PZT基体表面电极圆形脱层屈曲研究

发布时间：2018-06-15 05:52

本文选题：电极脱层 + 屈曲　；参考：《苏州大学》2015年硕士论文

【摘要】：随着智能材料的快速发展,由智能材料做成的层合结构功能器件在科研、生活领域得到了很好的应用。然而,层状结构的功能器件在外力作用下往往会在层间界面处产生脱层并发生屈曲,影响功能器件的工作效率,故对存在界面脱层的层状结构受压时的力学行为进行研究对功能器件的结构设计有指导意义。本文建立了金属电极和半无限厚度压电体层合结构的分析模型,用解析方法和有限元数值模拟方法分别从理论和实践上对金属电极和半无限压电体层合结构层间界面处存在的圆形脱层的屈曲问题进行了研究,主要研究了脱层径厚比和压电基体的压电效应对金属电极脱层临界屈曲应变的影响。同时,在有限元数值模拟方法中还研究了结构半径和基体厚度对脱层屈曲载荷的影响。研究结果表明:压电基体的压电效应对金属电极脱层屈曲的影响较小;脱层径厚比较小时,临界屈曲应变较大,随着脱层径厚比的增大,临界屈曲应变迅速降低,之后变化较平缓并逐渐趋于稳定。
[Abstract]:With the rapid development of smart materials, laminated functional devices made of smart materials have been applied in scientific research and life field. However, the delamination and buckling of layered functional devices often occur at the interlaminar interface under external force, which affects the working efficiency of the functional devices. Therefore, the study on the mechanical behavior of layered structures with interfacial delamination is of great significance to the structural design of functional devices. In this paper, an analytical model of metal electrode and semi-infinite thickness piezoelectric laminated structure is established. The buckling problem of circular delamination at the interlaminar interface of a metal electrode and a semi-infinite piezoelectric laminated structure is studied theoretically and practically by using the analytical method and the finite element numerical simulation method, respectively. The influence of the ratio of diameter to thickness of delamination and the piezoelectric effect of piezoelectric matrix on the critical buckling strain of metal electrode delamination was studied. At the same time, the influence of the radius of the structure and the thickness of the matrix on the buckling load of the delamination is also studied in the finite element numerical simulation method. The results show that the piezoelectric effect of piezoelectric matrix has little effect on the delamination buckling of the metal electrode, the critical buckling strain is larger when the delamination thickness is small, and the critical buckling strain decreases rapidly with the increase of the ratio of delamination diameter to thickness. After that, the changes are more gentle and tend to be stable gradually.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB381

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