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

Mechanical and laser impact effects on woven composites with hemp or glass fibres PurposeThe purpose of this paper is to study the damage induced in “green” and synthetic composites under impact loading.Design/methodology/approachThe 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.FindingsDifferent 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/valueThe combination of these six diagnoses provides complementary information on the damage induced by mechanical or laser impacts in the studied green and synthetic composites. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Structural Integrity Emerald Publishing

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

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References (31)

Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
1757-9864
DOI
10.1108/IJSI-06-2016-0022
Publisher site
See Article on Publisher Site

Abstract

PurposeThe purpose of this paper is to study the damage induced in “green” and synthetic composites under impact loading.Design/methodology/approachThe 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.FindingsDifferent 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/valueThe combination of these six diagnoses provides complementary information on the damage induced by mechanical or laser impacts in the studied green and synthetic composites.

Journal

International Journal of Structural Integrity – Emerald Publishing

Published: Jun 12, 2017

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