EXTREME shearography

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

Anisimov, A. (TU Delft Structural Integrity & Composites)
Groves, R.M. (TU Delft Structural Integrity & Composites)

Lehmann, Peter (editor)
Osten, Wolfgang (editor)
Goncalves, Armando Albertazzi (editor)

2019

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.

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

http://resolver.tudelft.nl/uuid:3ae51589-76ea-4b22-9fbf-2a003795da70

https://doi.org/10.1117/12.2525801

SPIE

2021-12-22

9781510627918

Optical Measurement Systems for Industrial Inspection XI, 11056

Optical Measurement Systems for Industrial Inspection XI 2019, 2019-06-24 → 2019-06-27, Munich, Germany

Proceedings of SPIE - The International Society for Optical Engineering, 0277-786X, 11056

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

conference paper

© 2019 A. Anisimov, R.M. Groves