This paper presents the free vibration analysis of a composite laminated square plate with complicated cutout. The problem formulation is based on the higher order shear deformation plate theory HDST C⁰ coupled with a curved quadrilateral p-element. The elements of the stiffness and mass matrices are calculated analytically. The curved edges are accurately represented using the blending function method. A calculation program is developed to determine the fundamental frequencies for different physical and mechanical parameters such as the cutout shape, plate thickness, fiber orientation angle, and boundary conditions. The results obtained show a good agreement with the available solutions in the literature. New results for the fundamentals frequencies of a composite laminated plate with complicated cutout are presented.

本文提出了具有复杂切口的复合层合矩形板的自由振动分析。问题公式基于高阶剪切变形板理论HDST C ⁰加上弯曲的四边形p元素。刚度和质量矩阵的元素通过解析计算。使用混合函数方法可以准确地表示弯曲的边缘。开发了一个计算程序来确定不同物理和机械参数（例如切口形状，板厚，纤维取向角和边界条件）的基频。获得的结果表明与文献中的可用解决方案有很好的一致性。提出了具有复杂切口的复合层合板的基本频率的新结果。