文献类型：期刊文献

英文题名：Nonlinear interaction of Lamb waves with fatigue cracks in metal plates under the condition of phase-velocity mismatching

作者：Sun, Di[1]; Zhu, Wujun[1]; Xiang, Yanxun[1]

机构：[1] Shanghai Key Laboratory of Intelligent Sensing and Detection Technology, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2024

卷号：2822

期号：1

外文期刊名：Journal of Physics: Conference Series

收录：EI(收录号：20244617347754)

语种：英文

外文关键词：Fatigue crack - Fatigue crack propagation - Fatigue damage - Gravity waves - Plate metal - Seismic waves - Shock waves - Surface waves - Ultrasonic waves

摘要：Nonlinear Lamb waves have been widely acknowledged as an efficient method for evaluating material damage at an early stage. However, due to the dispersive and multimode natures of Lamb waves, nonlinear Lamb waves with exact/approximate phase-velocity matching have been employed in previous research solely for the evaluation of fatigue cracks. Second harmonic Lamb waves can be generated from the contact acoustic nonlinearity (CAN) induced by the ''breathing'' effect of fatigue cracks. This paper presents a verification of the second harmonic S0 mode Lamb waves due to fatigue crack CAN, despite the mismatch in phase velocity between this mode and the primary S0 mode Lamb waves. This verification is achieved through both simulation and experiment. Consequently, the generation of double-frequency Lamb waves by fatigue cracks under conditions of phase velocity mismatching is validated. Furthermore, the phase-velocity mismatching method is anticipated to exclude material nonlinearity in the detection of fatigue cracks. This method offers a potential for accurate detection and evaluation of fatigue cracks. ? 2024 Institute of Physics Publishing. All rights reserved.