:: Advanced Composites Letters on-line ABSTRACTS ::

Volume 14, Issue 4, 2005
Finite element simulation and experimental determination of residual stresses after extrusion process in Metal Matrix Composites

G.Albertini^1,2, E.Girardin^1,2, A.Giuliani^1,2, D.E.Ilie³, B.P.O’Donnell³ J.P.McGarry³ and P.E.McHugh³

¹Univ.Politecnica delle Marche, Dipartimento di Fisica e Ingegneria dei Materiali e del Territorio, Via Brecce Bianche, 60131 Ancona, Italy
²Istituto Nazionale per la Fisica della Materia (INFM), Ancona Unit, Via Brecce Bianche, 60131 Ancona, Italy
³Micromechanics Research Unit, Department of Mechanical Engineering, National University of Ireland, Galway, Ireland

(Received 4/05; accepted 10/05)

Abstract
The introduction of reinforcement in a Metal Matrix causes micro-stresses which may prove to be very detrimental for the life of the component. Submitting the components to annealing thermal treatments introduces thermal mismatch stresses. They are generated during cooling due to the difference between the thermal expansion coefficient of the two phases. Finite Element Analysis has been performed to study this effect and the results have been experimentally validated by X-ray diffraction, SEM investigation and EDAX on an AA2009 + 25% SiCp extruded shaft for helicopters, simplified as a thin extruded tube.

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