NON PROPORTIONAL LOADING EFFECTS ON FATIGUE CRACK INITIATION AND CRACK GROWTH PATH

L. Reis  M. Freitas  B. Li      

Anales de la Mecánica de la Fractura, nº 25 . 2008 . Pág. -
Ver (.pdf): 6-10

Resumen: Components and structures in industry are generally subjected to multiaxial stress states. There are many multiaxial fatigue models proposed in the literature. For efficient computational fatigue analysis of components and structures, it is required to carry out further validations of multiaxial fatigue models and appropriate approaches for shear stress evaluation under service loading conditions. In this paper, multiaxial fatigue tests were carried out on a quenched and tempered low alloy steel (DIN 42CrMo4) for a wide range of loading paths of tension and torsion. A large number of tests are available for the analysis of the influence of the loading paths on crack initiation, crack path growth and life prediction. Critical plane approaches were used to correlate the results of the experimental tests with the prediction of the crack path orientation and life tests. Results show a strong influence of the studied parameters chosen for the loading paths on fatigue life and crack initiation and are discussed in this paper taking into account the evolution of the stress-strain due to the loading path.

LocalizaciónSigüenza

Dept. Engenharia Mecânica, Instituto Superior Técnico, Technical University of Lisbon Av. Rovisco Pais, 1049-001 Lisboa, Portugal
Dept. Engenharia Mecânica, Instituto Superior Técnico, Technical University of Lisbon Av. Rovisco Pais, 1049-001 Lisboa, Portugal
Dept. Engenharia Mecânica, Instituto Superior Técnico, Technical University of Lisbon Av. Rovisco Pais, 1049-001 Lisboa, Portugal