|About this Abstract
||Materials Science & Technology 2019
||Synthesis, Characterization, Modeling and Applications of Functional Porous Materials
||A Modified Scaling Law for Stiffness of Nanoporous Materials Accounting for Deformation Mode Effects of Nodes and Ligaments
||Haomin Liu, Niaz Abdolrahim
|On-Site Speaker (Planned)
Gibson-Ashby model can’t well describe the stiffness of nanoporous (NP) materials as the ligament size decreases to the nanoscale. We theoretically developed a refined continuum model based on a cubic, periodic arrangement of a gyroid unit cell with three-fold node connectivity. Our modified scaling law is given as: E/E_s =C1 φ^2+C2φ, where C1 and C2 account for the bending and stretching deformation mode, respectively. We foud a good agreement between the simulation and theoretical predictions of the stiffness. We identified other morphological factors such as ligament aspect ratio and node to ligament volume ratio that affect the deformation behavior of NP materials more substantially than the relative density alone. A mixture of bending and stretching modes is observed in NP materials under tensile loading. We observed a bending-dominant to stretching dominant transition for nano-sized gyroid structures with varying relative density.
||Definite: At-meeting proceedings