Effect of cold expansion on improving of fatigue initiation life in Aluminium alloy

Mohamed El Habiri; Mustapha Benachour; Nadjia Benachour

doi:10.3221/IGF-ESIS.46.04

Effect of cold expansion on improving of fatigue initiation life in Aluminium alloy

Authors

Mohamed El Habiri University of Tlemcen, Ingeniery of Mechanical Systems and Materials Laboratory, Tlemcen (Algeria) Faculty of Technology, Mechanical Engineering Department
Mustapha Benachour IS2M Laboratory, University of Tlemcen
Nadjia Benachour University of Tlemcen, Ingeniery of Mechanical Systems and Materials Laboratory, Tlemcen (Algeria)

DOI:

https://doi.org/10.3221/IGF-ESIS.46.04

Keywords:

Fatigue crack initiation, Cold expansion, Compressive residual stress, Stress ratio, Aluminium alloy

Abstract

In this paper, numerical investigation was carried out to quantify the effect of the cold expansion on fatigue crack initiation in Aluminium alloy. The improvement in fatigue initiation life of specimen after the cold expansion process was investigated with the drilled hole of 2024 T351 Aluminium alloy plate. The 4.6 % in degree of expansion is applied witch is associated with the effect of friction (µ=0.2). Residual stress field is determined using 3D Finite Element Analysis and shows the presence of compressive residual stress around the hole. The results showed a high level of compressive residual stress in mild and exit face of hole. Local strain approach is applied in evaluation of fatigue initiation lives under Afgrow environment code. Fatigue initiation lives are improved by the presence of compressive residual and comparatively to the drilled hole. Moreover, increasing in stress ratio, increases the fatigue initiation lives with and without the presence of compressive residuals stresses

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Author Biographies

Mohamed El Habiri, University of Tlemcen, Ingeniery of Mechanical Systems and Materials Laboratory, Tlemcen (Algeria) Faculty of Technology, Mechanical Engineering Department

Phd Student in Materials Sciences
Mustapha Benachour, IS2M Laboratory, University of Tlemcen

Professor and Researcher in Materials Sciences and Mechanical Engineering.

Research in fatigue, fracture of materials, Alloys and Welded materials including residual stresses
Nadjia Benachour, University of Tlemcen, Ingeniery of Mechanical Systems and Materials Laboratory, Tlemcen (Algeria)

Doctor in Physics and Materials Sciences

Department of Physics

Lecturer

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Published

23-09-2018

Issue

Vol. 12 No. 46 (2018): October 2018

Section

SI: Developments in the fracture and fatigue assessment of materials

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Frattura ed Integrità Strutturale (Fracture and Structural Integrity, F&SI) is an open-access journal which means that all content is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author. This is in accordance with the DOAI definition of open access.

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How to Cite

Effect of cold expansion on improving of fatigue initiation life in Aluminium alloy. (2018). Frattura Ed Integrità Strutturale, 12(46), 34-44. https://doi.org/10.3221/IGF-ESIS.46.04