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

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