A method for detecting two-dimensional plane stress distribution in basin-type insulator based on critically refracted longitudinal wave  

作　　者：Zhaoyang Kang Fuqiang Ren Hongru Zhang Jingjing Yang Kaining Hou Qingquan Li Dongxin He Hongshun Liu Yongzhi Zhao Huaxin Wen 

机构地区：[1]Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment,School of Electrical Engineering,Shandong University,Jinan,China [2]Shandong Electrical Engineering&Equipment Group Co.Ltd,Jinan,China [3]SDEE Hitachi High-voltage Switchgear Co.,Ltd,Jinan,China

出　　处：《High Voltage》2024年第1期105-116,共12页高电压（英文）

基　　金：Major Scientific and Technological Innovation Project of Shandong Province,Grant/Award Number:2021CXGC010211。

摘　　要：Basin-type insulator often has small cracks due to stress concentration.The current method cannot accurately reflect the stress condition of the insulator to find the stress concentration areas.To solve these problems,a method for detecting two-dimensional plane stress(δ_(1) andδ_(2))within different depth ranges in a basin-type insulator is proposed based on critically refracted longitudinal(LCR)wave.First,the acoustoelastic equation characterising the relationship between the variation of LCR wave propagation time and the plane stress was derived.Next,the propagation characteristics of LCR wave in epoxy resin samples were investigated.Then,the stress distribution within different depth ranges of the insulator subjected to hydraulic load was measured using the proposed method,including direction(θ),δ_(1) andδ_(2).The results show that the magnitude of the stress alone cannot accurately characterise the stress state.Points with equal distances to the centre have similar stress magnitudes,but their directions are not the same.With increasing depth,θremains essentially unchanged at the same location,whileδ1 andδ2 decrease,and the rate of decrease varies at different locations.Comparing the measured and simulated data,the results showed that they were in good agreement,and the maximum errors of stress value andθwere 0.69 MPa and 2.97°,respectively,which confirmed the feasibility and accuracy of the stress detection in the proposed method.

关 键 词：STRESS INSULATOR WAVE 

分 类 号：TM216[一般工业技术—材料科学与工程]