Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第21卷    第4期    总第145期    2011年4月

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文章编号:1004-0609(2011)04-0727-06
基于非线性超声调制频谱识别铝合金板材的疲劳裂纹
高桂丽1,李大勇1, 2,石德全1,董静薇2

(1. 哈尔滨理工大学 材料科学与工程学院,哈尔滨 150040;
2. 哈尔滨理工大学 测控技术与通信学院,哈尔滨 150040
)

摘 要: 基于非线性超声调制频谱法,对航空铝合金板材中的疲劳裂纹识别进行研究;以两个不同频率的超声兰姆波为激励信号,依靠超声换能器、波形发生器和激光测振仪等,对含有疲劳裂纹和无损伤的2024-T351铝合金薄板试样进行对比实验;分别采用时域、频域和时频域联合法分析非线性超声波在铝合金薄板试样中传播的响应信号。结果表明:非线性声学特征即调制频谱及三阶谐波可作为识别2024-T351铝合金板材介质中疲劳裂纹的判据,通过对试样表面进行扫描,建立调制频谱的峰值幅度与位移的关系,据此可确定样板中疲劳裂纹的位置和轮廓,这为航空铝合金板材疲劳裂纹的识别提供更多技术支撑。

 

关键字: 2024铝合金;薄板;非线性声学特征;调制频谱;疲劳裂纹

Identification of fatigue cracks in aluminum alloy plates based on nonlinear ultrasonic modulation spectrum
GAO Gui-li1, LI Da-yong1, 2, SHI De-quan1, DONG Jing-wei2

1. School of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China;
2. School of Measurement-Control Technology and Communications Engineering,
Harbin University of Science and Technology, Harbin 150040, China

Abstract:The identification of fatigue cracks in the aviation aluminum alloy plates based on nonlinear ultrasonic modulation spectrum method was studied. Taking two different frequencies nonlinear Lamb wave as actuators, comparative experiments on two types of 2024-T351 aluminum alloy plate samples, with and without fatigue crack, were performed by using ultrasonic transducer, waveform generator and non-contact laser vibration meter and so on. The ultrasonic response signals during propagation were analyzed by the time domain, frequency domain and time-frequency domain methods, respectively. The results show that the acoustic characteristic of the modulation frequency components and the third harmonics can be used to indicate the presence of fatigue cracks in 2024-T351 aluminum alloy plates. By scanning the cracked plate, a relationship between the modulation frequency peak magnitude and scanning displacement was established, and according to this relationship the fatigue cracks can be located approximately, the crack contour can be obtained, which will provide more technical support for identification fatigue cracks in aviation aluminum alloy plate.

 

Key words: 2024 aluminum alloy; plates; nonlinear acoustic characteristic; modulation spectrum; fatigue cracks

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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