Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10628211 | Composites Part A: Applied Science and Manufacturing | 2005 | 13 Pages |
Abstract
This paper describes the fractographic analysis of five CFRP post-buckled skin/stringer panels that were tested to failure in compression. The detailed damage mechanisms for skin/stiffener detachment in an undamaged panel were characterised and related to the stress conditions during post-buckling; in particular the sites of peak twist (at buckling nodes) and peak bending moments (at buckling anti-nodes). The initial event was intralaminar splitting of the +45° plies adjacent to the skin/stiffener interface, induced by high twist at a nodeline. This was followed by mode II delamination, parallel to ±45° plies and then lengthwise (0°) shear along the stiffener centreline. The presence of defects or damage was found to influence this failure process, leading to a reduction in strength. This research provides an insight into the processes that control post-buckled performance of stiffened panels and suggests that 2D models and element tests do not capture the true physics of skin/stiffener detachment: a full 3D approach is required.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Charlotte Meeks, Emile Greenhalgh, Brian G. Falzon,