Abstract
This paper further explores the primary slice removal technique for planar mapping of multiple components of residual stress and describes application to specimens with a range of alloys, geometries, and stress distributions. Primary slice release (PSR) mapping is a combination of contour and slitting measurements that relies on decomposing the stress in a specimen into the stress remaining in a thin slice and the stress released when the slice is removed from a larger body. An initial contour method measurement determines a map of the out-of-plane stress on a plane of interest. Subsequently, removal of thin slices and a series of slitting measurements determines a map of one or both in-plane stress components. Four PSR biaxial mapping measurements were performed using an aluminum T-section, a stainless steel plate with a dissimilar metal slot-filled weld, a titanium plate with an electron beam slot-filled weld, and a nickel disk forging. Each PSR mapping measurement described herein has one (or more) complementary validation measurement to confirm the technique. Uncertainty estimates are included for both the PSR mapping measurements and the validation measurements. Agreement was found between the PSR mapping measurements and validation measurements showing that PSR mapping is a viable technique for measuring residual stress fields.
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Acknowledgements
The authors acknowledge, with gratitude, the U.S. Air Force for providing financial support for this work (contract FA8650-14-C-5026). We would also like to acknowledge Steve McCracken from the Electric Power Research Institute for suppling and fabricating the stainless steel plate with a dissimilar metal slot-filled weld, Brian Streich from Honeywell for providing the nickel forgings, and Andrew Mugnaini from Sciaky for fabricating the titanium samples. Special acknowledgement to Jeffrey Bunn, Paris Cornwell, and Andrew Payzant from Oak Ridge National Laboratory for their help with the neutron diffraction measurements.
A portion of this research was performed at ORNL’s High Flux Isotope Reactor and was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy (proposal IPTS 14081.1).
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Olson, M.D., DeWald, A.T. & Hill, M.R. Assessment of Primary Slice Release Residual Stress Mapping in a Range of Specimen Types. Exp Mech 58, 1371–1388 (2018). https://doi.org/10.1007/s11340-018-0420-5
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DOI: https://doi.org/10.1007/s11340-018-0420-5