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Use of bulk embedding cohesive elements to realize bifurcating propagation of rock crack
Geomechanics and Geophysics for Geo-Energy and Geo-Resources ( IF 5 ) Pub Date : 2021-01-02 , DOI: 10.1007/s40948-020-00206-5
Pengyu Wang , Shuhong Wang , Alipujiang Jierula , Zihan Sun

To investigate the connection and bifurcation problems of the propagation principle and behavior in the whole process of rock crack, bulk insert of cohesive elements between entity elements has been developed. First, it defines what kind of cohesive element is best to be inserted between the model elements. To minimize the influence of embedded cohesive elements on the overall stiffness, Kcohesive needs to be far greater than that of the solid elements. Moreover, it is found that if the maximum principal stress criterion is used as the criterion of crack damage initiation and the displacement law is used as crack evolution criterion, the simulation results had the best convergence. Second, it finds a way to insert cohesive elements between all the elements of the model. It is realized by revising the inp file. For a complicated model with many elements, manual revising is difficult. The pattern of inserting cohesive elements in the inp file has been programed such that the inp file can be revised automatically. In Example 1, the three-point bending failure mode of concrete beams has been simulated. The simulated results have been compared with the experimental results so as to verify the effectiveness of the cohesive element in simulating the crack propagation and the correctness of the program for bulk insertion of the cohesive elements. In Example 2, cracking, propagation, connection and bifurcation of cracks in rocks containing inclusions have been simulated, and the tests are being carried out.



中文翻译:

使用块状内嵌粘结元件实现岩石裂缝的分叉传播

为了研究岩石裂隙全过程中传播原理和行为的联系和分叉问题,开发了实体单元之间的粘性单元的整体插入。首先,它定义了最好在模型元素之间插入哪种内聚元素。为了使嵌入的内聚性元素对整体刚度的影响最小化,K内聚性需要远远大于实体元素。此外,发现如果将最大主应力准则用作裂纹损伤的发起准则,而将位移定律用作裂纹演化的准则,则模拟结果具有最佳的收敛性。其次,它找到一种在模型的所有元素之间插入内聚元素的方法。它是通过修改inp文件来实现的。对于具有许多要素的复杂模型,很难进行手动修改。已对在inp文件中插入内聚元素的模式进行了编程,以便可以自动修改inp文件。在示例1中,已经模拟了混凝土梁的三点弯曲破坏模式。将模拟结果与实验结果进行了比较,从而验证了粘性元件在模拟裂纹扩展方面的有效性以及程序的正确性。在实施例2中,模拟了包含夹杂物的岩石中的裂纹的开裂,扩展,连接和分叉,并且正在进行测试。

更新日期:2021-01-02
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