Abstract
The phenomenon of secondary instabilities in stiffened composite panels, loaded in uniaxial compression, is studied through a number of experimental investigations. This behaviour is shown to manifest itself as a ‘mode-jump’ - a sudden change in the out-of-plane deformation of a buckled panel. Use of high-speed digital speckle photogrammetry is made to gain further insight into an I-stiffened panel’s response during the transient phase associated with mode-jumping. At high loading, this sudden dissipation of energy will be shown to be able to cause failure in vulnerable structures. Predicting this structural response reliably, using the finite element method, poses considerable numerical challenges and the shortcomings of current non-linear solution schemes are discussed. A robust and efficient strategy, which utilizes an automated quasi-static/pseudo-transient hybrid scheme, is presented and validated using a number of experimental tests. This approach is shown to be able to predict mode-jumping with good accuracy. © 2008 by Imperial College Press.
| Original language | English |
|---|---|
| Title of host publication | Buckling And Postbuckling Structures: Experimental, Analytical And Numerical Studies |
| Editors | Brian G Falzon, MH Ferri Aliabadi |
| Publisher | World Scientific Publishing Co. |
| Pages | 65-98 |
| Number of pages | 34 |
| ISBN (Print) | 978-184816230-3 (ISBN) 2044-9283 |
| DOIs | |
| Publication status | Published - 2008 |