Ch., B., A., N., Y., N., R., F. (2008). COMPARATIVE STUDY OF INITIATION FATIGUE LIFE OF FREE DEFECT AND DEFECTIVE MATERIALS. test, 13(13th International Conference on Applied Mechanics and Mechanical Engineering.), 39-46. doi: 10.21608/amme.2008.39257
BOURAOUI Ch.; NASR A.; NADOT Y.; FATHALLAH R.. "COMPARATIVE STUDY OF INITIATION FATIGUE LIFE OF FREE DEFECT AND DEFECTIVE MATERIALS". test, 13, 13th International Conference on Applied Mechanics and Mechanical Engineering., 2008, 39-46. doi: 10.21608/amme.2008.39257
Ch., B., A., N., Y., N., R., F. (2008). 'COMPARATIVE STUDY OF INITIATION FATIGUE LIFE OF FREE DEFECT AND DEFECTIVE MATERIALS', test, 13(13th International Conference on Applied Mechanics and Mechanical Engineering.), pp. 39-46. doi: 10.21608/amme.2008.39257
Ch., B., A., N., Y., N., R., F. COMPARATIVE STUDY OF INITIATION FATIGUE LIFE OF FREE DEFECT AND DEFECTIVE MATERIALS. test, 2008; 13(13th International Conference on Applied Mechanics and Mechanical Engineering.): 39-46. doi: 10.21608/amme.2008.39257

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, Pages 39-46    PDF (583.5 K)
Document Type: Original Article
DOI: 10.21608/amme.2008.39257
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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