The free vibration frequency responses of the laminated composite structure with a cut-out of variable shapes (square/circular/elliptical), position (center/eccentric) and orientation (parallel/inclined) are investigated for the first time in this research including geometrical shapes. The eigenvalues are obtained computationally for the cut-out borne structure via a linear isoparametric finite element model of the composite structure in association with cubic-order of displacement kinematics. Also, a coupled code is prepared in MATLAB environment by joining the higher-order formulation and the simulation model (ABAQUS) to achieve the generic form to investigate the influential cut-out parameter (shape, size and position) on their eigenvalues. Further, a series of experimentations are carried out using the cut-out borne composite panel and compared with the computational frequency, including the experimental properties. Finally, the key behavior is surveyed through different kinds of numerical examples for various design constraint parameters including the cut-out relevant factors (shape, position and orientation) to show the subsequent inclusiveness of the proposed model.

中文翻译：

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切割参数对层压复合材料模态响应的作用的实验验证——一种耦合有限元方法

本研究首次研究了具有可变形状（方形/圆形/椭圆形）、位置（中心/偏心）和方向（平行/倾斜）切口的层压复合结构的自由振动频率响应，包括几何形状。形状。通过复合结构的线性等参有限元模型与位移运动学的三次阶相关联，以计算方式获得切割承载结构的特征值。此外，在 MATLAB 环境中，通过将高阶公式和仿真模型 (ABAQUS) 结合起来，编写了一个耦合代码，以实现通用形式，以研究对其特征值有影响的剪切参数（形状、大小和位置）。进一步，使用切割承载的复合板进行了一系列实验，并与计算频率进行了比较，包括实验特性。最后，通过各种设计约束参数（包括切割相关因素（形状、位置和方向））的不同类型的数值示例来调查关键行为，以显示所提出模型的后续包容性。