Abstract
Theoretical predictions of the collapse behaviour of thin rectangular aluminium plates are presented and discussed. The plates are simply supported around all four edges, and are subjected to uniaxial in-plane compression. The method of analysis developed by the author is described elsewhere. The material behaviour of aluminium is characterised by the Ramberg-Osgood stress-strain formula. Two methods of using this formula are discussed—one based on the usual percentage proof stress, and the other on the stress at which the plastic strain is a stated proportion of the elastic strain. It is shown why the latter method is more suited to the normalisation of results for collapse analyses. The results presented here give an indication of the effects on plate strength of plate slenderness, initial out-of-flatness, and n, the “knee” factor of the material stress-strain curve.
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