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Étude expérimentale et numérique de la fissuration intralaminaire et de l'initiation du délaminage de bord libre dans les structures stratifiées pseudo-tissées

Abstract : Glass / Epoxy laminated structures made with pseudo woven prepregs are studied. In this kind of materials, delamination and intralaminar damages are usually observed. The study is divived in five main parts. First, intralaminar fissuration's characteristics are experimentaly investigated. Many of this characteritics are very like the ones usually observed in non woven laminated composites. Still, the studied material's pseudo woven structure have great influence on this damage, particularly for the damages' kinetic evolution and its thickness effect. A second testing program was conducted to investigate on structures' free egdes delamination initiation. To able to detecte and observe the differents damages developping on specimen's free edges, an innovative optic method was established. A dye and a suitable lighting are used for this method. We have been able to study both effects of intralaminar damages and the material's pseudo woven structure on delamination beginning. In addition, intralaminar damages have been modeled and a delamination initiation criterion have been established. Moreover, intralaminar damages modeling could take into account incomplete closing cracks effects. Delamination criterion is a stress criterion. It's built with the delaminating interface's stress vector of whom components are averaged on a characteristic distance. At last, the model and the criterion were validated on both non holed and holed specimens.
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https://pastel.archives-ouvertes.fr/pastel-00003369
Contributor : Ecole Mines Paristech <>
Submitted on : Thursday, April 10, 2008 - 8:00:00 AM
Last modification on : Thursday, April 9, 2020 - 5:08:04 PM
Document(s) archivé(s) le : Wednesday, September 8, 2010 - 6:02:31 PM

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  • HAL Id : pastel-00003369, version 1

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Yann Duplessis Kergomard. Étude expérimentale et numérique de la fissuration intralaminaire et de l'initiation du délaminage de bord libre dans les structures stratifiées pseudo-tissées. Sciences de l'ingénieur [physics]. École Nationale Supérieure des Mines de Paris, 2007. Français. ⟨NNT : 2007ENMP1508⟩. ⟨pastel-00003369⟩

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