Elastic and plastic Poisson's ratios of nanoporous gold

SCRIPTA MATERIALIA

卷:110

Article

Luehrs, Lukas¹  Soyarslan, Celal²  Markmann, Juergen^1,3  Bargmann, Swantje^2,3  Weissmueller, Joeg^1,3 

[1] Hamburg Univ Technol, Inst Mat Phys & Technol, Hamburg, Germany

[2] Hamburg Univ Technol, Inst Continuum Mech & Mat Mech, Hamburg, Germany

[3] Helmholtz Zentrum Geesthacht, Inst Mat Res, Mat Mech, D-21502 Geesthacht, Germany

关键词: Nanoporous metal;    Mechanical properties;    Nanostructure;    Porous material;    Finite element analysis;   

DOI  :  10.1016/j.scriptamat.2015.08.002

来源: Elsevier

【 摘 要 】

We explore the elastic and plastic Poisson's ratios, nu(E) and nu(P), of nanoporous gold, using digital image correlation during compression experiments including load/unload segments. The two coefficients differ significantly, with nu(E) independent of the ligament size, L, and with a trend for nu(P) proportional to L at not too large L. Disorder in the network of ligaments may explain why nu(E) 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. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd.

【 授权许可】

Free