Mode Identification and Application for Nondestructive Evaluation of Thin Aluminum Sheet by Lamb Waves
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摘要: 在厚度为0.7 mm的铝板上制作直径为 0.6~1.8 mm的通孔, 以模拟薄铝板中的孔洞类缺陷。利用Matlab软件绘制了Lamb波的频散曲线和质点位移-幅度曲线。根据频散曲线和质点位移-幅度曲线, 选择S0模态的Lamb波。试验结果表明, S0模态Lamb波的信号峰值与缺陷大小具有良好的对应关系。Abstract: The holes with different diameters were made in thin aluminum sheet with thickness of 0.7 mm to simulate the hole-class defects. Frequency dispersion curves and particle displacement curves were drawn by software Matlab. Based on frequency dispersion curves and particle displacement curves, S0 mode wave was selected out. Experimental results showed that good corresponding relationship between amplitude of S0 mode wave and size of the given defect existed.
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