基于声发射技术的起重机箱型梁疲劳数据分析-中国材料进展

文章信息/Info

Title:: Fatigue Data Analysis of Crane Box Beam Based on Acoustic Emission Technique

作者:: 田乾乾1; 骆红云2; 3; 石多奇1; 康从杰1; （1. 北京航空航天大学能源与动力工程学院，北京 100091）（2. 北京航空航天大学材料科学与工程学院，北京 100091）（3. 北京航空航天大学生物医学工程高级创新中心，北京 100091）

Author(s):: TIAN Qianqian1; LUO Hongyun2; 3; SHI Duoqi1; KANG Congjie1; （1. School of Energy and Power Engineering, Beihang University, Beijing 100091, China) (2. School of Materials Science and Engineering, Beihang University, Beijing 100091, China) (3. Beijing Advanced Innovation Centre for Biomedical Engineering, Beihang University, Beijing 100091, China)

Keywords:: box beam; standard sample; fatigue damage; acoustic emission technique; spectrum analysis

摘要:: 基于声发射技术监测起重机箱型梁疲劳裂纹的扩展，对比Q235B标准试样和箱型梁在疲劳试验中的声发射累积计数/幅值vs循环周次曲线、声发射累积计数/裂纹扩展速率vs应力强度因子幅曲线和声发射信号频谱特征。结果表明：箱型梁和标准试样的声发射累积计数/幅值vs循环周次曲线均呈现基本相似的特征。频谱分析显示，虽然箱型梁和标准试样的声发射累积计数曲线在第二、三阶段产生的主要信号的峰值频率分布范围不尽相同，但是在相应两阶段产生的主要信号的类型（第二阶段2种信号、第三阶段1种信号）、相应频谱的峰数（第二阶段出现单峰和双峰，第三阶段出现多峰）以及两个阶段频谱峰数之间的变化（第三阶段频谱峰数均多于第二阶段）均相似，说明两者的疲劳机制存在着诸多相似之处。因此，一定程度上，能够通过标准试样的疲劳机制来映射箱型梁的疲劳机制，并为大型构件的设计与应用提供指导。

Abstract:: In this paper, acoustic emission technique is used to monitor the fatigue crack growth behavior of crane box beam. Acoustic emission (AE) cumulative count/amplitude vs. cycle times, cumulative count/crack growth rate vs. stress intensity factor amplitude and AE signal spectrum characteristics of Q235B standard sample and crane box beam are compared. The results show that AE cumulative count/amplitude vs. cycle times curves of the box beam and the standard sample display similar characteristics. Spectrum analysis shows that although the corresponding peak frequency distribution range of the main signals generated in the second and third stages of AE cumulative count/amplitude vs. cycles times curve is not the same relatively, the types of main signals generated in the two stages (two kinds of signals in the second stage and one kind of signals in the third stage), the number of peaks of the corresponding spectrum (single peak and bimodal peaks in the second stage and multiple peaks in the third stage) and the change between the spectral peaks of the two stages (the number of spectral peaks in the third stage is more than that of the second stage) are consistent, which indicate that there are many similarities in the fatigue mechanism between them. Therefore, to a certain extent, the fatigue mechanism of crane box beam could be mapped through the fatigue mechanism of the standard sample, which provides guidance for the design and application of large workpieces.