Tests for&nbsp; dynamic compressive performance of closed-cell aluminum foams

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (5) : 1-6.

Tests for dynamic compressive performance of closed-cell aluminum foams

LI Zhongxian1,2,ZHANG Maoxuan1, SHI Yanchao1,2

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Abstract

To investigate the strain rate effect on dynamic compressive performance of closed-cell aluminum foam, the improved INSTRON High speed loading system was used to conduct dynamic compression tests of closed-cell aluminum foam specimens under different strain rate.Firstly, the forward and reverse test methods were adopted to study the dynamic compressive performance of closed-cell aluminum foam specimens with different thicknesses under the same loading velocity, and the specimen thickness to eliminate the inertia effect at a certain speed was obtained.A series of closed-cell aluminum foams were further tested under different loading rates to study the change law of their dynamic compression performances versus strain rate.The results showed that the dynamic stress-strain curve of closed-cell aluminum foam has three regions including an elastic region, a stress platform one and a compressive one, it is the same as that in the quasi-static case; platform stress of closed-cell aluminum foam has an obvious strain rate effect under high speed compressive loads, and its densification strain under different strain rates has different varying trends; this phenomenon is explained as the interaction effects between the change of plastic deformation mechanism of aluminum foam cell wall and fluctuations effect; the energy absorption capability of closed-cell aluminum foam is improved significantly with in crease in strain rate.

Key words

closed-cell aluminum foam / dynamic compression / inertia effect / strain rate effect / platform stress / densification strain / energy absorption capability

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LI Zhongxian1,2,ZHANG Maoxuan1, SHI Yanchao1,2. Tests for dynamic compressive performance of closed-cell aluminum foams[J]. Journal of Vibration and Shock, 2017, 36(5): 1-6

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