In-Situ Sub-Surface Strain Measurement in Deep Rolling Processes

Deep rolling is a common machining process, which is used to induce residual stress into the surface area of steel workpieces. However, the formation of the residual stress is merely understood. We present a method to measure subsurface strain in-situ during a deep rolling process. The strain is measured by sensorial inlays, which are integrated into the machined workpiece. The recorded strain data can be used to describe the formation of residual stress in the surface area of the workpiece as well as to verify modelling results of the deep rolling process.