|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Design for Mechanical Behavior of Architectured Materials via Topology Optimization
||Discrete-element Modeling of Nacre-like Materials: Random Microstructures, Nonlinear Deformations and Fracture
||Najmul Abid, Mohammad Mirkhalaf, Francois Barthelat
|On-Site Speaker (Planned)
Natural materials such as nacre, collagen, and spider silk are composed of staggered stiff and strong inclusions in a softer matrix, a specific type of hybrid microstructure which generates remarkable combinations of stiffness, strength, and toughness. Here we use discrete element modeling (DEM) to capture the response of large statistical volume elements (SVEs) of staggered composites which incorporate statistical variations. We find that even small statistical perturbations precipitate strain localization and decrease ductility by a large fraction, while these negative effects can be offset by strain hardening and large strain at the interfaces. We also present DEM fracture models with >60,000 inclusions that capture crack deflection, crack bridging, inelastic process zone and residual deformations in the wake of the crack. The fracture of staggered composite is strongly affected by the arrangement of the inclusions and statistical variations. These findings suggest new design guidelines for bio-inspired composites with superior performance.
||Planned: Supplemental Proceedings volume