The axial folding of metal tubes is known as an excellent energy-absorbing mechanism and component based on this principle are largely utilised in railway structures where energy, during a crash situation, needs to be absorbed in a controlled way. The absorption of energy is controlled by the plastic work in the crash box, which is given by the area below the force-displacement curve. The fold formation mechanism have been examined and some observation about the propagation of the stress waves along the column have been done in order to analyse the influence of the transient deformation process on the initiation of buckling for oblique impact. The reaction force-crash length curve, and the absorbed energy value, varying cross section, impact angle and impact velocity, have been calculated and the following results have been obtained, that the peak load increases with the velocity and with the thickness, while decreases with the impact angle, the energy absorption drops drastically when a global bending mode is initiated instead of an axial buckling, and it decreases further with increasing load angle. Also, the mean crash load can be classified into three parts: the first dominated by axial collapse, the second dominated by bending collapse and the last, in which a transition take place from axial to bending collapse.
Crash behaviour of square tubes subjected to oblique loads
2005
19 Seiten, 19 Bilder, 5 Tabellen, 10 Quellen
Conference paper
English
Crash behaviour of square tubes subjected to oblique load
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