RESIDUAL STRESS MEASUREMENTS ON A SHRINK-FIT RING AND PLUG SAMPLE USING 3D DIC BASED HOLE DRILLING AND COMPARISON WITH NEUTRON SCATTERING AND BRAGG EDGE IMAGING

Recent advances in additive manufacturing of metals has provided the ability to print net shape components with complex geometry and multi-materials. To overcome the challenges associated powder bed fusion where material undergoes melting and recrystallization with varying cooling rates, solid state additive methods such as friction stir and cold spray have shown increasing promise. Urgent need exists on developing reliable residual stress methods of engineering relevance to evaluate these materials for qualification. In this study, the modified hole drilling method described by ASTM E837 with the integration of three-dimensional digital image correlation to measure surface strains in place of strain gages was implemented. The specimen used in this study, a shrink fit aluminum alloy 7050 ring and plug assembly obtained from extruded bar stock, was inspired by VAMAS project to establish a recommended procedure for making residual stress measurements in crystalline materials using neutron diffraction. Non-destructive spatial determination of residual stress was determined using neutron diffraction at the High Intensity Diffractometer for Residual Stress Analysis (HIDRA) at the High Flux Isotope Reactor. The VENUS neutron beamline was utilized to conduct spatially resolved Bragg edge imaging for comparison. The microstructure of the Aluminum alloy was carefully characterized using optical microscopy and electron back scattered diffraction. Results will be presented for establishing a standard of reference for residual stress community.