Measurement of residual stress by the hole-drilling method: General stress-strain relationship and its solution

When a hole is drilled at any position with respect to the gages in a thin plate, a general relationship of relieved strain as a function of residual stress is presented. A simple and explicit solution for the principal residual stresses and their directions is also presented. This solution is available for the center or off-center hole-drilling cases and for the case of which the array of gages is arbitrary.