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Mixed-mode delamination growth in carbon-fibre composite laminates under cyclic loading

Delamination growth under fatigue loads in real composite components generally develops in a non-constant propagation mode. The aim of the investigation described in this article was to develop a model capable of predicting the fatigue delamination growth in a general case, under varying mode mix conditions. The crack growth development in essentially unidirectional laminates of carbon-fibre reinforced epoxy was analysed in terms of the Paris law for different constant propagation modes: mode I (double-cantilever beam test), mode II (end-notched flexure test) and different mixed-modes I/II (mixed-mode bending test). The dependence of the Paris law parameters on mode mix is compared with the existing models in the literature. It is shown that these models do not reproduce the non-monotonic dependence on mode mix which has been observed in experimental data. Therefore, an improved phenomenological model is introduced and compared with the experimental data obtained by other researchers. To check the ability of the model to predict variable mixed-mode fatigue delamination, the mixed-mode end-loaded split test was employed and the experimental results were compared to the predictions of the model. The underlying mechanisms responsible for the dependency of the crack propagation rates on the degree of mode mix are also discussed on the basis of fractographic analysis

The authors would like to show their appreciation financial support from the Spanish Government (MAT2000-0741-C02-01), the Swedish Research Council (VR) and the Swedish Defence Materiel Administration (FMV)

¬© International Journal of Solids and Structures, 2004, vol. 41, n√ļ,. 15, p. 4219-4235

Elsevier

Author: Blanco Villaverde, Norbert
Gamstedt, E.K.
Asp, L.E.
Costa i Balanzat, Josep
Date: 2004
Abstract: Delamination growth under fatigue loads in real composite components generally develops in a non-constant propagation mode. The aim of the investigation described in this article was to develop a model capable of predicting the fatigue delamination growth in a general case, under varying mode mix conditions. The crack growth development in essentially unidirectional laminates of carbon-fibre reinforced epoxy was analysed in terms of the Paris law for different constant propagation modes: mode I (double-cantilever beam test), mode II (end-notched flexure test) and different mixed-modes I/II (mixed-mode bending test). The dependence of the Paris law parameters on mode mix is compared with the existing models in the literature. It is shown that these models do not reproduce the non-monotonic dependence on mode mix which has been observed in experimental data. Therefore, an improved phenomenological model is introduced and compared with the experimental data obtained by other researchers. To check the ability of the model to predict variable mixed-mode fatigue delamination, the mixed-mode end-loaded split test was employed and the experimental results were compared to the predictions of the model. The underlying mechanisms responsible for the dependency of the crack propagation rates on the degree of mode mix are also discussed on the basis of fractographic analysis
The authors would like to show their appreciation financial support from the Spanish Government (MAT2000-0741-C02-01), the Swedish Research Council (VR) and the Swedish Defence Materiel Administration (FMV)
Format: application/pdf
ISSN: 0020-7683
Document access: http://hdl.handle.net/10256/11580
Language: eng
Publisher: Elsevier
Collection: CICYT/PN 2000-2003/MAT2000-0741-C02-01
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.ijsolstr.2004.02.040
Articles publicats (D-EMCI)
Is part of: ¬© International Journal of Solids and Structures, 2004, vol. 41, n√ļ,. 15, p. 4219-4235
Rights: Tots els drets reservats
Subject: Carboni -- Compostos
Carbon compounds
Carboni -- Compostos -- Fatiga
Carbon compounds -- Fatigue
Title: Mixed-mode delamination growth in carbon-fibre composite laminates under cyclic loading
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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