疲劳裂纹的声发射信号检测技术  

Detecting Acoustic Emission Signals from Fatigue Crack Propagation

作　　者：李耀东[1] 黄成祥[1] 侯力[1] 王小龙[1] 

机构地区：[1]四川大学制造学院,四川成都610065

出　　处：《计算机测量与控制》2004年第6期504-506,共3页Computer Measurement &Control

基　　金：四川省科技厅应用基础基金资助项目(D302GY029-051)

摘　　要：疲劳裂纹的萌生和扩展是机械零件在变载荷作用下的主要失效形式。使用近几年来得到迅速发展的模态声发射技术获取疲劳裂纹的声发射波形,使接收到的声发射信号与声发射源的物理状态相关。在波形分析中采用参数分析法提取波形特征,建立声发射参数和裂纹扩展速度之间的关系。由于综合采用了多种技术进行信号分析,由信号特征得到的结果将更为准确。The origination and propagation of fatigue crack in mechanical elements under variable load is the main style of failure. In this paper, the modal acoustic emission (MAE) that has taken rapid development in recent years, is adopted to precisely acquire the AE signal waveform. In this way the received AE signal can be directly related with the genuine physical state of the AE sources. To extract the features of the detected crack, two equations are cited to set up the correlation between AE parameters and crack propagation velocity. Based on the MAE technique and parameter analysis technique, the obtained result is considered to be more accurate.

关 键 词：机械零件 疲劳裂纹 声发射信号检测技术 谐振式传感器 参数分析法 

分 类 号：TH13[机械工程—机械制造及自动化] TG115.28[金属学及工艺—物理冶金]