Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 19: Mechanical Properties I
MM 19.4: Vortrag
Dienstag, 8. März 2016, 11:00–11:15, H52
Scaling laws of nanoporous gold under uniaxial compression: Effects of structural disorder on the solid fraction, elastic Poisson's ratio, Young's modulus and yield strength — •Benedikt Roschning1 and Norbert Huber1,2 — 1Institute of Materials Physics and Technology, Hamburg University of Technology — 2Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht
Recent investigations on the mechanical behavior of nanoporous gold [1,2,3] led to inconsistencies to previous results (summarized in [4]) indicating that the material's coupling behavior between the solid phase and the macroscopic mechanical response is still not fully clarified. We investigated the relationship between the structural disorder and the macroscopic mechanical behavior of nanoporous gold under uniaxial compression, using the finite element method. Scaling equations for the elastic Poisson's ratio, the Young's modulus and the yield strength were determined as functions of the structural disorder and the solid fraction. The model was applied to identify the elastic-plastic material behavior of the solid gold phase. Based on this approach, a systematic study of the size effect on the yield strength was performed and the results were compared to experimental data provided in literature. An excellent agreement with recently published results for samples of nanoporous gold with varying ligament size was found. [1] Huber, N., et al. 2014. Acta Materialia 67, 252-265. [2] Jin, H.-J., et al., 2009. Acta Materialia 57, 2665-2672. [3] Wang, K., et al., 2015. NPG Asia Mater 7, e187. [4] Weissmüller J., et al., 2009. MRS Bulletin 34, 577-586.