摘要
为了研究铜网防护层对复合材料的雷击防护效果,采用两种不同雷电流波形,对不同尺寸含铜网(0.25 mm厚)与无铜网防护复合材料试件进行模拟雷电流冲击实验,通过目视损伤观察、光学显微镜放大、超声损伤扫描,对比分析复合材料的雷击损伤程度及特征。结果表明:雷电流波形1,峰值电流分别为50 k A和80 k A时,Type1(150 mm×100 mm)型试件无铜网防护下复合材料的雷击损伤面积和深度分别为1785 mm^2,0.63 mm和3041 mm^2,0.96 mm,而含铜网防护试件基本无损伤;雷电流波形2,峰值电流为40 k A时,Type 2(250 mm×45 mm)型试件无铜网防护下的雷击损伤面积和深度分别为2156.75 mm^2,0.36 mm,而含铜网防护试件损伤面积小于100 mm^2,里层还未损伤;0.25 mm铜网能够承受的最大雷电流强度存在一个门槛值,该门槛值可用作用积分来表示,雷击防护效果与试件尺寸无关,仅与作用积分有关,其对应作用积分门槛值约为85218 A^2·s。
In order to study the lightning protection effect of copper wire mesh on composite materials,two different lightning current waveforms were used to simulate the lightning current impact test on composite specimens with and without copper wire mesh in different sizes.Through visual damage observation,optical microscope amplification and ultrasonic damage scanning,the lightning damage degree and characteristics of composite materials were compared and analyzed.The experimental results show that when the lightning current waveform is 1 and peak currents are 50 kA and 80 kA,the lightning strike damage area and depth of the Type1 specimen without copper wire mesh are 1785 mm2,0.63 mm and 3041 mm2,0.96 mm respectively,while the test specimens with copper wire mesh in the same type are basically scatheless.When the lightning current waveform is 2 and the peak current is 40 KA,the lightning strike damage area and depth of the Type2 specimen without copper wire mesh are 2156.75 mm2,0.36 mm,while the damage area of the test specimen with copper wire mesh in the same type is less than 100 mm2,and the inner layer has not been damaged.There exists a threshold value for the maximum lightning current strength of the 0.25 mm copper wire mesh,which can be expressed by the action integral.The lightning protection effect is independent of the specimen size,and is only related to the action integral,the corresponding threshold value of which is about 85218 A2·s.
作者
肖尧
李曙林
尹俊杰
姚学玲
张先航
XIAO Yao;LI Shulin;YIN Junjie;YAO Xueling;ZHANG Xianhang(Aeronautics and Astronautics Engineering College,Air force Engineering University,Xi’an 710038,China;The State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiao Tong University,Xi’an 710049,China)
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2018年第4期109-114,共6页
Journal of Aeronautical Materials
基金
国家自然科学基金(51477132)
关键词
复合材料
铜网防护
雷击防护效果
雷击防护效果
门槛值
composites
copper wire mesh protection
lightning strike protection effect
threshold value
threshold value
