Jd. Allen et al., LIMIT ANALYSIS OF PLATES AND ISOPERIMETRIC-INEQUALITIES, Philosophical transactions-Royal Society of London. Physical sciences and engineering, 347(1682), 1994, pp. 113-137
A general isoperimetric inequality for the collapse loads of uniformly
loaded, edge supported rigid-plastic plates of arbitrary shape is est
ablished. The inequality provides a lower bound to this load and invol
ves just the length of the perimeter and the area of the collapsing re
gion of the plate. This paper establishes a proof, under certain restr
ictions, of this inequality which to-date has been just a conjecture.