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Inextensional collapse modes are presented for the axial compression of thin-walled tubes. Shortening is achieved by folding about fiied hinge lines to form a number of flat triangular planes. A new mechanism is propounded by which collapse proceeds progressively from one end of the tube, following the passage of a travelling hinge. Simple expressions are developed for mean collapse load and the energy absorbed during collapse of rigidperfectly plastic tubes.Comparison of collapse modes and predicted loads with those obtained from experiments on rigid P.V.C. tubes of various thickness, diameter and length give encouraging agreement.

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