Generalization of Integral Parameters to Fatigue Loading in Room Temperature

TitreGeneralization of Integral Parameters to Fatigue Loading in Room Temperature
Type de publicationChapitre
TypeOuvrage scientifique
Titre de l'ouvrageFracture, Fatigue, Failure and Damage Evolution
AuteurMoutou Pitti, Rostand, Riahi, Hassen , Haile, Mulugeta A
Editeur scientifiqueCarroll, Jay, Xia, Shuman, Beese, Allison M, Berke, R.B., Pataky, G.J.
EditeurSpringer International Publishing
Mots-clésaluminum alloys, crack growth, Experiment, finite element, m-integral, material fatigue
Résumé en anglais

In this paper a numerical approach coupling independent path integrals, such as M-integral, to compute the crack driving forces namely the stress intensity factors, and empirical models, for instance Paris-Erdogan’s law, to assess the cumulative fatigue damage (i.e. crack size) during the crack growth process, is proposed. The M-integral derived from Nother’s theorem combines the real and virtual mechanical deformation and stress fields. A finite element routine is developed in order to compute the energy release rate according to the stress intensity factors. Results are given for a simple standard Al7075-T6 tensile test specimen. Finally, numerical estimates are compared to experimental data for various crack length in order to prove the efficiency and the accuracy of the proposed model.

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