Electrical treeing: A phase-field model

Cai, Ziming1,4; Wang, Xiaohui1; Li, Longtu1; Hong, Wei2,3,4

2019-04

10.1016/j.eml.2019.02.006

Extreme Mechanics Letters   影响因子和分区

2352-4316

Electrical treeing is a commonly observed phenomenon associated with dielectric breakdown in solid dielectrics. In this work, a phase-field model is developed to study the initiation and propagation of electrical trees in two different geometries: a parallel capacitor and a cylindrical capacitor. The model utilizes a continuous field of damage variable to distinguish the localized damaged regions from the undamaged bulk material. Factors that affect electrical tree morphology, including discharge speed and damage mobility, are studied. Electrical treeing tends to exhibit a fractal shape with more branches at a relatively high discharge speed relative to the rate of damage. Furthermore, the effect of fillers on electrical treeing is also studied. Numerical results suggest that fillers of lower permittivity, higher breakdown energy or lower damage mobility will promote fractal treeing and thus resist catastrophic breakdown. (C) 2019 Elsevier Ltd. All rights reserved.

Electrical treeing Dielectric breakdown Discharge speed Filler effect

SCI ; EI

英语

通讯

National Natural Science Foundation of China[51672148]

Engineering ; Materials Science ; Mechanics

Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics

WOS:000464224900012

ELSEVIER SCIENCE BV

20191206664836

Dielectric materials ; Electric breakdown ; Fillers ; Fractals

Electricity: Basic Concepts and Phenomena:701.1 ; Dielectric Materials:708.1 ; Mathematics:921

Web of Science

1.Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
2.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdong, Peoples R China
3.Hokkaido Univ, Global Stn Soft Matter, Global Inst Collaborat Res & Educ, Sapporo, Hokkaido, Japan
4.Iowa State Univ, Dept Aerosp Engn, Ames, IA 50010 USA

Cai, Ziming,Wang, Xiaohui,Li, Longtu,et al. Electrical treeing: A phase-field model[J]. Extreme Mechanics Letters,2019,28:87-95.

Cai, Ziming,Wang, Xiaohui,Li, Longtu,&Hong, Wei.(2019).Electrical treeing: A phase-field model.Extreme Mechanics Letters,28,87-95.

Cai, Ziming,et al."Electrical treeing: A phase-field model".Extreme Mechanics Letters 28(2019):87-95.