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Abstract
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimIn this article, we present an experimental study validating the concept of the reinforced-core auxetic assemblies. The main distinctive feature of these assemblies is the presence of a reinforcing core in the microstructural units that increases the shear stiffness and thus produces negative Poisson's ratio. We tested a number of prototypes manufactured using the stereolithography and selective laser sintering methods. To measure the deformations, we employed the close-range photogrammetry method, which enables monitoring of locations of unlimited number of points from digital images. We developed a procedure for multi-point measurement of planar deformations using a single digital camera. This procedure allows for continuous measurement of deformations without interruption to the loading sequence. Camera self-calibration is based on multiple images of stable reference points, which enables high accuracy of the measurements even using a consumer grade digital camera. We compare the obtained experimental results with a simplified continuum model. We demonstrate a good agreement between the theoretical predictions and the experimental results.
Original language | English |
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Pages (from-to) | 1342-1358 |
Journal | Physica Status Solidi (B) Basic Research |
Volume | 253 |
Issue number | 7 |
Early online date | 15 Jun 2016 |
DOIs | |
Publication status | Published - Jul 2016 |
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