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Vibration analysis of rotating delaminated non-uniform composite plates

机译：旋转分层不均匀复合板的振动分析

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In this study, the free and forced vibration responses of rotating delaminated thickness tapered (non-uniform) composite plates are investigated. The governing differential equations of motion of the various models of a rotating mid-plane delaminated thickness tapered laminated composite plate are presented in the finite element formulation based on classical laminated plate theory (CLPT) including the various rotational effects. The finite element formulation developed for the free vibration analysis of rotating delaminated tapered composite plate is validated by comparing the natural frequencies evaluated using the present finite element method (FEM) with those obtained from the experimental measurements. Various parametric studies are also performed to study the effect of taper models, rotational speed, length and location of delamination on the dynamic characteristics of the tapered composite structure. It was observed that the percentage of decrease in natural frequencies of delaminated composite plate when compared to intact composite plate at lower modes is lesser than those compared to higher modes irrespective taper models and rotating speeds considered. Further, it was noticed that the decreasing percentage of natural frequencies of the mid-plane delaminated different taper models of composite plate over intact plate increase in the order of TM2, TM1, TM3 and uniform composite. (C) 2016 Elsevier Masson SAS. All rights reserved.
机译：在这项研究中，研究了旋转分层厚度渐缩（非均匀）复合材料板的自由振动和强迫振动响应。基于经典层压板理论（CLPT）的有限元公式，给出了旋转中平面分层厚度渐缩的层压复合板的各种模型的运动控制微分方程，其中包括各种旋转效应。通过将使用本有限元方法（FEM）评估的固有频率与从实验测量中获得的固有频率进行比较，可以验证为旋转分层层压复合板的自由振动分析而开发的有限元公式。还进行了各种参数研究，以研究锥度模型，旋转速度，分层的长度和位置对锥形复合结构动力特性的影响。观察到，与低密度模式下的完整复合板相比，分层复合板的固有频率降低的百分比小于高模式下的分层复合板固有频率的降低百分比，而与所考虑的锥度模型和转速无关。此外，注意到，复合板相对于完整板的中平面分层的不同锥度模型的固有频率的降低百分比按TM2，TM1，TM3和均匀复合材料的顺序增加。 （C）2016 Elsevier Masson SAS。版权所有。

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