The problem of local buckling delamination around interface edge cracks in a sandwich PZT/Metal/PZT rectangular thick plate is studied within the scope of the 3D linearized buckling instability theory. Crack faces have an insignificant initial imperfection, and the plate is compressed by uniformly distributed normal forces acting on two opposite ends of the plate. The evolution of the initial imperfection is investigated, and the critical buckling forces for the plate are found. A mathematical modeling of the problem considered is performed using the 3D exact geometrically nonlinear electroelasticity theory within the framework of a piecewise homogeneous body model. The corresponding boundary-value problems are solved numerically by employing a 3D finiteelement method. Numerical results for the critical forces and the effect problem parameters on these forces are presented and discussed.

中文翻译：

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具有界面边缘裂纹的压电三明治矩形板屈曲分层的 3D FEM 分析

在3D线性屈曲失稳理论的范围内研究了夹层PZT/Metal/PZT矩形厚板界面边缘裂纹周围局部屈曲分层问题。裂纹面有一个微不足道的初始缺陷，板被作用在板的两个相对端上的均匀分布的法向力压缩。研究了初始缺陷的演变，并找到了板的临界屈曲力。在分段均匀体模型的框架内，使用 3D 精确几何非线性电弹性理论对所考虑的问题进行数学建模。相应的边值问题通过采用 3D 有限元方法进行数值求解。