Incus GmbH, Vienna, Austria, has partnered with the NanoProbe Group at Yale University to conduct collaborative research on auxetic structures. Led by Jacob Eldred, an undergraduate research assistant at Yale, and the NanoProbe Group, which is known for its work in materials characterisation and discovery, this collaboration aims to explore innovative designs and production methods for unique lattice structures.
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The lattice structures designed by Jacob Eldred aim to exhibit a negative Poisson’s ratio, causing the sample to become thinner when compressed or vice versa. This behaviour is attributed to the special design of the geometrical features, presenting challenges for conventional manufacturing processes.
The Hammer Lab35, Incus’ Additive Manufacturing machine, played a key role in bringing these intricate structures to life and assess the performance of both the structure and the material.
The sample’s exterior dimensions measure 9.3 x 9.3 x 10.2 mm, with a minimum lattice thickness of 150μm and a volume fill level of only 9%. The samples were manufactured without any support structures, and no post-processing was applied, such as machining, sand blasting, or chemical surface treatment.
The first measurements revealed a negative Poisson’s Ratio: ν = -0.59, @ ε = 6.1%, approximately twice the yield strain.
These auxetic structures have the potential for stress absorption and biomedical applications and can also function as multi-axial springs when produced in 3D forms.
This collaboration demonstrates the potential of merging technology with innovative research. Further opportunities in advanced materials and structures are anticipated.