Author(s)

E. Maronne, A. Galtier, J.-L. Robert & T. Ishikawa

Abstract

Cutting process influence on fatigue steel sheets properties E. ~aronne', A. ~altier', J.-L. ~ o b e r t ~ & T. 1shikawa3 'ARCELOR Innovation, IRSID, Maiziires-Les-Metz Cedex, France '~aboratoire d'Etudes et de Recherches en Me'canique des Structures, IUT de Montluqon, Montluqon Cedex, France 3 NSC Steel Research Laboratories, Shintomi, Futtsu, Chiba, Japan Abstract Accurate fatigue strengths of steel sheets are needed to assess the in-service fatigue life of automotive metallic components. Mechanical parts or structures made from steel sheets are generally obtained by stamping and cutting. In fact mechanical fatigue properties are strongly modified by the machining. Cutting generates a typical shape edge with tremendous geometrical defects that leads to a lowering in steel fatigue strength. The aim of the present paper is to investigate the fatigue properties modifications induced by the mechanical cutting. High cycle fatigue tests have been performed on nine steel grades specimens (with ulti

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