COMPARATIVE STUDY OF INITIATION FATIGUE LIFE OF FREE DEFECT AND DEFECTIVE MATERIALS | ||||
The International Conference on Applied Mechanics and Mechanical Engineering | ||||
Article 37, Volume 13, 13th International Conference on Applied Mechanics and Mechanical Engineering., May 2008, Page 39-46 PDF (583.5 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/amme.2008.39257 | ||||
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Authors | ||||
BOURAOUI Ch.1; NASR A.2; NADOT Y.3; FATHALLAH R.4 | ||||
1Laboratoire de Génie Mécanique, Ecole Nationale d’Ingénieurs de Monastir, Avenue Ibn El Jazzar, 5019 Monastir, Tunisia. | ||||
2Laboratoire de Génie Mécanique, Ecole Nationale d’Ingénieurs de Monastir, AvenueIbn El Jazzar, 5019 Monastir, Tunisia. | ||||
3Laboratoire de Génie Mécanique, Institut supérieur de transport et de la logistique, 4000 Sousse, Tunisia. | ||||
4Laboratoire de Mécanique et de Physique des Matériaux, UMR CNRS no. 6617, ENSMA, Téléport 2, BP 40 109, 86961 Futuroscope Cedex, France. | ||||
Abstract | ||||
ABSTRACT This paper presents an experimental comparison of crack initiation, between free defect and defect material, under High Cycle Fatigue (HCF) loading. Experiments are carried out on a C35 steel. Results show that crack initiation and crack propagation mechanisms for defective material are the same as defect free material: cracks are initiated in the maximum shear plane then they propagate in the plane perpendicular to the maximum principal stress direction. But the length of the stage I cracks of defect materials is always very short in comparison with those of defect free materials. Crack propagation regime life in defect materials is very short, contrary to defect free material which shows an early crack initiation However, contrary to the common belief, the fatigue life initiation is not consumed in defective material and particularly in torsion loading where the cyclic stress tensor becomes complex around the defect. | ||||
Keywords | ||||
Fatigue; crack initiation; crack propagation; material defect | ||||
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