کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1758660 1523206 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Detection of defect parameters using nonlinear air-coupled emission by ultrasonic guided waves at contact acoustic nonlinearities
ترجمه فارسی عنوان
تشخیص پارامترهای نقص با استفاده از انتشار غیرخطی هوا همراه با امواج هدایت الگوریتم در تماس های غیر خطی صوتی تماس
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم آکوستیک و فرا صوت
چکیده انگلیسی


• We model nonlinear air-coupled emission (NACE) by delaminations under dynamic excitation.
• We study NACE radiation patterns in different orientation planes.
• We illustrate the potential of studying NACE radiation patterns for defect characterization.
• We illustrate the tendency of delaminated layers to vibrate at a local defect resonance (LDR).

Interaction of ultrasonic guided waves with kissing bonds (closed delaminations and incipient surface breaking cracks) gives rise to nonlinear features at the defect location. This causes higher harmonic frequency ultrasonic radiation into the ambient air, often referred to as Nonlinear Air-Coupled Emission (NACE), which may serve as a nonlinear tag to detect the defects. This paper summarizes the results of a numerical implementation and simulation study of NACE. The developed model combines a 3D time domain model for the nonlinear Lamb wave propagation in delaminated samples with a spectral solution for the nonlinear air-coupled emission. A parametric study is conducted to illustrate the potential of detecting defect location, size and shape by studying the NACE acoustic radiation patterns in different orientation planes. The simulation results prove that there is a good determination potential for the defect parameters, especially when the radiated frequency matches one of the resonance frequencies of the delaminated layer, leading to a Local Defect Resonance (LDR).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics - Volume 63, December 2015, Pages 147–154
نویسندگان
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