【摘要】 1-3型压电复合材料在极化处理过程中会出现极化残余应力,基于线性压电理论,采用解析方法研究了极化残余应力对1-3型压电复合材料的横向共振模态的影响·首先建立含有初始应力的平面波波动方程,基于Bloch波函数理论构建了位移和电势函数,从而最终得到方程的解·数值结果表明初始残余应力的出现降低了复合材料的横向振动频率,而材料的压电性则使得横向振动频率提高·初始剪应力对对横向振动的频率影响较小,可以忽略·第一阶及第二阶振动频率将随着初始应力的大小呈线性变化·得出的结论对超声换能器的制作和研究将提供有意义的指导作用·更多还原

【Abstract】 Theoretical analysis of the lateral resonances in 1-3 piezocomposites with poling initial stress was conducted using the Bloch waves theory. Based on the linear piezoelectricity theory, the theoretical formulations including initial stress for the propagation of acoustic plane waves were founded. Numerical calculations were performed to study the effects of the initial stress on the lateral mode frequencies and the stop band. It is found that the lateral mode frequencies increase with the piezoelectricity of the piezocomposites, but decrease with the poling initial stress. The influence of the initial shear stress on the lateral mode frequencies is tiny, thus it can be neglected.更多还原