文献类型：期刊文献

英文题名：Response Mechanism of Dynamic Tensile Mechanics in Granite Under Microwave Irradiation: Insights from Experiments and Simulations

作者：Sun, Bo-Wen[1];Yang, Sheng-Qi[2,3];Huang, Man[2];Li, Heng[1];Tian, Wen-Ling[3];Huang, Yan-Hua[3]

机构：[1]China Univ Min & Technol, State Key Lab Intelligent Construction & Hlth Oper, Xuzhou 221116, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China;[3]China Univ Min & Technol, Sch Mech & Civil Engn, Xuzhou 221116, Peoples R China

年份：2024

外文期刊名：ROCK MECHANICS AND ROCK ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001255236000004)、、EI(收录号：20242616508961)、Scopus(收录号：2-s2.0-85197119419)、WOS

基金：This research was funded by the National Key Research and Development Program (2022YFC2905700), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX23_2744), the Fundamental Research Funds for the Central Universities (2023XSCX051), and the Graduate Innovation Program of China University of Mining and Technology (2023WLKXJ182). The authors would further extend our heartfelt thanks to the editors and reviewers for providing invaluable comments that have significantly contributed to the improvement of this paper.

语种：英文

外文关键词：Microwave fracturing; Dynamic tensile; Thermal damage; Granite; FEM-DEM method

外文摘要：Microwave-assisted mechanical rock-breaking can effectively solve the problems of low efficiency of hard rock-breaking and severe wear and tear of equipment. This study used granite as the research object and analysed electromagnetic-thermal characteristics and dynamic tensile characteristics of microwave-irradiated granite. The microwave irradiation problem was decomposed into the electromagnetic-thermal unidirectional coupling and thermal-mechanical unidirectional coupling problems for numerical solutions, and the weakening mechanism of microwave irradiation was discussed at the microscopic level. The results showed that the thermal stress generated by the rapid heating and selective heating characteristics of microwave irradiation is the dominant factor in microwave fracturing. The presence of thermal cracks affects the crack extension path, making the failure more complicated. Tensile failure is the primary mechanical mechanism that causes the macroscopic fracture of the specimen, and intergranular failure dominates the overall failure of the specimen. Microwave irradiation reduces the shear resistance of the specimen. Microscopically, the proportion of shear cracks gradually increases with the increasing of irradiation duration (TM). Macroscopically, the area of the wedge-shaped failure zone gradually increases. The dynamic tensile experiment is used to evaluate the microwave weakening effect.Microwave irradiation effectively reduces the tensile strength and improves rock fragmentation.Proposed an FEM-DEM method for solving coupled electromagnetic-thermal-mechanical problems.The crack initiation, propagation, and coalescence process in the microwave-irradiated granite under dynamic Brazilian splitting experiments are reproduced.