Energy absorption of a nanoporous system subjected to dynamic loadings

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. (C) 2005 American Institute of Physics.