We propose a simple strain gradient plasticity model that predicts the very high strengths reported for ligaments in nanoporous gold. This is shown to predict that the yield strength of gold scales inversely with ligament diameter to the power -0.5 with yield stress levels consistent with literature values. The model assumes the predominant deformation mechanism to be the bending of ligaments within the structure of the nanoporous foam, as assumed by the model of Gibson and Ashby [1,2]. The validity of this assumption will be explored to further develop a model for the deformation of nanoporous metals that includes both the effect of a strain gradient and any intrinsic size effect.

1) L.J. Gibson and M.F.Ashby, Proc. Royal. Soc. Lon. A382 (1982) 43.

2) L.J. Gibson and M.F.Ashby, Cellular Solids: Structure and Properties, second edition, Cambridge University Press, Cambridge, UK, 1997.

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