The rate dependence of the dielectric strength of dielectric elastomers  

作　　者：Xianghe Zheng Jianyou Zhou Pan Jia Zheng Zhong 

机构地区：[1]School of Science,Harbin Institute of Technology,Shenzhen,China

出　　处：《International Journal of Smart and Nano Materials》2024年第1期110-126,共17页国际智能和纳米材料杂志（英文）

基　　金：supported by the National Natural Science Foundation of China(Project No.12102108);Guangdong Basic and Applied Basic Research Foundation(Project No.2020A1515111027);Shenzhen Science and Technology Program(Project No.JCYJ20210324120212034);Talent Recruitment Project of Guangdong(Project No.2021QN02G677).

摘　　要：Elastomers are widely used in electronics and electrical devices,either as insulators or transducers.The insulation and actuation performance of elastomers are highly suscepti-ble to their dielectric strength.Among the factors that influ-encethedielectricstrength ofelastomers,material viscoelasticity is an important factor that needs further inves-tigation.Since the material viscoelasticity is often character-ized by rate-dependent behaviors,we present two different sample configurations to experimentally examine the electrical and mechanical rate dependence of the dielectric strength of VHB 4905 elastomers.At pre-stretch ratio of 4,the improve-ment of the dielectric strength is about 30%from voltage ramp of 50 V/s to 800 V/s.Particularly,with an in-house biaxial test platform,the effect of the stretching rate on the dielectric strength is examined for the first time.The improvement of the dielectric strength is about 35%from stretching rate of 0.1 mm/s to 5 mm/s.Moreover,a dielectric strength predictor based on configurational stress is adopted to describe the experimental data.According to the predictor,the loading rate affects the dielectric strength of the elastomer mainly by influencing the evolution of the inelastic deformation.

关 键 词：Dielectric strength dielectric elastomers material viscoelasticity rate-dependence configurational stress 

分 类 号：TB30[一般工业技术—材料科学与工程]