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Proceedings Paper

Assessment of damage in 'green' composites
Author(s): Paweł H. Malinowski; Wiesław M. Ostachowicz; Fabienne Touchard; Michel Boustie; Laurence Chocinski-Arnault; Pedro Pascual Gonzalez; Laurent Berthe; Davi de Vasconcellos; Luigi Sorrentino
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Paper Abstract

The behaviour of eco-composites, when subjected to laser or mechanical impact loadings, is not well known yet. A research was proposed looking at the behaviour of ‘green’ and synthetic composites under impact loading. The study was focused on composites reinforced with short, medium and long fibres. Short fibre composites were made of spruce fibres and ABS. The fibres were used both as received and after a thermal treatment. Another set of samples was made of 60 mm-long flax fibres. Two types of thermoplastic polymers were used as matrices: polypropylene and polylactide. Also a woven eco-composite was investigated. It was made of plain woven hemp fabric impregnated with epoxy resin. A fully synthetic woven composite, used as reference laminate for comparison with ‘green’ composites, was prepared by using a plain weave woven glass fabric impregnated with epoxy resin. Mechanical impacts were performed by means of a falling dart impact testing machine. The specimens were tested at different impact energy levels (from 1J to 5J) by keeping constant the mass of the impactor and varying the drop height. Laser impact tests were performed by means of a high power laser shock facility. All the samples were tested at six different laser shock intensities, keeping constant the shock diameter and the pulse duration. 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. Different damage detection thresholds for each material and technique were obtained.

Paper Details

Date Published: 5 April 2017
PDF: 12 pages
Proc. SPIE 10170, Health Monitoring of Structural and Biological Systems 2017, 1017008 (5 April 2017); doi: 10.1117/12.2258586
Show Author Affiliations
Paweł H. Malinowski, Institute of Fluid-Flow Machinery (Poland)
Wiesław M. Ostachowicz, Institute of Fluid-Flow Machinery (Poland)
Warsaw Univ. of Technology (Poland)
Fabienne Touchard, Institut PPRIME, CNRS, ISAE-ENSMA, Univ. de Poitiers (France)
Michel Boustie, Institut PPRIME, CNRS, ISAE-ENSMA, Univ. de Poitiers (France)
Laurence Chocinski-Arnault, Institut PPRIME, CNRS, ISAE-ENSMA, Univ. de Poitiers (France)
Pedro Pascual Gonzalez, Institut PPRIME, CNRS, ISAE-ENSMA, Univ. de Poitiers (France)
Laurent Berthe, PIMM, CNRS, ENSAM ParisTech (France)
Davi de Vasconcellos, Institute for Polymers, Composites and Biomaterials, CNR (Italy)
Luigi Sorrentino, Institute for Polymers, Composites and Biomaterials, CNR (Italy)


Published in SPIE Proceedings Vol. 10170:
Health Monitoring of Structural and Biological Systems 2017
Tribikram Kundu, Editor(s)

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