Abstract
The energy absorption of different cell structures for closed-cell aluminum foam-filled Al tubes are investigated through quasi-static compression testing. Aluminum foams are fabricated under different pressures, obtaining aluminum foams with different cell sizes. It is found that the deformation of the foam core is close to the overall deformation, and the deformation band is seriously expanded when the cell size is fined, which leads to the increase of interaction. Results confirm that the foam-filled tubes absorb more energy due to the increase of interaction between the foam core and tube wall when the foaming pressure increases. The energy absorption efficiency of foam-filled tubes can reach a maximum value of 90% when the foam core is fabricated under 0.30 MPa, which demonstrates that aluminum foams fabricated under increased pressure give a new way for the applications of foam-filled tubes in the automotive industry.
Highlights
Thin-walled metallic tubes have been widely used as energy absorbing devices as a result of their progressive buckling during structural impact and the light weight of the structure [1,2,3]
The present study investigates the energy absorption of different cell structures for closed-cell
The present study investigates the energy absorption of different cell structures for closed-cell aluminum foam-filled Al tubes through compression testing
Summary
Thin-walled metallic tubes have been widely used as energy absorbing devices as a result of their progressive buckling during structural impact and the light weight of the structure [1,2,3]. Niknejad et al pointed out that the effect of low density polyurethane foam (0.05 g/cm3 ) on the crushing strength of tubes is negligible, suggesting that high density polyurethane foam has an effect on the compression behavior and enhances the energy absorption of tubes [15]. To further understand the effect of the foam core on the interaction and the energy absorption of foam-filled tubes, here, different cell sizes of aluminum foams (ranges from 3 to 0.8 mm) are fabricated under different pressures [17], the density range of which is from 0.40 g/cm to 0.90 g/cm , which is much greater than the foam materials mentioned above. The energy absorption efficiency of foam-filled tubes can be predicted by the criterion related to the strength of the tubes and foams
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