复合固体层中兰姆波的声场分析

基于弹性导波的部分平面波分析方法，对复合固体层中兰姆波的声场分布问题进行了研究。在对称的复合固体层中传播的兰姆波模式可以是对称的或反对称的；在非对称的复合固体层中传播的兰姆波模式是非对称的。针对常见的固体层－粘结层－固体层结构中兰姆波的色散关系及声场分布等进行了数值分析，所得结果对兰姆波应用于复合固体层的无损评价具有实际意义。

ANALYSIS OF THE ACOUSTIC FIELDS OF LAMB WAVES IN SOLID COMPOSITE LAYERS

Based on the analysis method of partial plane waves of elastic guided waves, the acoustic fields of Lamb waves in solid composite layers were analyzed. The results showed that Lamb waves in symmetric solid composite layers might be symmetrical or antisymmetrical, and Lamb waves in nonsymmetric solid composite layers were nonsymmetrical. For solid composite layers (solid adhesive solid structure), the numerical analyses regarding the dispersion relationship and acoustic field distribution of Lamb waves were carried out. The results are of practical significance in the application of Lamb waves for the nondestructive evaluation of solid composite layers.