Modeling of Fatigue Crack Propagation in Aluminum Alloys Using an Energy Based Approach

  • F. Khelil Laboratoire de Mécanique de Lille (LML), University of Lille1, France
  • B. Aour Laboratoire de Recherche en Technologie de l’environnement, Ecole Normale Supérieure d'Enseignement Technique d'Oran (ENSET d'Oran), Algeria
  • M. Belhouari Department of Mechanical Engineering, University of Sidi Bel Abbes, Algeria
  • N. Benseddiq Laboratoire de Mécanique de Lille (LML), University of Lille1, France
Keywords: fatigue crack growth, energetic approach, plastic zone, aluminum alloys


Materials fatigue is a particularly serious and unsafe kind of material destruction. Investigations of the fatigue crack growth rate and fatigue life constitute very important and complex problems in mechanics. The understanding of the cracking mechanisms, taking into account various factors such as the load pattern, the strain rate, the stress ratio, etc., is of a first need. In this work an energy approach of the Fatigue Crack Growth (FCG) was proposed. This approach is based on the numerical determination of the plastic zone by introducing a novel form of plastic radius. The experimental results conducted on two aluminum alloys of types 2024-T351 and 7075-T7351 were exploited to validate the developed numerical model. A good agreement has been found between the two types of results.


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