Method for estimating a residual stress field in a workpiece during machining and machining process using said method

A method for estimating a residual stress field in a workpiece during machining, said workpiece being obtained from a raw workpiece, said method comprising at least the following steps executed successively:

• a measurement step of measuring geometric parameters of the workpiece at a given moment during machining thereof at which a residual stress field in said workpiece is to be known, in such a manner as to determine a geometric profile of said workpiece;
• a first estimation step of estimating, from the geometric profile and an estimation model, subsequent deformations that the workpiece is liable to undergo during further machining, said estimation model being trained beforehand by machine learning on so-called training workpieces in such a manner as to be able to use the geometric profile of the workpiece and prerecorded data on the training workpieces to estimate said subsequent deformations of the workpiece;
• and
• a second estimation step of estimating from the subsequent deformations estimated during the first estimation step and a simulation model the residual stress field in the workpiece, said simulation model being a generic physical model based on simulations defining a variability of the residual stress field in the workpiece as a function of manufacturing parameters of the raw workpiece.