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A generic experimental study on the transition from progressive buckling to global bending during axial crushing of long square tubes was carried out. The tubes were made of the aluminium alloy 6060 T6 with 2.5 mm thickness and 80 mm outer width. Impact tests on tubes having free lengths of 1300, 1600 and 1900 mm were carried out in a pendulum accelerator. The tubes were fixed at the distal end to...