文档介绍：International Journal of Non-Linear Mechanics 37 (2002) 623–643
Eects of imperfections on the buckling response of
compression-posite shells
Mark W. Hilburger ∗, James H. Starnes Jr.
NASA Langley Research Center, Hampton, VA 23681-2199, USA
Abstract
The results of an experimental and analytical study of the eects of initial imperfections on the buckling and
postbuckling response of three unstiened thin-pression-loaded graphite-epoxy cylindrical shells with
dierent orthotropic and quasi-isotropic shell-wall laminates are presented. The results identify the eects of traditional
and non-traditional initial imperfections on the non-linear response and buckling loads of the shells. The traditional
imperfections include the geometric shell-wall mid-surface imperfections that monly discussed in the literature
on thin shell buckling. The non-traditional imperfections include shell-wall thickness variations, local shell-wall
ply-gaps associated with the fabrication process, shell-end geometric imperfections, non-uniform applied end loads,
and variations in the boundary conditions including the eects of elastic boundary conditions. A high-ÿdelity non-linear
shell analysis procedure that accurately accounts for the eects of these traditional and non-traditional imperfections
on the non-linear responses and buckling loads of the shells is described. The analysis procedure includes a non-linear
static analysis that predicts stable response characteristics of the shells and a non-linear transient analysis that predicts
unstable response characteristics. Published by Elsevier Science Ltd.
1. Introduction
thin-walled buckling-resistant isotropic shell struc-
tures is to predict the buckling load of the shell with
The increasing need to produce lighter-weight
a deterministic analysis, and then to reduce this pre-
aerospace shell structures has led to the use of ad-
dicted load with an empirical “knockdown” factor
vanced material systems in n