频散瑞利波纵向衰减规律研究

The study of vertical attenuation of dispersive Rayleigh waves

摘要: 理论推导了有液体层时瑞利波能量沿纵向的衰减公式,利用在金属铝板中的方形人工槽进行了相应超声实验验证,理论计算值与实验值吻合较好,并实验证实了有液体层时与无液体层时瑞利波速的差别,讨论了瑞利波衰减规律在实际检测中的作用.

Abstract: The formula of Rayleigh wave's vertical energy attenuation in a semi-infinite substrate with a fluid layer is derived.It is tested and verified by ultrasonic experiment in aluminum plates with man-made slots.A quantitative agreement is obtained between experiment and theory.The velocity difference between Rayleigh waves with a fluid layer and without a fluid layer is verified by the experiment also.Some functions of Rayleigh wave's attenuation rule in actual application are discussed.