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Impact damage assessment in biocomposites by micro-CT and innovative air-coupled detection of laser-generated ultrasound

The increasing use of natural fibre composites in at least semi-structural applications along with a demand for a fast and accurate damage detection for quality purpose and in-service reliability promote a need for non-contact non-destructive testing techniques. To this purpose, ultrasound is probably one of the most widely used testing techniques but the need of a coupling fluid like water limits its use with natural fibre composites. In this work, a novel non-contact set-up based on laser excitation of ultrasound and detection with a broadband, air-coupled optical microphone is presented and tested on flax/PLA laminates. This material system has been characterized in terms of quasi-static mechanical properties and low velocity impact response. The outcomes of this study demonstrate the potential of this non-contact and nondestructive system for quality and damage inspection purposes of natural fibre composites.

» Author: Balthasar Fischer, Fabrizio Sarasini, Jacopo Tirillň, Fabienne Touchard, Laurence Chocinski-Arnault, David Mellier, Nils Panzer, Ryan Sommerhuber, Pietro Russo, Ilaria Papa, Valentina Lopresto, Romain Ecault

» Reference: 10.1016/j.compstruct.2018.12.013

» Publication Date: 15/02/2019

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [609203].

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