Mechanics & Industry
Volume 17, Number 3, 2016
|Number of page(s)||16|
|Published online||08 February 2016|
Cold expansion process on hard alloy holes-experimental and numerical evaluation
Universitéde Toulouse, INSA/ICA (Institut Clément Ader),
135 avenue de
Toulouse Cedex 04,
2 Airbus Operations S.A.S., 316 route de Bayonne, 31060 Toulouse Cedex 09, France
a Corresponding author: email@example.com
Received: 2 December 2014
Accepted: 27 September 2015
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.
Key words: Cold expansion process / hard alloy / fatigue performance / expansion ratio / axisymmetric F.E.M.
© AFM, EDP Sciences 2016
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