Influence of crack surface friction on crack initiation and propagation: A numerical investigation based on extended finite element method |
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| Institution: | 1. Department of Engineering Mechanics, Hohai University, Nanjing 211100, PR China;2. Institute for Research and Development, Duy Tan University, Da Nang City, Viet Nam;3. Department of Civil and Environmental Engineering, Tokyo Institute of Technology, 2-12-1-W8-22, Ookayama, Meguro-ku, Tokyo 152-8552, Japan;1. School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450046, China;2. Geotechnical & Structural Engineering Research Center, Shandong University, Jinan 250061, China;3. State Key Laboratory of Shield Machine and Boring Technology, Zhengzhou 450001, China;1. MIRARCO, Laurentian University, Sudbury, Canada;2. Bharti School of Engineering, Laurentian University, Sudbury, Canada;3. Key Laboratory of Ministry of Education for Safe Mining of Deep Metal Mines, Northeastern University, Shenyang, China;1. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science and Technology Beijing 100083, China;2. School of Civil, Environmental and Mining Engineering, University of Adelaide, SA 5005, Australia;3. School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, China;1. School of Resources and Safety Engineering, Central South University, Changsha, Hunan 410083, China;2. School of Civil, Environmental and Mining Engineering, The University of Western Australia, Perth 6009, Australia |
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| Abstract: | Rock strengths are directly influenced by the open or closed flaws widely distributed in rock masses. Extensive studies have been conducted on the propagations of open flaws in rocks. However, few concerns are paid on the propagation of closed flaws, the influence of the surface friction on the initiation and propagation of closed flaws should be investigated systematically. In present article, the crack initiation and propagation in rock like material subjected to compressive loads have been investigated. The effects of crack surface friction on crack initiation and propagation have been quantified with the help from extended finite element method which is efficient and accurate. Based on the analysis on stress distribution and propagation patterns, following results are obtained: Firstly, minor effects are exerted by crack surface friction on the stress distribution around the flaws when the flaws inclination angle is 30° and 45°. However, as the inclination angle increases to 60°, the effects are much more significant. Secondly, as the inclination angle ranges from 30° to 60°, the most favorable angle for crack propagation is 45°. Thirdly, the initiation location and angle of the wing cracks will not be influenced by the frictions. However, the propagation length will be greatly influenced by the friction and the inclination angle. |
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| Keywords: | Frictional flaws Wing cracks Crack initiation Extended finite element method (XFEM) |
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