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Effect of unstable crack growth on mode II interlaminar fracture toughness of a thermoplastic PEEK composite

Garcia Perez, Pablo and Bouvet, Christophe and Chettah, Ameur and Dau, Frédéric and Ballère, Ludovic and Peres, Patrick Effect of unstable crack growth on mode II interlaminar fracture toughness of a thermoplastic PEEK composite. (2019) Engineering Fracture Mechanics, 205. 486-497. ISSN 0013-7944

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Official URL: https://doi.org/10.1016/j.engfracmech.2018.11.022

Abstract

An end notched flexure (ENF) test was used to study the effect of growth stability on mode II interlaminar fracture toughness (GIIC) of a carbon/PEEK composite. The instability of the ENF test was used to induce both stable and unstable crack growth with a static loading. Two techniques were used to evaluate mode II fracture toughness: the traditional compliance method and the infra-red thermography technique. The compliance technique has the advantage of being simple and it has already been confirmed for standard tests. Nevertheless its results may be inaccurate for unstable crack growth propagation. The infra-red thermography technique enables fracture toughness to be accurately measured for non-standard tests in which the crack growth may be unstable. Both methods are complementary and this study came to the conclusion that GIIC is sensitive to crack growth velocity. Fracture toughness showed a low value for crack growth start and unstable propagation, and a high value for stable crack growth. The transition between a ductile fracture mode (for low crack growth velocity) and a brittle fracture mode (for high crack growth velocity) explained the important variability in GIIC values.

Item Type:Article
HAL Id:hal-02009423
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Institut Polytechnique de Bordeaux - IPB (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > ArianeGroup (FRANCE)
Other partners > Université de Bordeaux (FRANCE)
Other partners > Université Bourgogne Franche-Comté - UBFC (FRANCE)
Laboratory name:
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Deposited By: christophe bouvet
Deposited On:31 Jan 2019 15:45

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