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首页> 外文期刊>Journal of the Institution of Engineers (Inida) >Effect of Multiple Delamination on Free Vibration Behaviour of Quasi-Isotropic Composite Conical Shells
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Effect of Multiple Delamination on Free Vibration Behaviour of Quasi-Isotropic Composite Conical Shells

机译：多次分层对准各向同性复合锥壳自由振动行为的影响

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摘要

In this paper, a finite element method is employed to investigate the free vibration characteristics of single and multiple delaminated graphite-epoxy quasi-iso-tropic composite conical shells. The generalized dynamic equilibrium equation is derived from Lagrange's equation of motion neglecting Coriolis effect for moderate rotational speeds. The formulation is based on Mindlin's theory considering eight-noded isoparametric plate bending element. The multipoint constraint algorithm is employed to ensure the compatibility of deformation and equilibrium of resultant forces and moments at the delamination crack front. The QR iteration algorithm is utilized for solution of standard eigen value problem. Finite element codes are developed to obtain the natural frequencies of single and multiple delaminated quasi-isotropic composite conical shells. The mode shapes for a typical laminate configuration are also depicted. Numerical results obtained are the first known values which could serve as reference solutions for the future investigators.
机译：本文采用有限元方法研究了单层和多层分层的石墨-环氧树脂准各向同性复合圆锥壳的自由振动特性。广义的动平衡方程是从拉格朗日的运动方程中得出的，该运动方程忽略了中等转速下的科里奥利效应。该公式基于Mindlin理论，其中考虑了八节点等参板弯曲单元。采用多点约束算法来确保变形的兼容性以及在分层裂纹前沿的合力和力矩的平衡。 QR迭代算法用于解决标准特征值问题。开发了有限元代码以获得单层和多层分层的各向同性复合圆锥壳的固有频率。还描述了典型层压结构的模态形状。获得的数值结果是第一个已知值，可以作为未来研究人员的参考解决方案。

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