Raouf Fathallah - Academia.edu (original) (raw)

Uploads

Papers by Raouf Fathallah

MATEC Web of Conferences, 2014

International Journal of Fatigue, 2005

... a, Laboratoire de Mécanique, Matériaux et Procédés (SERST-LAB-STI-03), ESSTT, 5 Avenue Taha H... more ... a, Laboratoire de Mécanique, Matériaux et Procédés (SERST-LAB-STI-03), ESSTT, 5 Avenue Taha Hussein, 1008 Montfleury, Tunis, Tunisie. b, Laboratoire de Génie Mécanique (SERST-LAB-MA-05), Institut Supérieur des Sciences ...

International Journal of Fatigue, 2010

The aim of this work is to study the influence of both defect and tension and torsion loading on ... more The aim of this work is to study the influence of both defect and tension and torsion loading on stress number of cycles (S-N) 25 curves for C35 steel. A spherical artificial defect has been machined at the surface of gauge length of fatigue samples. The crack initiation mechanisms have been identified based on several observations on Scanning Electron Microscope (SEM) at different stage of fatigue life. The initiation crack length definition is proposed for defect free and defective material. For defect free material, torsion loading allows relatively earlier initiation compared to tension loading. In the case of defective material, it is observed that, for the both types of loading, initiation fatigue life is not negligible by comparison to total fatigue life. It is also concluded that defects are much more deleterious to fatigue life in the range of high cycle fatigue regime. However, for the limited fatigue lives (between 10 4 and 10 5 cycles), the defect free and defective material S-N curves are relatively comparable.

Engineering Structures, 2011

The analysis of engineering structures under fatigue crack growth aims at ensuring an appropriate... more The analysis of engineering structures under fatigue crack growth aims at ensuring an appropriate reliability level over the entire operational lifetime. This paper deals with a new approach, namely the Stochastic Response Surface, to couple finite element analysis and reliability methods. The stochastic collocation method provides an explicit expression of the limit state function related to fatigue failure. This expression is used in first and second order reliability methods in order to compute the failure probability at a given structural age. When inspection is carried out, the structural reliability can be easily updated in terms of the observed crack length. Two numerical applications dealing with fatigue crack growth are presented to illustrate the proposed method, showing its performance in terms of numerical efficiency and accuracy.

Key Engineering Materials, 2010

Page 1. Finite element prediction of Laser Shock Peened surface modifications in Ti-6Al-4V alloy ... more Page 1. Finite element prediction of Laser Shock Peened surface modifications in Ti-6Al-4V alloy M. FRIJA* 1,a , R. FATHALLAH * 2,b , T. HASSINE * 3,c * Laboratoire de Génie Mécanique, Ecole Nationale d'Ingénieurs de Monastir, Avenue Ibn El Jazzar, 5019 Monastir, Tunisia. ...