Residual Stresses prediction with a new Thermo Mechanical simulation of Grinding

The grinding process consists of an abrasive contact between a moving workpiece and a wheel in rotation [1]. Because of the grinding power converted into heat at the interface, high temperatures can appear that can lead to thermal, mechanical or metallurgical consequences. Each of these effects has been fully related in literature by authors. Guo presents a good review of surface layers (dark, white layers) in grinding compared with hard turning [2]. On the same idea, Barbacki has shown the effects of grinding not only on microstructure but also on material characteristics [3]. Moreover, it has been demonstrated that there is a relation between nanohardness and the residual stresses of surfaces [4]: generally the nanohardness increases with the compressive stresses and decreases with tensile stresses. Finally few authors have tried to model residual stresses in relation with the grinding power [5]. Nowadays, the main field of interest in grinding is the prediction of residual stresses due to grinding which takes into account not only thermal and mechanical aspects but also metallurgical transformations. 2 GRINDING MODELING