Cold expansion process on hard alloy holes-experimental and numerical evaluation

This paper presents an evaluation of the influence of the cold expansion process on the fatigue performance of holes in hard alloys, as such materials are involved in an increasing number of aeronautical applications. Fatigue enhancement could bring significant savings for numerous possible industri...

Full description

Saved in:
Bibliographic Details
Published in:Mechanics & industry : an international journal on mechanical sciences and engineering applications 2016-01, Vol.17 (3), p.303-16
Main Authors: Achard, Victor, Daidie, Alain, Paredes, Manuel, Chirol, Clément
Format: Article
Language:English
Subjects:
Aeronautics
Aluminum
axisymmetric F.E.M
Cold expansion process
Engineering Sciences
expansion ratio
fatigue performance
Fatigue strength
hard alloy
Industrial applications
Mathematical models
Mechanical engineering
Mechanics
Titanium base alloys
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper presents an evaluation of the influence of the cold expansion process on the fatigue performance of holes in hard alloys, as such materials are involved in an increasing number of aeronautical applications. Fatigue enhancement could bring significant savings for numerous possible industrial applications. However, although the cold expansion of aluminium holes has been studied widely, there have been few publications concerning this process in hard alloys and there is currently very few research activities on technique dedicated to high strength metallic holes. Thus, this work aims to define an approach to understand why processes and methodologies are suitable for obtaining effective expansion of these materials. In this article, the response of expanded holes is studied, considering various experimental parameters and for a wide range of expansion ratios. The influence on the fatigue strength of Ti-6Al-4V tensile specimens is also reported for various expansion ratios, more precisely “standard” expansion ratios and high expansion ratios. Then, a specific numerical modelling of the process is presented, which enables us to understand the impact of high expansion ratios in titanium holes and the influence on fatigue performance. A very good correlation between experimental and numerical results is observed.
ISSN:2257-7777
2257-7750
DOI:10.1051/meca/2015075