疲劳裂纹摩擦声发射信号特性研究  

Research on Friction Acoustic Emission Signal Characteristics of Fatigue Crack

作　　者：郭涛[1] 梁颖 张程杰 石帅 啜燕军 GUO Tao;LIANG Ying;ZHANG Chengjie;SHI Shuai;CHUO Yanjun(Key Laboratory of Instrument Science and Dynamic Measurement(Ministry of Education),North University of China,Taiyuan 030051;China Academy of Launch Vehicle Technology,Beijing 100000)

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,太原030051 [2]中国运载火箭技术研究院,北京100000

出　　处：《计算机与数字工程》2024年第5期1423-1427,共5页Computer & Digital Engineering

基　　金：国家自然科学基金项目(编号:51975541)资助。

摘　　要：由于声发射波的产生、传播以及与结构相互作用的复杂性,使得声发射波形分析变得困难。为了降低裂纹扩展监测过程中疲劳裂纹摩擦信号的干扰,文章对金属构件裂纹摩擦引起的声发射(AE)信号进行了剖析。通过给予含预制裂纹试件30 Hz与180 Hz的振动激励,对裂纹结合面运动进行诱导,从而产生声发射信号。用多个距裂纹不同距离的R15a换能器记录不同共振频率下的声发射信号,剖析所记录波形。在不同共振条件下,变化的裂纹结合面运动会引发具备不同特征的声发射信号。通过多传感器实验,对离裂纹不同距离处裂纹摩擦声发射信号差异及其几何传播规律进行了研究与总结。Due to the complexity of acoustic emission wave generation,propagation and interaction with structure,acoustic emission waveform analysis becomes difficult.In order to reduce the interference of fatigue crack friction signals in the process of crack growth monitoring,the acoustic emission(AE)signals caused by crack friction of metal components are analyzed.By provid-ing 30 Hz and 180 Hz vibration excitation to the specimen with prefabricated crack,the motion of crack bonding surface is induced,and acoustic emission signals are generated.Several R15a transducers with different distances from the crack are used to record acoustic emission signals at different resonant frequencies,and the recorded waveform is analyzed.Under different resonance condi-tions,the acoustic emission signals with different characteristics are induced by the motion of the varying crack interface.Through multi-sensor experiments,the differences of friction acoustic emission signals and their geometric propagation laws at different dis-tances from the crack are studied and summarized.

关 键 词：疲劳裂纹 摩擦 声发射 波形分析 高强度合金铝 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]