Postbuckling failure of carbon-epoxy compression panels

摘要

The post-buckled failure of carbon/epoxy compression panels is studied experimentally and theoretically. Four different designs are considered each of which has significant post-buckled strength with a failure load more than twice the bucklingload. The mechanisms which can initiate failure through stiffener debonding, prior to imminent explosive collapse, are postulated, taking account of the buckled mode shape. The specific mechanism which leads to failure in each of the particular fourdesigns is identified from careful experiments with complete panels and also by suitably loading transverse strips cut from the panel to be tested. These component tests provide a quantitative guide to the magnitude of a stress resultant which will leadto de-bond initiation. This stress resultant can then be related to a compression failure load through an FE analysis of the post-buckled panel.