HRB400焊接试样拉伸全过程声发射信号时频能量特征  

Time-frequency and energy characteristics of acoustic emission signals during tensile process of HRB400 welded specimens

作　　者：崔俊[1,2] 赖于树 刘琪[1,2] 孙岩 张东 CUI Jun;LAI Yushu;LIU Qi;SUN Yan;ZHANG Dong(College of Electronic Information and Engineering Chongqing Three Gorges University,Chongqing 404100,China;Key Laboratory of Intelligent Information Processing and Controlling in Universities,Chongqing Three Gorges University,Chongqing 404100,China;College of Civil Engineering,Chongqing Three Gorges University,Chongqing 404100,China;College of Electronic and Electrical Engineering,Chongqing University of Arts and Sciences,Chongqing 402160,China)

机构地区：[1]重庆三峡学院电子信息与工程学院,重庆404100 [2]智能信息处理与控制重庆市高校重点实验室,重庆404100 [3]重庆三峡学院土木工程工程学院,重庆404100 [4]重庆文理学院电子电气工程学院,重庆402160

出　　处：《应用声学》2018年第4期488-495,共8页Journal of Applied Acoustics

基　　金：重庆市基础与前沿研究计划项目(cstc2014jcyj A30006);重庆市教委科技项目(KJ1401022);百科融创产学合作协同育人项目(201602011029);重庆市教育委员会科学技术研究项目(KJ1711280);重庆高校创新团队建设计划项目

摘　　要：为了深入研究未焊透HRB400螺纹钢拉伸全过程声发射信号特征,开展了完整和未焊透试样的拉伸实验,通过SAEU2S型数字声发射系统对损伤特性进行实时监测。结合金属材料力学行为特性,根据计数率将全过程划分成不同的阶段,采用伪Margenau-Hill(PMH)分布进行了时频分析并利用小波包变换对信号进行了能量分析。结果表明:声发射特性参数能够很好地描述焊接对材料力学性能的影响,PMH分布具有良好的时频聚集性,未焊透和完整试样在拉伸过程中的各阶段频域和能量存在显著差异。实验结果为声发射技术应用于钢结构工程未焊透缺陷的识别提供了参考依据。In order to study the acoustic emission signal characteristics of the whole stretching process of HRB400 non-penetration welded threaded steel,tensile tests of intact and non-penetration welded specimens were conducted by using SAEU2S type digital acoustic emission system to monitor the damage characteristics in real time.Combined with mechanical behavior of metallic materials,the whole process is divided into different stages according to the counting rate.The pseudo Margenau-Hill(PMH)distribution and wavelet packet transform are used to analyze the time-frequency domain and energy of the signals.The results show that acoustic emission characteristic parameters can well describe the influence of welding on the mechanical properties of materials.The PMH distribution has good time-frequency aggregation and there is a significant difference in frequency and energy between the welds and the whole sample during the tensile process.The experimental results provide a reference for the application of AE technology in the identification of incomplete penetration defects in steel structure engineering.

关 键 词：HRB400 声发射 未焊透 伪Margenau-Hill(PMH)分布 小波包变换 

分 类 号：TU511.33[建筑科学—建筑技术科学]