fracture and fragmentation in three dimensions are of great importance to understand the mechanical behaviour of quasi-brittle materials in failure stress states. In this paper, a generic computational model has been developed in an in-house C/C++ code using the combined finite-discrete element method, which is capable of modelling the entire three-dimensional fracturing process, including pre-peak hardening deformation, post-peak strain softening, transition from continuum to discontinuum, and explicit interaction between discrete fragments. The computational model is validated by Brazilian tests and polyaxial compression tests, and a realistic multi-layer rock model in anin situstress condition is presented as an application example. The results show that the computational model can capture both continuum and discontinuum behaviour and therefore it provides an ideal numerical tool for fracture and fragmentation problems.