INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Advances in development of a two parameter fatigue crack propagation model for variable amplitud loading
Autor/es:
C. MOLINA; M.D. CHAPETTI
Lugar:
Poitiers
Reunión:
Congreso; FATIGUE 2018; 2018
Institución organizadora:
Sociedad Francesa de Metalurgia y de Materiales (SF2M)
Resumen:
One of the main challenges found in the development of predictive models for variable amplitude fatigue is correlating the effects of applied R-ratio (Kmin/Kmax) on crack growth rates. The search for a two-parameter crack growth model is based on its advantage to account for mean stress effects, without the need of difficult crack closure experimental measurements. The early work of Walker set the basis for the development of several crack growth models that include mean stress effects in the past decades. Additionally to mean stress variation, a complete variable amplitude fatigue analysis must consider load interaction effects. In the present work, the possibility of using a two parameter driving force model for fatigue crack propagation prediction is analysed. A crack propagation rate estimation method is implemented and influence of load interaction phenomena is considered by means of the Wheeler and Willemborg models. Results of fatigue lives calculated with this method are in good agreement when compared to experimental values for different aluminium alloys under various loading histories.