文章信息/Info

Title:

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

文章編號:

1674-3962(2020)05-0373-06

作者:

田乾乾1; 駱紅云2; 3; 石多奇1; 康從杰1

（1. 北京航空航天大學 能源與動力工程學院，北京 100091）（2. 北京航空航天大學 材料科學與工程學院，北京 100091）（3. 北京航空航天大學 生物醫(yī)學工程高級創(chuàng)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)

關鍵詞:

箱型梁; 標準試樣; 疲勞損傷; 聲發(fā)射技術; 頻譜分析

Keywords:

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

分類號:

TH215

DOI:

10.7502/j.issn.1674-3962.201906044

文獻標志碼:

A

摘要:

基于聲發(fā)射技術監(jiān)測起重機箱型梁疲勞裂紋的擴展，對比Q235B標準試樣和箱型梁在疲勞試驗中的聲發(fā)射累積計數(shù)/幅值vs�毖�環(huán)周次曲線、聲發(fā)射累積計數(shù)/裂紋擴展速率vs�睉�力強度因子幅曲線和聲發(fā)射信號頻譜特征。結(jié)果表明：箱型梁和標準試樣的聲發(fā)射累積計數(shù)/幅值vs�毖�環(huán)周次曲線均呈現(xiàn)基本相似的特征。頻譜分析顯示，雖然箱型梁和標準試樣的聲發(fā)射累積計數(shù)曲線在第二、三階段產(chǎn)生的主要信號的峰值頻率分布范圍不盡相同，但是在相應兩階段產(chǎn)生的主要信號的類型（第二階段2種信號、第三階段1種信號）、相應頻譜的峰數(shù)（第二階段出現(xiàn)單峰和雙峰，第三階段出現(xiàn)多峰）以及兩個階段頻譜峰數(shù)之間的變化（第三階段頻譜峰數(shù)均多于第二階段）均相似，說明兩者的疲勞機制存在著諸多相似之處。因此，一定程度上，能夠通過標準試樣的疲勞機制來映射箱型梁的疲勞機制，并為大型構件的設計與應用提供指導。

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.