Elastic and plastic Poisson’s ratios of nanoporous gold


We explore the elastic and plastic Poisson’s ratios, νEνE and νPνP, of nanoporous gold, using digital image correlation during compression experiments including load/unload segments. The two coefficients differ significantly, with νEνE independent of the ligament size, L , and with a trend for View the MathML sourceνP∝L at not too large L . Disorder in the network of ligaments may explain why νEνE is smaller than predicted by lattice-based models. Finite element simulations, based on the Deshpande–Fleck constitutive law, validate the data analysis. The constitutive law captures work-hardening and transverse flow of nanoporous gold in good agreement with the experiment.
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