Two-dimensional Mapping of Bulk Residual Stress Using Cut Mouth Opening Displacement

Abstract Background Prior work described an approach for mapping the two-dimensional spatial distribution of biaxial residual stress in plate-like samples, combining multiple slitting measurements with elastic analysis. Objective This paper extends prior by applying a new variation method that uses cut mouth opening displacement (CMOD) rather than back-face strain (BFS). Methods First, CMOD is validated using experiment where: BFS and are measured simultaneously on same sample during incremental slitting; two profiles computed, one from data second data; compared. Following validation, adjacent used to construct maps plates quenched aluminum. Results The versus depth profiles, each computed separately or data, agreement, compression near plate boundaries (-150 MPa) tension center (100 MPa); differences between have maximum 25 MPa RMS 7.2 MPa. Repeated show technique repeatable, complementary contour mappings valid. Aspects deformations also they generally but favorable narrow samples.