【摘要】 基于线性压电弹性理论,利用传递矩阵法,分析了功能梯度压电材料层状结构中的SH波传播特性,研究了压电梯度覆盖层中初始应力对SH波传播的影响。压电覆盖层的材料性能如弹性、压电、介电系数和密度沿厚度方向呈梯度变化。数值分析结果表明,适当的材料梯度分布,可使SH波倾向于沿覆盖层表面传播,由此能够获得更好的机电耦合性能;同时,初始应力使得波传播的相速度减小,但增大了机电耦合系数。文中的分析方法和结论,对固体火箭发动机超声探伤及其压电类传感器的研制和选择有一定的参考意义。更多还原

【Abstract】 Based on the linearly piezoelectric theory, SH wave propagation in laminated structure of functionally gradient piezoelectric material (FGPM) was analyzed by means of the transfer matrix method, and the effect of initial stress in the piezoelectric gradient coverage layer on SH wave propagation was investigated. The material properties of piezoelectric coverage layer present gradient change along the thickness, such as elasticity, piezoelectricity, dielectric coefficient and density. Numerical analysis results show that SH waves in the appropriate gradient distribution material would tend to propagate along the surface of the layer so as to obtain the better electromechanical coupling performance, and initial stress can cause a reduction of wave propagation velocity, but an increase of electromechanical coupling coefficient. The analysis methods and conclusions will provide a reference for ultrasonic inspection of solid rocket motor, and development and selection of piezoelectric sensors.更多还原