کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4976783 1451836 2018 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Second harmonic generation at fatigue cracks by low-frequency Lamb waves: Experimental and numerical studies
ترجمه فارسی عنوان
تولید دوم هارمونیک در ترکهای خستگی با امواج لام فرکانس کم: مطالعات تجربی و عددی
کلمات کلیدی
موج شانه غیر خطی، هارمونی دوم، ترک خستگی تماس با غیر خطی، روش عنصر محدود مطالعه تجربی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر پردازش سیگنال
چکیده انگلیسی


- Second harmonic generation at fatigue cracks is investigated.
- 3D finite element simulations are validated using experimental data.
- Effect of the wave modes on the generation of second harmonics is investigated.
- Parametric study is carried to study second harmonic generation at fatigue cracks.
- The results gain physical insight into the second harmonic generation.

This paper presents experimental and theoretical analyses of the second harmonic generation due to non-linear interaction of Lamb waves with a fatigue crack. Three-dimensional (3D) finite element (FE) simulations and experimental studies are carried out to provide physical insight into the mechanism of second harmonic generation. The results demonstrate that the 3D FE simulations can provide a reasonable prediction on the second harmonic generated due to the contact nonlinearity at the fatigue crack. The effect of the wave modes on the second harmonic generation is also investigated in detail. It is found that the magnitude of the second harmonic induced by the interaction of the fundamental symmetric mode (S0) of Lamb wave with the fatigue crack is much higher than that by the fundamental anti-symmetric mode (A0) of Lamb wave. In addition, a series of parametric studies using 3D FE simulations are conducted to investigate the effect of the fatigue crack length to incident wave wavelength ratio, and the influence of the excitation frequency on the second harmonic generation. The outcomes show that the magnitude and directivity pattern of the generated second harmonic depend on the fatigue crack length to incident wave wavelength ratio as well as the ratio of S0 to A0 incident Lamb wave amplitude. In summary, the findings of this study can further advance the use of second harmonic generation in damage detection.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanical Systems and Signal Processing - Volume 99, 15 January 2018, Pages 760-773
نویسندگان
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