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Thin-walled straight circular tubes (SCT) are frequently used as energyabsorbing devices in the crashworthy applications. This paper introduces avarious tubal configuration, namely aluminium foam filled corrugation tube andtapered tube with graded thickness, to control the collapse mode, and minimizethe peak crushing force and fluctuations in force-displacement curves. Dynamiccrushing simulations were carried out using commercially available finiteelement package ABAQUS explicit 6.13 at impact velocity of 60 km/h(corresponding to 16.7 m/s). A comparative study on the dynamic crushingbehaviour of aluminum foam-filled tapered with graded thickness and corrugatedtubes were performed. The results showed that deformation mode of corrugatedtube is more controllable and predictable in the case of empty tubes. In foamfilled tubes the mode of deformation changing from diamond or mixed mode toconcertina mode which is useful for crashworthy applications. The crushingforce efficiency of foam filled tubes increases when compared with the emptytubes because of a higher mean force which can be achieved by less fluctuationsin force-displacement curves. The effects of corrugation wavelength andamplitude of corrugation tubes on the collapse mode, peak crushing force andenergy absorption were studied. Compared to the conventional straight circulartube, initial peak force and fluctuation in the force-displacement curves ofcorrugated tube is considerably less. Desired crashworthy characteristics canbe obtained by changing corrugation wavelength and amplitude of corrugatedtubes.

Compression behaviour and crashworthiness analysis of aluminum foam filled corrugated and tapered tubes with graded thickness