Auxetic honeycombs

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This is the latest paper on the characterization of auxtic honeycomb structures within the framework of the GRK 2495. In this paper we demonstrate as a new concept the determination of the mechanical strength of opaque ceramic structures by the use of non-destructive, stress-optical measurements on identical transparent structures together with collegues from Faculté Sciences & Techniques and Nagoya institute of Technology.

The paper is published open-source in Materials MDPI and accessible at

Figure 1. (a) Auxetic and (b) hexagonal unit cell with symmetry axes (X/Y) and structural parameters:
strut thickness t, width h, angle θ, leg length l, and measuring points A−F for photoelastic stress
measurement, (c) alumina unit cells with varying angle θ between θ = −35°and 35°.