Quasi-static axial compression behavior of constraint hexagonal and square-packed empty and aluminum foam-filled aluminum multi-tubes

Abstract

The axial crushing behavior of empty and Al close-cell foam-filled single Al tubes and Al multi-tube designs (hexagonal and square) were investigated through quasi-static compression testing. The effects of foam filling on the deformation mode and the crushing and average crushing loads of single tubes and multi-tube designs were determined. The foam filling was found to shift the deformation mode of empty single tube and empty multi-tube designs from diamond into concertina. In multi-tube designs the constraint effects and the frictional forces were found to increase the average crushing loads over those of single tubes. It was also found that foam filling induced a higher strengthening coefficient in multi-tube than single tubes. Although foam filling increased the energy absorption in single tubes and multi-tube designs, it was not effective in increasing the specific absorbed energy over that of the empty tubes. However, multi-tube designs were found to be energetically more effective than single tubes at similar foam-filler densities, proving a higher interaction effect in multi-tube designs. r

Crushing and energy absorption characteristics of combined geometry shells at quasi-static and dynamic strain rates: Experimental and numerical study

“…The tubes with low D/t ratios (diameter/wallthickness) and rigidly perfectly plastic materials tend to exhibit axisymmetric mode (concertina) of deformation [2], while the tubes with high D/t ratios and strain hardening materials exhibit asymmetric mode (diamond) of deformation [3]. The effect of foam-filling and end-constraining on the crushing behavior of thinwalled tubes has been investigated widely, the examples of which include Santosa et al [4], Güden and Kavi [5] and Singace and ElSobky [3]. A coupled experimental and numerical study on the quasistatic crushing of tubes was performed by Taşdemirci [6].…”

Finite element and coupled finite element/smooth particle hydrodynamics modeling of the quasi-static crushing of empty and foam-filled single, bitubular and constraint hexagonal- and square-packed aluminum tubes

“…Closed-cell Al foam was used for the filling of single, bitubular and multi-tubes, while closed-cell polystyrene foam was used to fill the bitubular configurations. The present study is a continuation of the series of studies on the determination of the crushing behavior of empty and foam-filled circular single Al tubes [10] and multi-tube designs [11] and focuses specifically on the modeling of the empty and foam-filled tubes with bitubular and packed multi-tubes configurations.…”

Effects of Pre-Forming Process and PVC Foam Reinforcement on the Deformation Behavior of Aluminum Tube under Axial Loading

“…Decreasing damage in the course of a crash and precautions taken to control the deformation are essential to maximize the absorbed energy. Thin-walled tubes made of aluminum alloys of high specific strength have been widely investigated in literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] for determining their crush behavior under axial loading. These alloys are known to have relatively high specific strength and are therefore chosen for applications involving impact loading.…”