INVESTIGADORES
OLLER  Sergio Horacio Cristobal
artículos
Título:
Fatigue Analysis of Materials and Structures Using a Continuum Damage Model
Autor/es:
O. SALOMON; S. OLLER; E. OÑATE
Revista:
International Journal of Forming Processes
Editorial:
Hermes
Referencias:
Lugar: Cachan; Año: 2002 vol. 5 p. 433 - 453
ISSN:
1292-7775
Resumen:
The scatter in the fatigue life of the metallic structures seems to be mainly causedby internal defects of the material (porosity, inclusions as oxide films and carbon layers,grain boundaries, etc.). As discontinuities in geometry, defects cause stress concentrationand are therefore prone to fatigue crack initiation. Here, a fatigue model based in continuummechanic with its general expressions for the elasto-plastic-damage constitutive equations,previously developed by the authors, is extended to include the effects of material internaldefects. In this stress life approach the material is considered to be non-homogenous. Thematerial strength is randomly assigned and Stress-Nº of cycles curves are scaled downaccording to material strength of each point. Limit values for material strength are based onexperimental tests of samples with different degree of porosity.