Recently, Hill Engineering posted a new case study detailing our research into contour method repeatability. In the case study, we performed contour method measurements on multiple similar specimens belonging to six different specimen types: aluminum T-section, stainless steel plate with dissimilar metal slot-filled weld, stainless steel forging, titanium plate with electron beam slot-filled weld, nickel disk forging, and aluminum plate.
Five to twelve measurements were run in each group, and afterward residual stress analysis was performed to determine a repeatability standard deviation for each population. As expected, the results for specimens within the groups were similar, leading to a relatively small standard deviation throughout the part interior with localized regions of higher standard deviation along the surface perimeter.
For a more detailed look, please read the full case study. For more information about our contour method residual stress measurement capabilities, please contact us.