Dynamic densification behavior of nanoiron powders under shock compression
File(s)
Published version
Author(s)
Dai, C
Eakins, D
Thadhani, N
Type
Journal Article
Abstract
The dynamic densification behavior of nanoiron powder (∼25nm particle size) prepressed to ∼35% and ∼45% of solid density was determined based on measurements of shock input stress and wavevelocity by using piezoelectric stress gauges. The experimentally determined shock densification response is observed to be sensitive to the initial density (or porosity) of prepressed nanoiron powder compacts. Hugoniot measurements show an obvious densification-distension transition at ∼2GPa for the ∼35% dense and ∼6GPa for the ∼45% dense powder compacts. The densification and shock compression responses of the nanoiron powders are also calculated by using isobaric and isochoric models. Correlations of the model calculations with the measured data indicate that the shock Hugoniot of nanoiron powders cannot be correctly described by the currently available analytical models that are otherwise capable of predicting the Hugoniot of highly porous materials (prepressed compacts) of micron-sized powders.
Date Issued
2008-05-02
Date Acceptance
2008-02-19
Citation
Journal of Applied Physics, 2008, 103
ISSN
1089-7550
Publisher
American Institute of Physics (AIP)
Journal / Book Title
Journal of Applied Physics
Volume
103
Copyright Statement
Copyright © 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in 'Dynamic densification behavior of nanoiron powders under shock compression' C. D. Dai, D. E. Eakins and N. N. Thadhani, J. Appl. Phys. 103, 093503 and may be found at https://dx.doi.org/10.1063/1.2908209
Publication Status
Published
Article Number
093503