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研究黏弹性胶粘涂层/基底结构中激光激发类瑞利波的传播特性。考虑涂层及基底的黏弹性,在频域中建立环氧树脂涂层/铝基底、环氧树脂涂层/铜基底、环氧树脂涂层/泡沫基底等结构中激光激发类瑞利波的有限元数值模型,研究类瑞利波的波形及传播特性,并分析环氧树脂涂层的透明性、厚度、黏性与基底的黏性对类瑞利波传播特性的影响,在此基础上,结合理论计算的色散与衰减曲线进行验证。研究结果表明,涂层的黏性引起类瑞利波高频成分的衰减,而对低频成分没有影响;基底的黏性对类瑞利波的高频与低频成分的衰减均有影响,其中对低频成分影响较大,此外,类瑞利波的模式及频散特性与基底材料密切相关。本研究为反演黏弹性胶粘涂层/基底结构的力学参数及评估结构的粘接质量提供理论指导。
Study on the Propagation Characteristics of Laser-excited Rayleigh Wave in Viscoelastic Adhesive Coating / Substrate Structure. Taking into account the viscoelasticity of the coating and the substrate, a laser-excited Rayleigh wave of a structure such as an epoxy resin coating / aluminum substrate, an epoxy resin coating / copper substrate, an epoxy resin coating / The finite element numerical model is used to study the wave shape and propagation characteristics of the Rayleigh wave. The influence of the transparency, thickness, viscosity and substrate viscosity of the epoxy resin coating on the Rayleigh wave propagation characteristics is also analyzed , Combined with theoretical calculations of dispersion and attenuation curve to verify. The results show that the viscosity of the coating causes the attenuation of the high frequency components and the low frequency components of the Rayleigh wave. The viscosity of the substrate affects the attenuation of the high and low frequency components of the Rayleigh waves. In addition, the mode and dispersion characteristics of Rayleigh waves are closely related to the substrate material. This study provides theoretical guidance for retrieving the mechanical parameters of viscoelastic adhesive coating / substrate structure and evaluating the bonding quality of the structure.