Elastic and plastic poisson’s ratios of nanoporous gold

We explore the elastic and plastic Poisson’s ratios, mE and mP, of nanoporous gold, using digital image correlation during compression experiments including load/unload segments. The two coefficients differ significantly, with mE independent of the ligament size, L, and with a trend for mP / L at not too large L. Disorder in the network of ligaments may explain why mE 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.

Subjects

nanoporous metal

mechanical properties

nanostructure

porous material

finite element analysis

DDC Class

620: Ingenieurwissenschaften

Funding(s)

SFB 986: Teilprojekt B2 - Feste und leichte Hybridwerkstoffe auf Basis nanoporöser Metalle

SFB 986: Teilprojekt B6 - Modellierung und Simulation der Interphaseneigenschaften von Kompositwerkstoffen aus Metall und Polymer auf der Nanoskala

Publication version

publishedVersion

Lizenz

https://creativecommons.org/licenses/by-nc-nd/4.0/

Name

1-s2.0-S1359646215003486-main.pdf

Size

693.45 KB

Format

Adobe PDF

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Elastic and plastic poisson’s ratios of nanoporous gold