钢结构疲劳损伤声发射监测

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。

Acoustic Emission Testing of Fatigue Crack Damage for Steel Bridge Weld

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 reab time monitoring of the development and changes of crack damage state.