桥式起重机Q345B钢箱形梁母材疲劳损伤的声发射双谱分析  

Acoustic emission technique based bi-spectrum analysis of fatigue damage of parent metal for Q345B steel box girder of optic bridge crane

作　　者：杨浩宇 骆红云[1] 陈国伟 李福森 贾华龙 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083 [2]国家起重运输机械质量监督检验中心,北京100007

出　　处：《起重运输机械》2018年第1期67-72,共6页Hoisting and Conveying Machinery

基　　金：国家科技支撑计划资助;项目名称"桥式起重机械轻量化共性技术研究"(2015BAF06B01)

摘　　要：利用声发射技术对比研究了Q345B钢桥式起重机箱形梁和同种金属结构材料实验室小试样的疲劳过程,采用双谱分析方法分析声发射信号,结果发现两种试样在疲劳失效过程中产生的声发射信号与疲劳断裂损伤状态存在对应关系,为采用声发射技术监测桥式起重机的安全状态奠定重要理论和技术基础。In the paper, acoustic emission technique is used to compare the fatigue process of the Q345B steel box girder of bridge crane and the sample made of the same metal structural materials in laboratory, and bi-spectrum analysis method is used to analyze acoustic emission signals. The results show that there is a relation between the acoustic emission signals generated during thtigue failure and fatigue fracture damage of the two samples, which lays an important theoretical and technical foundation for monitoring the safety status of the bridge crane with acoustic emission technology.

关 键 词：桥式起重机 箱形梁 声发射技术 双谱分析 疲劳损伤 

分 类 号：TH215[机械工程—机械制造及自动化]