Deformation analysis of reinforced-core auxetic assemblies by close-range photogrammetry

Research output: Contribution to journalArticle

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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 languageEnglish
Pages (from-to)1342-1358
JournalPhysica Status Solidi (B) Basic Research
Volume253
Issue number7
Early online date15 Jun 2016
DOIs
Publication statusPublished - Jul 2016

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photogrammetry
Photogrammetry
assemblies
digital cameras
Digital cameras
Stereolithography
interruption
Poisson ratio
grade
stiffness
sintering
Sintering
lithography
Cameras
cameras
prototypes
Stiffness
Calibration
shear
continuums

Cite this

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abstract = "{\circledC} 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.",
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Deformation analysis of reinforced-core auxetic assemblies by close-range photogrammetry. / Shufrin, Igor; Pasternak, Elena; Dyskin, Arcady.

In: Physica Status Solidi (B) Basic Research, Vol. 253, No. 7, 07.2016, p. 1342-1358.

Research output: Contribution to journalArticle

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AB - © 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.

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