EXTREME shearography: High-speed shearography instrument for in-plane surface strain measurements during an impact event

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2 Citations (Scopus)

Abstract

This work presents the design and the latest experimental results on the surface strain measurements during an impact event obtained with the EXTREME high-speed shearography instrument. The shearography technique is used in this project to provide a quantitative measurement of the surface strain development at the first moments of the impact event (μs time scale) which may reveal the initiation of the failure mechanisms in composite materials. Experimentally measured surface strain components over the field of view will be used as input and validation data for new numerical and analytical models of the impact response of composites. The new configuration of the shearography instrument realises measurements of the in- and out-of-plane surface strain components to improve coupling with the numerical models. Two viewing directions (shearing interferometers) with a double-frame approach are used to capture the interferograms during the impact. The interferometers realise a double-imaging Mach-Zehnder scheme for the spatial phase-shifting with independent control of the shearing amount and the carrier frequency. The set of technical parameters of the developed shearography instrument makes it one of the most extreme applications of shearography for material characterisation. The framework for this work is the "EXTREME Dynamic Loading - Pushing the Boundaries of Aerospace Composite Material Structures" Horizon 2020 project.

Original languageEnglish
Title of host publicationOptical Measurement Systems for Industrial Inspection XI
EditorsPeter Lehmann, Wolfgang Osten, Armando Albertazzi Goncalves
PublisherSPIE
Number of pages8
Volume11056
ISBN (Electronic)9781510627918
DOIs
Publication statusPublished - 2019
EventOptical Measurement Systems for Industrial Inspection XI 2019 - Munich, Germany
Duration: 24 Jun 201927 Jun 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11056
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceOptical Measurement Systems for Industrial Inspection XI 2019
CountryGermany
CityMunich
Period24/06/1927/06/19

Keywords

  • Composite materials
  • Double-pulse shearography
  • Flexural waves
  • High-speed shearography
  • Impact
  • Surface strain
  • surface strain
  • double-pulse shearography
  • impact
  • flexural waves
  • high-speed shearography
  • composite materials

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