Electrical tree modelling in dielectric polymers using a phase-field regularized cohesive zone model

• DOI: 10.1016/j.matdes.2023.112409
• Publication Date: 2023-10-18T07:47:55Z
• Authors: Qi Wang; Yuheng Deng; Malvern Yap; Yan Yang; Jielin Ma; Wen Kwang Chern; Jin Li; Zhong Chen
• Keywords: Electrical treeing; Dielectric strength

Electrical treeing is a leading cause of the eventual breakdown dielectric polymers under high voltages. This paper presents simulation scheme developed based on phase-field regularized cohesive zone model (PF-CZM) for electrical tree modelling. By using analog crack propagation, localized modelled by evolution surface energy, and driven competition between energy stored following laws thermodynamics. The microscopic Weibull distribution strength key factor resulting in fractal structures tree. mesh independent length-scale insensitive when size no greater than 2.5μm. validity was confirmed through experiments, which strengthens its credibility. Three types composites are designed compared. results indicate that epoxy resin enhanced with 5 vol% silica 1 graphene sheet have 3.5% longer time 29.2% higher thermal conductivity pure resin. Overall, provides valuable tool understanding physics designing new materials withstand