声发射监控疲劳裂纹扩展的技术研究  

Investigation on Application of Acoustic Emission Technique to Monitor Fatigue Crack Growth

作　　者：黄华斌[1] 彭智伟[1] 王竹林[1] HUANG Huabin;PENG Zhiwei;WANG Zhulin(Aircraft Strength Research Institute of china,Xi’an 710065,China)

机构地区：[1]中国飞机强度研究所,西安710065

出　　处：《无损探伤》2021年第6期13-16,共4页Nondestructive Testing Technology

摘　　要：介绍声发射技术监测疲劳裂纹扩展的试验应用研究。运用声发射技术动态监测的特点对疲劳试验中已发现的疲劳裂纹实时监测其扩展情况,通过合理选择传感器监测位置和定位方式,以疲劳裂纹扩展产生的声发射信号特征参数为基准,对采集到的声发射信号的事件数、频率、幅值、能量、上升时间等参数进行分析并设置滤波器以去除非相关的干扰信号,随后采用空间定位分析获得裂纹尖端的准确位置。结果表明,声发射技术能够及时捕捉到裂纹扩展过程产生的声发射信号及裂纹尖端的准确位置,可以避免由不可测的疲劳裂纹扩展所引起的事故风险,为该部件疲劳定寿和检修提供了试验依据。To gave descriptions investigation on how to use Acoustic Emission technique to monitor fatigue crack growth.To utilize the dynamic monitor character of Acoustic Emission technique to monitor the process of crack growth in fatigue testing.That need select the location of sensor,utilize the character parameter of fatigue crack to analysis the Acoustic Emission signal including events,frequency,amplitudes energy,rise-time,and filter the disturbing signals,then adopt location analysis technique could obtain the tip of fatigue crack during the process of crack growth.These results were proven the technique of Acoustic Emission can exact the process of growth for fatigue crack and the tip of fatigue crack,provide reference to design and overhaul of part.

关 键 词：声发射 疲劳裂纹 裂纹扩展 特征参数 定位分析 

分 类 号：TG115.28[金属学及工艺—物理冶金]