3D Numerical modelling of turning-induced residual stresses in 316L stainless steel

Abstract

This paper lies in the framework of turning-induced residual stress prediction by presenting an up-dated method based on a two-scale approach. Previous works aimed at building a 3D hybrid method consisting in modelling the turning consequences through equivalent thermo-mechanical loadings combining a finite element model with experimental tests. The new proposed global hybrid strategy keeps the same concept but has the advantage to define the thermo-mechanical shapes more accurately thanks to local 2D orthogonal cutting models. After carefully detailing each step of the numerical method, a validation case study concerning a longitudinal turning operation on a 316L austenitic stainless steel is proposed. By comparing numerical results with experimental residual stresses coming from X-Ray diffraction, the new numerical method shows its superiority to predict, within few hours, much more accurately the residual stress state induced by a real longitudinal turning operation.