基于耦合模式下初始后屈曲分析的复合柱形壳的有限元分析

运用多模式预测方法,基于Koiter初始后屈曲理论提出了一个有限元公式。初始后屈曲理论提供了压力作用下结构缺陷敏感性的直接信息,同时也是非线性降阶模型的理论基础。研究的目的在于说明包含了模态作用在内的壳结构的屈曲承载力分析。利用一部分有代表性的模态模型,对包含非线性前屈曲效应的轴压作用的复合柱形壳进行了耦合模式下的初始后屈曲分析。当结构缺陷较小时,从降阶模型中得到的极限屈曲荷载与从全模型非线性分析中得到的结果具有良好的一致性,这说明可以运用本文提议的方法对带有缺陷的壳结构的耦合模态响应进行快速的预测。

Finite Element Based Coupled Mode Initial Post-Buckling Analysis of a Composite Cylindrical Shell

This paper presents a finite element formulation of Koiter's initial post-buckling theory using a multi-mode approach. Initial post-buckling theory provides direct information about the imperfection sensitivity of a structure under compressive loading, and is also the basis of a nonlinear reduced order model. The objective of the present work is to illustrate the capability of the implementation for buckling analysis of shell structures including modal interaction. A coupled mode initial post-buckling analy...