Determination of the residual stress profile of deep-rolled crankshaft grooves

Caracterisation of a residual stress profile is complex in crankshaft's gro oves. Precautions are needed du to the limited accessibility of X'rays in t he groove, the geometry of the groove and the specific stress field induced by the deep rolling. This study has been performed in cooperation between ENSAM and RENAULT and ended at the determination of residual stress profile in crankshaft deep rolled grooves. This article presents the difficulties encountered, the measurement methodology and the caracterisation of a resid ual stress profile in series cast iron GS61 crankshafts.