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.
出处
《中国电机工程学报》
EI
CSCD
北大核心
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)。
