Free vibration analyses of multiple delaminated angle-ply composite conical shells - A finite element approach
- 作者：Sudip Dey ; infosudip@gmail.com ; Amit Karmakar
- 关键词：Angle-ply ; Conical shell ; Multiple delamination ; Finite element
- 刊名：Composite Structures
- 出版年：2012
- 期刊代码：15_02638223
- 类别：ms
- 出版时间：June, 2012
- 卷：94
- 期：7
- 页码：2188-2196
- 文件大小：1133 K
摘要
In this paper, the finite element method is employed to investigate the effects of delamination on free vibration characteristics of graphite-epoxy pretwisted shallow angle-ply composite conical shells. The generalized dynamic equilibrium equation is derived from Lagrange鈥檚 equation of motion neglecting Coriolis effect for moderate rotational speeds. The theoretical formulation is based on the Mindlin鈥檚 theory and the multi-point constraint algorithm is considered for an eight noded isoparametric plate bending element. The standard eigenvalue problem is solved by applying the QR iteration algorithm. The mode shapes are also depicted for a typical laminate configuration. Non-dimensional natural frequencies obtained are the first known results for the type of analyses carried out here.