Paper number 275
|MODELLING OF TRANSVERSE CRACKING UNDER UNIAXIAL FATIGUE LOADING IN CROSS-PLY COMPOSITE LAMINATES : EXPERIMENTAL VALIDATION|
C. Henaff-Gardin, I. Goupillaud, M.C. Lafarie-Frenot, S. Buhr
Laboratoire de Mécanique et de Physique des Matériaux, ENSMA, BP 109,
86960 FUTUROSCOPE CEDEX, FRANCE
|Summary||The purpose of this study is to validate a previous analysis of a cross-ply laminate containing cracks in each layer and submitted to a thermomechanical in-plane loading. The application of this approach to the case of unidirectional mechanical fatigue of (0m/90n)s lay-ups allows to predict :
- the fatigue cycle number necessary for the initiation of the first matrix cracks,
- the kinetics of this damage, as well as the stage of saturation,
in any cross-ply laminate submitted to any uniaxial fatigue loading.
In this work, this approach is validated for two (0m/90n)s lay-ups and two fatigue loading amplitudes. From results obtained by 3D FEM calculations, an extension to (90m/0n)s laminates is proposed. This extension permits to obtain a good agreement between predicted and experimental crack density values at saturation but fails in reproducing fatigue cracking kinetics in such stacking sequences.
|Keywords|| CFRP, composite laminates, fracture mechanics, fatigue, mode I, transverse cracks, aerospace applications, durability.
Theme : Mechanical and Physical Properties ; Fatigue
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