Featured Discovery

Home > Featured Discovery > A Research on the Stability of Stiffened Laminated Composite Plates

A Research on the Stability of Stiffened Laminated Composite Plates

January 13, 2020      Author: School of Navel Architecture, Ocean & Civil Engine

Recently ( January 9th , 2020 ), Professor Qiao Yizhon's team from Department of Engineering, NAOCE (School of Navel Architecture, Ocean & Civil Engine), SJTU published a research paper titled "A novel semi-analytical method for buckling analysis of stiffened laminated composite plates" on journal Thin-Walled Structures, a top journal in the field of structural engineering. This research innovatively solves the classic mechanical problems in engineering for the first time. The reviewers agree that the study is "a unique innovation for a very classical problem."

The first author of this thesis (https://doi.org/10.1016/j.tws.2019.106575) is Huang Sixin, doctoral student of SJTU, and the corresponding author is Professor Qiao Yizhong. The research is sponsored by the National Natural Science Foundation of China (51678360, 51679136).

Abstract

A novel semi-analytical method is presented for buckling analysis of stiffened laminated composite plates with rotationally-restrained edges and under compression and in-plane shear loading. The equivalent model with variable stiffness for stiffened plates is developed, and the Heaviside function is uniquely used to establish the variable stiffness of the stiffened plates along two orthogonal directions. The characteristic equation based on the governing equations of stiffened plates is solved by the Galerkin method. Buckling behavior of stiffened laminated composite plates is obtained and compared with those from both the real geometry and equivalent models by numerical finite element method. Accuracy of the present semi-analytical method is also verified by comparing its predictions with available solutions in literature. A parametric study is conducted to evaluate effects of stiffener geometry, load parameter, and edge rotationally-restrained spring stiffness on buckling behavior of stiffened plates. Finally, practical application of the present semi-analytical method is demonstrated, considering the cross-sectional geometries and material properties of stiffeners, number of stiffeners, and buckling behavior of stiffened plates.

Paper Link: https://doi.org/10.1016/j.tws.2019.106575

 

Translated by Fu Jing       Reviewed by Wang Bingyu