Author(s)

G. Donzella, M. Guagliano & L. Vergani

Abstract

Experimental investigations and numerical analyses on deep rolling residual stresses G. Donzella," M. Guagliano,* L. Vergani* " Universitd degli Studi di Brescia, Dipartimento di Ingegneria Meccanica, Via Branze, 38, 25123 Brescia, Italy ^Dipartimento di Meccanica, Poltecnico di Milano, f .zzo I. do Fmcz', 32, 2(%<%? Mz/aTio, 7W%/ ABSTRACT The deep rolling is a mechanical surface treatment widely used to improve the fatigue strength of the notched components. In order to optimize the rolling parameters the surface residual stresses have been calculated by means of a numerical model of a roll compressing a prismatic bar. Experimental measurements of the residual stresses have been carried out on the same numerically modelled bar, by using the hole drilling method and a new method. The results were compared. INTRODUCTION Mechanical and thermal treatments are today widely used to improve the fatigue mechanical characteristics of the materials. In particular, if we co

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