Solution of the Moire Hole Drilling Method Using a Finite-Element-Method-Based Approach

摘要

The moire hole drilling method in a biaxially loaded infinite plate in plane stress is an inverse problem that exhibits a dual nature: The first problem results from first drilling the circular hole and then applying the biaxial loads, while the other problem arises from doing the opposite, i.e., first applying the biaxial load and then drilling the circular hole. The first problem is hardly ever addressed in the literature but implies that either separation of stresses or material property identification may be achieved from interpreting the moire signature around the hole. The second is the well known problem of determination of residual stresses from interpreting the moire fringe orders around the hole. This paper addresses the first inverse problem mentioned above using the finite element method as the means to model the plate with a hole and a least-squares optimization approach to resolve for the quantities of interest. In evaluating an experimental result in a finite width plate the results are found to be in agreement.