Acoustic Emission Testing of Fatigue Crack Damage for Steel Bridge Weld
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摘要: 采用声发射技术对已开裂的焊缝进行监测,实现了在复杂的环境噪声中识别出裂纹活动信号。通过分析疲劳裂纹损伤产生的原因以及材料在交变载荷作用下产生声发射的机理,得到表征焊缝裂纹活动过程的信号特征。试验表明,声发射技术对钢结构裂纹损伤的活度、强度具有较大的敏感性,可以实现对裂纹损伤状态发展变化的实时监测。Abstract: Weld fatigue crack constraints life of steel structure. The monitoring of crack initiation, development process and the impact factors has great significance. In this paper, the acoustic emission monitoring of weld cracking, crack activities was identified in the complex environment noise signal. By analysis of the causes of fatigue crack damage as well as materials in alternating loads under the mechanism of acoustic emission the signal characteristics for characterizing the weld cracks activity process were obtained. It is shown that acoustic emission technique is rather sensitive to the steel crack damage activity and strength, and acoustic emission can achieve real-time monitoring of the development and changes of crack damage state.
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Keywords:
- Acoustic emission /
- Crack damage /
- Real-time monitoring
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[1] 耿荣生,吴克勤,景鹏,等.全尺寸飞机机体疲劳试验时中央翼与外翼连接区域疲劳损伤的声发射监测.无损检测, 2008,30(1):145-148. [2] 沈功田,戴光,刘时风.中国声发射检测技术进展学会成立25周年纪念[J].无损检测,2003,25(6):302-307. [3] 耿荣生,李伟.飞机主梁疲劳裂纹萌生声发射信号的识别方法[J].航空学报,1996,17(3):368-372. [4] 沈功田,耿荣生,刘时风.声发射信号处理和分析技术[J].无损检测,2002,24(1):23-28. [5] 沈功田,耿荣生,刘时风.声发射信号的参数分析方法[J].无损检测,2002,24(2):72-77. [6] 沈功田,耿荣生,刘时风.声发射源定位技术[J].无损检测,2002,24(3):114-117. [7] 沈功田,耿荣生,刘时风.连续声发射信号的源定位技术[J].无损检测,2002,24(4):164-167. [8] 耿荣生,沈功田,刘时风.模态声发射基本理论[J].无损检测,2002,24(7):302-306. [9] 李光海,刘时风,耿荣生,等.声发射源特征识别的最新方法[J].无损检测,2002,24(12):534-538. [10] 耿荣生,沈功田,刘时风.基于波形分析的声发射信号处理技术[J].无损检测,2002,24(6):257-261.
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