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MM: Fachverband Metall- und Materialphysik
MM 23: Mechanical Properties II
MM 23.5: Vortrag
Dienstag, 8. März 2016, 12:45–13:00, H52
How ligament connectivity determines stiffness of nanoporous gold? — •Bao-Nam Ngô1,2, Benedikt Roschning3, 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 deformation-induced changes of ligament connectivity and its influence on the elasticity of nanoporous gold - a promising material for applications in actuation, catalysis and sensing, as well as a model candidate for study of mechanics at the nanoscale. Using molecular dynamics, a computer sample created by spinodal decompostion was uni-axially deformed in a load/unload sequence. A surface reconstruction algorithm was employed to provide necessary information for calculating genus density and its changes during the plastic deformation. The results were then cast against corresponding changes of the elastic modulus. We also performed Finite Element Analysis on some deformed structures, using the reconstructed surfaces as initial structures in order to get a reference which is not influenced by size and interface effects. While our study reveals a strong influence of the ligament connectivity on the elastic behavior of nanoporous gold, other factors must be taken into account to explain its exceedingly compliant behavior.