INVESTIGADORES
OLLER  Sergio Horacio Cristobal
congresos y reuniones científicas
Título:
Plastic damage model for fatigue in composites
Autor/es:
L. BARBU; X. MARTINEZ; S. OLLER; A. BARBAT
Lugar:
LISBON
Reunión:
Conferencia; ICCS18 - 18th International Conference on Composite Structures; 2015
Institución organizadora:
ICCS18
Resumen:
This work proposes a plastic damage constitutive model at composite constituent level that accounts for fatigue effects by affecting both the strength and the stiffness of the composite component. The behavior of the composite material will be obtained by means of the rules of mixtures (ROM) theory [1].The constitutive model is based on the ?Barcelona Plastic Damage Model? [2] and makes use of the integration scheme proposed by Luccioni et al. [3] for the simultaneous integration of damage and plasticity constitutive equations. Its capabilities of dealing with ?Ultra-Low-Cycle Fatigue? in steel have been studied by Martinez et al. [4] and offered good results in terms of life prediction and hysteresis loop, both for constant amplitude cyclic loading and for random cyclic loading. The application of the model for ?Low-Cycle Fatigue? has been shown in Barbu et al. [5] also for metallic materials.The present work explores the use of the coupled plastic damage model and ROM theory for composite materials where the failure occurs in the ?Low-Cycle Fatigue? regime and is due to either component failure or to delamination between matrix and fiber. At component level, the model is valid for materials with a softening behavior and materials that exhibit first hardening and then softening. Numerical examples will be shown in order to betterillustrate the model behavior for carbon fiber/ epoxy matrix composites.