超声法检测绝缘子用玻璃钢芯棒脆断裂纹的研究  

ULTRASONIC DETECION ON CRACK OF FRP ROD IN BRITTLE FRACTURE OF COMPOSITE INSULATOR

作　　者：梁曦东[1] 戴建军[1] 周远翔[1] 陈以方[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京市海淀区100084

出　　处：《中国电机工程学报》2005年第3期110-114,共5页Proceedings of the CSEE

基　　金：国家杰出青年基金(50025720);高等学校博士学科点专项科研基金(2000000315)。

摘　　要：脆断是高电压复合绝缘子在很低的日常载荷下发生的恶性断裂事故,国内外研究认为应力腐蚀造成了绝缘子芯棒脆断的发生。文中根据芯棒脆断的特点,提出以超声纵波斜入射检测芯棒脆断横截面上的裂纹,同时据此研制了一种用于芯棒脆断裂纹检测的超声探头,并对芯棒脆断时裂纹的扩展过程进行了检测,得到了芯棒脆断裂纹发展过程中超声脉冲回波幅值的变化并对其进行了讨论分析,这对于进一步了解复合绝缘子的脆断机理有重要意义。Brittle fracture is a severe mechanical failure accident of high voltage composite insulator, it occurs when insulator suffers a very low mechanical load. Up to now, researches have shown that it is a stress corrosion cracking leading to the brittle fracture of Fiber Reinforced Plastics (FRP) rod. According to the characteristic of brittle fracture in FRP rod, a method for detecting the crack in the cross-section of FRP rod using the oblique incident longitudinal waves of ultrasonic was presented, and a special ultrasonic transducer probe was made to detect the crack propagation in the process of brittle fracture of FRP rod. Test results show the variation of the amplitude of pulse-echo ultrasonic due to crack propagation in FRP rod subjected to tensile load and acid, and has a significant value for understanding the mechanism of brittle fracture of composite insulators.

关 键 词：脆断 芯棒 裂纹检测 钢芯 断裂事故 应力腐蚀 幅值 复合绝缘子 高电压 玻璃钢 

分 类 号：TM216[一般工业技术—材料科学与工程] TG356[电气工程—电工理论与新技术]