I've been studying the contour method for measuring residual stress. See https://www.lanl.gov/contour/ if you are not familiar.
In the contour method, a single cut is made all the way through the workpiece.
What if the cut was made only part of the way through the workpiece? Would such a cut be sufficient to estimate the component of stress normal to the cutting plane?
Has anyone ever tried this or seen any work which tries to do this?