Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 42: Mechanical Properties I
MM 42.4: Vortrag
Mittwoch, 18. März 2015, 16:30–16:45, TC 010
Modeling nanoporous gold: on the influence of nodal shifting and ligament size distribution — •Bao-Nam D. Ngô1,2, Alexander Stukowski2, Jürgen Markmann1,3, Karsten Albe2, and Jörg Weissmüller1,3 — 1Institut für Werkstoffforschung, Werkstoffmechanik, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany — 2Technische Universität Darmstadt, Fachbereich Material- und Geowissenschaften, Fachgebiet Materialmodellierung, Darmstadt, Germany — 3Institut für Werkstoffphysik und Werkstofftechnologie, Technische Universität Hamburg-Harburg, Hamburg, Germany
We present a study of the influence of topology on mechanical behavior of nanoporous gold – a promising material for applications in actuation, catalysis and sensing, as well as a model candidate for study of plasticity at nanoscale. Using molecular dynamics, two topological descriptors were investigated: nodal shifting and ligament diameter distribution. For that purpose, we first studied a highly symmetric diamond-like structure – an idealized structure proposed recently by Finite Element Modeling. Then we gradually altered the topology of this symmetric structure in two different directions: randomly displacing its nodal positions and changing its ligament diameter distribution. Relevant mechanical properties investigated include macroscopic stress-strain behavior, deformation-induced structural changes, evolution of effective Young’s modulus, and evolution of defect densities. Our results show that both topological descriptors are important and strongly affect the mechanical properties of nanoporous gold.