欢迎访问《兵工学报》官方网站,今天是

兵工学报 ›› 2025, Vol. 46 ›› Issue (6): 240537-.doi: 10.12382/bgxb.2024.0537

• • 上一篇    下一篇

叶片高周疲劳裂纹声发射特征试验研究

刘强, 于洋*(), 杨平   

  1. 沈阳工业大学 信息科学与工程学院, 辽宁 沈阳 110870
  • 收稿日期:2024-07-03 上线日期:2025-06-28
  • 通讯作者:
  • 基金资助:
    中国航空发动机集团应用创新项目(630010504); 辽宁省教育厅重点攻关项目(LZGD2019005)

Experimental Study on Acoustic Emission Characteristics of High-cycle Fatigue Cracks in Blades

LIU Qiang, YU Yang*(), YANG Ping   

  1. School of Information Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China
  • Received:2024-07-03 Online:2025-06-28

摘要:

针对叶片高周疲劳裂纹损伤过程无有效在线监测手段的难题,采用声发射新技术开展定幅载荷作用下叶片高周疲劳裂纹声发射在线监测试验研究,探索叶片裂纹萌生、扩展声发射信号特征演化规律。研究高周疲劳裂纹声发射参数、频谱特征,提出裂纹活性系数指标,将叶片高周疲劳裂纹分为裂纹萌生、亚稳态扩展、快速扩展3个阶段,在裂纹萌生结束及裂纹快速扩展阶段,裂纹活性系数明显增加,可以实现裂纹早期预警。采用广义S变换分析裂纹不同损伤阶段声发射信号频谱。研究结果表明:裂纹萌生时信号能量集中在90~160kHz,裂纹扩展时信号能量主要集中在80~180kHz;裂纹快速扩展时在120kHz处出现明显的能量峰值;裂纹快速扩展时信号能量最大,裂纹萌生时能量次之,亚稳态扩展时能量最小。

关键词: 叶片裂纹, 高周疲劳, 声发射, 裂纹活性系数

Abstract:

In view of the problem that there is no effective online monitoring means in the process of blade high-cycle fatigue crack damage,an acoustic emission technology is adopted to study the online monitoring test of blade high-cycle fatigue crack acoustic emission under the action of fixed amplitude load,and explore the evolution law of blade crack initiation and propagation signal characteristics.The acoustic emission parameters and frequency spectrum characteristics of high-cycle fatigue crack are studied,and a crack activity coefficient index (CAI) is proposed.The high-cycle fatigue cracks in blades are divided into three stages,i.e.,crack initiation,metastable propagation,and rapid propagation.At the end of crack initiation and the rapid propagation stage,the crack activity coefficient significantly increases,which can achieve early warning of cracks.The generalized S transform is used to analyze the frequency spectra of acoustic emission signals at different damage stages,The results show that the signal energy is concentrated at 90-160kHz during crack initiation,the signal energy is mainly concentrated at 80-180kHz during the crack propagation,and a distinct energy peak at 120kHz appears during rapid crack propagation,The signal energy is the highest during rapid crack propagation,the energy is higher during crack initiation,and the energy is the lowest during crack metastable propagation.

Key words: blade crack, high-cycle fatigue, acoustic emission, crack activity coefficient

中图分类号: