In a previous study [X. Kong and Y. Qiao, Appl. Phys. Lett. 86, 151919 (2005)], we analyzed the energy absorption behaviors of a nanoporous system subjected to quasi-static loadings. In this work, the performance of similar systems under dynamic loadings is investigated through a Hopkinson bar experiment. The energy absorption efficiency increases significantly with the loading rate, which is attributed to the effect of internal friction.
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Surani et al. (2005) studied this question.
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