Contribution a la Modelisation de l'Endommagement de Fatigue en Flexion dans les Materiaux Composites Unidirectionnels (Contribution to Modeling Flexion Fatigue Damage in Unidirectional Composite Materials)

摘要

Local damage laws are investigated using the Kachanov Rabotnov theory and global mechanical measurements in fixed stress or strain flexion tests. The model is identified from results obtained with glass-epoxy composite materials in three point flexion tests. The dispersion notion is introduced applying a Weibull law to one of the coefficients of the damage evolution law. The results show that identifying damage laws is possible if the dispersion of mechanical properties is included in the model.