Johnson-Cook Model-based Study on Crack Initiation and Propagation Behavior of Epoxy Resin in GIS Spacers
DUAN Yimeng1, YANG Hao1,2,*, WANG Xin1, HUANG Jun1, ZHAO Sirui1, ZHOU Fusheng2,3, GAO Chao3
1 School of Electronics and Information, Xi’an Polytechnic University, Xi’an 710048, China 2 School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China 3 National Engineering Research Center of UHV Technology and Novel Electrical Equipment Basis, Kunming 651705, China
Abstract: Micro cracks may occur on the surface of the epoxy resins of the GIS spacers during the design and installation process. As the cracks gra-dually expand during the insulators’ service in various extreme working conditions, which poses a great threat to the long-term safe and stable operation of GIS. Based on the Johnson-Cook theory of elastic-plastic fracture mechanics, this work employed ABAQUS finite element to set the mechanical parameters of epoxy resin, and combined the joint simulation method of FRANC3D and ABAQUS to conduct extended analysis of epoxy resin specimens containing cracks. The crack propagation path and crack propagation life of flat plates containing edge penetration cracks in different directions under different fatigue loads, different stress ratios, and different crack shapes were predicted. The results showed that compared with stress ratio 0.1 and stress ratio 0.3, the crack propagation life was reduced by less than half, and the stress ratio directly affected the stress intensity factor at the crack tip. In addition, the initial crack angle at the edge did not change the crack expansion direction. When shear stress was applied at the same time, the crack expansion direction changed significantly, and the fatigue life changed from 3.31×107 s to 1.72×105 s, thereby led to a time consumption for the propagation of a circular crack 900% larger than that for the propagation of a square crack. It could then be concluded that, increasing the stress ratio and edge crack angle effectively results in rise of service life of GIS spacers;epoxy containing square cracks is inferior in fatigue life to that containing circular cracks;shear stress is more destructive than tensile stress to insulator materials. The output of this work may provide data support and theoretical basis for subsequent studies about fatigue life of GIS spacers.
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2025, Vol. 39 
