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Amorçage et propagation initiale de délaminages dans les reprises de plis de matériaux composites stratifiés carbone-époxy

Dufresne, Xavier and Lachaud, Frédéric and Michel, Laurent and Barrau, Jean-Jacques Amorçage et propagation initiale de délaminages dans les reprises de plis de matériaux composites stratifiés carbone-époxy. (2005) In: 14ème Journées Nationales sur les Composites (JNC 14 ), 22-24 Mars 2005, Compiègne, France .

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Abstract

For composite laminates thickness optimisation, this article is focused on the thickness variation problems in laminates manufactured with plies drop-offs. The ends of plies within the laminates infer three-dimensional stresses and singularities. Some tests were achieved on specific test pieces for 9 to 5 plies transitions. With optical investigations, these tests showed non-stationary delamination for a particular strength. Some radiographies were done to watch the extent of delaminated areas, and a finite element model enabled us to define an initiation criterion in the ends of the plies with the energy restitution rates and to determine the characteristics of delaminations growing, as analogy to singularities of geometrical accidents.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):National conference proceedings
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA
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Deposited By:Xavier Dufresne

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