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Mechanical and laser impact effects on woven composites with hemp or glass fibres

Fabienne Touchard (Institut Pprime, Université de Poitiers, Poitiers, France)
Michel Boustie (Institut Pprime, Université de Poitiers, Poitiers, France)
Laurence Chocinski-Arnault (Institut Pprime, Université de Poitiers, Poitiers, France)
Pedro Pascual González (Institut Pprime, Université de Poitiers, Poitiers, France)
Laurent Berthe (PIMM, Arts et Metiers ParisTech, Paris, France)
Davi de Vasconcellos (Institute for Polymers, Composites and Biomaterials, NRC Portici, Italy)
Luigi Sorrentino (Institute for Polymers, Composites and Biomaterials, NRC Portici, Italy)
Pawel Malinowski (Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Gdansk, Poland)
Wieslaw Ostachowicz (Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Gdansk, Poland) (Faculty of Automotive and Construction Machinery, Warsaw University of Technology, Warsaw, Poland)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 12 June 2017

Abstract

Purpose

The purpose of this paper is to study the damage induced in “green” and synthetic composites under impact loading.

Design/methodology/approach

The study was focussed on epoxy-based composites reinforced with woven hemp or glass fibres. Six assessment techniques were employed in order to analyse and compare impact damages: eye observation, back face relief, terahertz spectroscopy, laser vibrometry, x-ray micro-tomography and microscopic observations.

Findings

Different damage detection thresholds for each material and technique were obtained. Damage induced by mechanical and laser impacts showed relevant differences, but the damage mechanisms are similar in both types of impact: matrix cracks, fibre failure, debonding at the fibres/matrix interface and delamination. Damage shape on back surfaces is similar after mechanical or laser impacts, but differences were detected inside samples.

Originality/value

The combination of these six diagnoses provides complementary information on the damage induced by mechanical or laser impacts in the studied green and synthetic composites.

Keywords

Acknowledgements

This study was realised thanks to a French-Polish-Italian collaboration in the frame of the project “Eco-Composites: damage Analysis Using Laser shock Technology” (PICS “ECAULT”– No. 6,366).

Citation

Touchard, F., Boustie, M., Chocinski-Arnault, L., Pascual González, P., Berthe, L., de Vasconcellos, D., Sorrentino, L., Malinowski, P. and Ostachowicz, W. (2017), "Mechanical and laser impact effects on woven composites with hemp or glass fibres", International Journal of Structural Integrity, Vol. 8 No. 3, pp. 286-307. https://doi.org/10.1108/IJSI-06-2016-0022

Publisher

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Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited