Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-1817-C7-1820
Influence of cold rolling and fatigue on the residual stress state of a metal matrix compositeE. HANUS1, T. ERICSSON1, J. LU2 and F. DECOMPS3
1 Division of Engineering Materials, Department of Mechanical Engineering, Linköping University 581 83 Linköping, Sweden
2 Département Matériaux, Centre Technique des Industries Mécaniques, 52 av. Félix Louat, BP. 27, 60304 Senlis cedex, France
3 Régie Nationale des Usines Renault, Direction de la Recherche, 8-10 av. Emile Zola, 92109 Boulogne Billancourt cedex, France
The large difference in the coefficient of thermal expansion between the matrix alloy and the particle in a metal matrix composite gives rise to residual stresses in the material. In the present work the effect of cold rolling and four-point bending fatigue on the residual stress state of a silicon carbide particle reinforced aluminium alloy (AA 2014) has been investigated. The three dimensional stress state measured in both phases : matrix and reinforcement, has been determined by using an X-ray diffraction technique. It was found that cold rolling induces surface compressive macrostresses of about -250 MPa, with a penetration depth around 2 mm. The absolute values of the pseudomacrostresses in both phases are significantly reduced due to the single track rolling. Stress relaxation occurs during four-point bending fatigue.
© EDP Sciences 1993