CAJ | 학술논문

对预制的含有未焊透缺陷的16MnR焊接矩形试样,进行了室内声发射试验.分析了试验中记录的试样拉伸曲线和声发射信号,阐述了试样声发射信号的分布情况和相应的应力状况.通过缺陷的断裂力学计算,预测了产生大量声发射信号的应力值,将声发射信号的产生和试样所受的应力状况有效地联系起来,对含缺陷容器的声发射检测有一定的指导作用.选择合适的小波函数,分析了试验中声发射信号的不同参量,对比了声发射信号不同参量在小波分析中的差异,得出了声发射信号的时域内分布特征和相应的应力状况.
대예제적함유미한투결함적16MnR한접구형시양,진행료실내성발사시험.분석료시험중기록적시양랍신곡선화성발사신호,천술료시양성발사신호적분포정황화상응적응력상황.통과결함적단렬역학계산,예측료산생대량성발사신호적응력치,장성발사신호적산생화시양소수적응력상황유효지련계기래,대함결함용기적성발사검측유일정적지도작용.선택합괄적소파함수,분석료시험중성발사신호적불동삼량,대비료성발사신호불동삼량재소파분석중적차이,득출료성발사신호적시역내분포특정화상응적응력상황.
Acoustic emission tests for a prepared 16 MnR rectangle plate with welding defects were carried out in laboratory. The main objective is to analyze the acoustic emission signal and the tension curve of specimen and to elaborate the acoustic emission signal distribution and corresponding stress state. Based on cracking stress calculation in fracture mechanics, the prediction of stress value corresponding large amount accoustic emission signals was made, which effectively relates the generation of acoustic emission signals with spesimen stress state. This may direct the acoustic emission inspection for vessels with defects. Selecting a suitable wavelet function, the different parameters of acoustic emission signal generated in tension test were analyzed, and the difference between different acoustic emission signals parameters in wavelet analysis was compared, finally, the signal distribution characteristics in time domain and the corresponding stress state were found out.