Hill Engineering has published a comprehensive case study evaluating the repeatability of contour method residual stress measurements across a variety of materials, processes, and geometries. This study provides valuable insights into the precision of the contour method, reinforcing its reliability for residual stress analysis.
The research examines five different test specimens, including an aluminum T-section, stainless steel plate with a dissimilar metal slot-filled weld, stainless steel forging, titanium plate with an electron beam slot-filled weld, and nickel disk forging. Each material and geometry was selected to represent common industrial applications and stress distributions.
The study involved conducting contour method measurements on multiple similar specimens—ranging from five to ten per material—and analyzing the repeatability standard deviation within each group. The findings show a consistent trend: repeatability standard deviations are generally low throughout the part interior but slightly higher along the perimeter. Results indicate a correlation between material elasticity and repeatability, with standard deviations ranging from 5 MPa for aluminum to 25 MPa for nickel.
You can find the full text from the study here.
For engineers and researchers seeking precise residual stress measurements, this case study underscores the contour method’s accuracy and dependability. For more information about the contour method and how it can fit your residual stress need, please contact us.