JRMGE / Vol 14 / Issue 3

Article

Fracture of two three-dimensional parallel internal cracks in brittle solid under ultrasonic fracturing

Haijun Wang, Hanzhang Li, Lei Tang, Xuhua Ren, Qingxiang Meng, Chun Zhu

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a State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, 210029, China
b School of Earth Sciences and Engineering, Hohai University, Nanjing, 210098, China


2022, 14(3): 757-769. doi:10.1016/j.jrmge.2021.11.002


Received: 2021-07-15 / Revised: 2021-09-19 / Accepted: 2021-11-21 / Available online: 2021-12-06

2022, 14(3): 757-769.

doi:10.1016/j.jrmge.2021.11.002


Received: 2021-07-15

Revised: 2021-09-19

Accepted: 2021-11-21

Available online: 2021-12-06


Abstract:

Similar to hydraulic fracturing (HF), the coalescence and fracture of cracks are induced within a rock under the action of an ultrasonic field, known as ultrasonic fracturing (UF). Investigating UF is important in both hard rock drilling and oil and gas recovery. A three-dimensional internal laser-engraved crack (3D-ILC) method was introduced to prefabricate two parallel internal cracks within the samples without any damage to the surface. The samples were subjected to UF. The mechanism of UF was elucidated by analyzing the characteristics of fracture surfaces. The crack propagation path under different ultrasonic parameters was obtained by numerical simulation based on the Paris fatigue model and compared to the experimental results of UF. The results show that the 3D-ILC method is a powerful tool for UF research. Under the action of an ultrasonic field, the fracture surface shows the characteristics of beach marks and contains powder locally, indicating that the UF mechanism includes high-cycle fatigue fracture, shear and friction, and temperature load. The two internal cracks become close under UF. The numerical result obtained by the Paris fatigue model also shows the attraction of the two cracks, consistent with the test results. The 3D-ILC method provides a new tool for the experimental study of UF. Compared to the conventional numerical methods based on the analysis of stress–strain and plastic zone, numerical simulation can be a good alternative method to obtain the crack path under UF.

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Keywords: Three-dimensional internal laser-engraved crack (3D-ILC), Interaction of cracks, Ultrasonic fatigue, Penny-shaped crack, Fracture mechanics, High-cycle fatigue

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Haijun Wang, Hanzhang Li, Lei Tang, Xuhua Ren, Qingxiang Meng, Chun Zhu, 2022. Fracture of two three-dimensional parallel internal cracks in brittle solid under ultrasonic fracturing. J. Rock Mech. Geotech. Eng. 14 (3), 757-769.

Author(s) Information

Lei Tang

Prof. Lei Tang received his PhD degree at China University of Mining and Technology in 1998 and took the position of engineer at Nanjing Hydraulic Research Institute (NHRI) at the same year. He was promoted to senior engineer in 2002, and professor level senior engineer in 2007. In 2008, he worked at Delft University of Technology as a Visiting Scholar. He has worked as a Vice Director of Materials and Structural Engineering Department in NHRI since 2007 and became Director at 2020. He is an editorial board member of Journal of Hydro-Science and Engineering and the registered consulting expert of Jiangsu Province, China. He was elected in “333 High-level Talents Training Project” of Jiangsu Province. His research currently focuses on hydraulic structural health diagnosis, mainly including detecting technology and equipment for concrete microcracks, telemetry and equipment for concrete microcracks, detecting and visualizing reinforcement technology and equipment for deep-buried diseases in high dams, and objective index of surrounding rock instability. He had undertaken 5 projects from National Natural Science Foundation of China including the major instrument and equipment project, the major project and the general projects. He has published more than 60 academic papers and 3 books, and obtained 15 national invention patents in recent ten years.