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

Igor Shufrin, Elena Pasternak, Arcady V. Dyskin

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

In 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
Number of pages17
JournalPhysica Status Solidi (B): Basic Research
Volume253
Issue number7
DOIs
StatePublished - 1 Jul 2016
Externally publishedYes

Keywords

  • auxetics
  • close-range photogrammetry
  • rapid prototyping
  • reinforced-core units

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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