Architectural choices for auxetic metamaterials and their effects on impact mitigation
bookPart
Negative Poisson’s ratio or auxetic materials have the potential to offer benefits for impact protection such as higher indentation resistance, fracture toughness and energy adsorption. In the quest for lighter materials providing impact protection these properties seem promising. Literature describes a wide range of possible architectures to achieve auxetic properties. However, the understanding of the influence of architectural choices at large deformations, such as configuration changes and stresses on mechanical performance, is still limited. Inertia-effects due to high strain rates pose an additional challenge in impact scenarios for the prediction of the protection performance in different material architectures. In a first step this research investigates the effects of different architectural choices in high strain rate scenarios with large deformations. In order to do so, the materials are numerically modeled as a lattice structure of geometrically exact (Simo-Reissner) beams. The effective properties of different configurations and their performance in impact scenarios are evaluated through numerical experiments. Finally, the relations between the effective properties and the performance in impact mitigation are shown.
TNO Identifier
992893
Source title
ECCOMAS Thematic Conference: Computational Modeling of Complex Materials across the Scales CMCS 2023
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