Elastic and plastic Poisson's ratios of nanoporous gold. (1st January 2016)

• Record Type: Journal Article
• Authors: Lührs, Lukas; Soyarslan, Celal; Markmann, Jürgen; Bargmann, Swantje; Weissmüller, Jörg
• Is Part Of: Scripta materialia. Volume 110(2016)
• Page Start: 65
• Page End: 69
• Publication Date: 2016-01-01
• Subjects: Nanoporous metal -- Mechanical properties -- Nanostructure -- Porous material -- Finite element analysis; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.08.002
• Languages: English
• ISSNs: 1359-6462

Abstract

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