Are Auxetics Better for Protection?
On the Behaviour of Architected Metamaterials under High-Rate Loading Conditions
T. Gärtner (TU Delft - Applied Mechanics)
L.J. Sluijs – Promotor (TU Delft - Applied Mechanics)
J. Weerheijm – Copromotor (TU Delft - Applied Mechanics)
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Abstract
Auxetic materials, recognised for their unusual ability to expand when stretched, are often claimed to provide superior impact protection. But do they really outperform conventional designs?
This dissertation critically examines that claim through detailed numerical simulations and high-speed impact experiments. By comparing auxetic metamaterials with standard honeycomb structures, the author reveals that most auxetic designs absorb less energy and transmit more force upon impact.
These findings challenge a widely held assumption and provide a new perspective on designing materials for protection and performance.
The research conducted for this dissertation was carried out in collaboration with TNO under the supervision of Sanne J. van den Boom.