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| Application of combined finite-discrete element method for crack propagation |
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SUN Xiang, LIU Chuan-qi, XUE Shi-feng
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(College of Pipeline and Civil Engineering in China University of Petroleum, Qingdao 266580, China)
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| Abstract: |
| The process of crack growth was simulated based on the combined finite-discrete element method. The media existing primary cracks was divided by elements. The unit and unit interface were calculated using the finite element and discrete element method, respectively. The continuum was converted into discontinuum by transformation of connection types between elements. The contacts were detected using the half-spring method in plane. The motion equation was solved in an explicit iterative scheme. Updating the coordinates of elements, the process of crack propagation was simulated. The simulation results of a single crack and en echelon cracks under uniaxial compression were contrasted with experimental results. The results show that the process of crack propagation can be effectively simulated using the combined finite-discrete element method. The en echelon cracks with 90°rock bridge under uniaxial compression were linked by wing cracks. |
| Key words: finite element method discrete element method crack propagation numerical simulation |
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