【摘要】 准晶材料结构在制备过程中会出现裂缝、夹杂等缺陷，超声导波具有多模态和频散特性，能够很好识别结构中的微细裂纹等缺陷，但应用超声导波无损检测技术的先决条件是深刻认识结构中导波的传播与衰减特性。基于此，提出一种改进的勒让德多项式级数法，无需迭代便能得到Bak模型和弹性/流体动力学模型下波动力学方程的解析解。计算得到一维六方准晶板中Lamb波的频散曲线、声子和相子场位移分布，研究两种模型下声-相耦合效应对波动特性的影响。结果表明：Bak模型中声-相耦合效应对声子模态有微弱影响，对相子模态有显著影响；弹性/流体动力学模型中声-相耦合效应对不传播的相子模态有显著影响，对声子模态没有影响。所得结果为一维六方准晶板的导波无损检测提供了一定的理论基础。更多还原

【Abstract】 Due to its high brittleness,quasi-crystal structures are very sensitive to defects in the materialpreparation,such as cracks and inclusions. Ultrasonic guided waves are of multi-mode and dispersion char-acteristics,and can be used to identify the micro-cracks and other defects in the structure. However,the pre-requisite utilizing them is a deep understanding of their propagation and attenuation characteristics. Accord-ingly,wave dynamic equations were derived in the context of the Bak’s and elastohydrodynamic models. Animproved Legendre polynomial series approach was developed to obtain analytic solutions without iteration.The dispersion curves,phonon,and phason displacement distributions of Lamb wave in the 1-D hexagonalquasi-crystal plate were illustrated. The phonon-phason coupling effect on the wave characteristics was in-vestigated. The results demonstrated that,the phonon-phason coupling effect in the context of the Bak’smodel on phonon modes was extremely weak,and significant on phason modes;The phonon-phason couplingeffect in the context of elastohydrodynamic model had significant influence on the non-propagating phason modes,without affecting phonon modes. A theoretical basis for the guided wave non-destructive testing on1-D hexagonal quasi-crystal plates was provided by the results.更多还原