Choice of numerical model as a key point of holographic interferometry data implementing for hybrid strain/stress analysis

摘要

Abstract: There are some topical mechanical problems in solving of which remarkable features of various holographic interferometric techniques are capable of ensuring an actually new level of data obtained comparing with other experimental methods. One of these problems is a detailed quantitative description of local elasto-plastic strain history in contact interaction zone. Holographic interferometry is still a very complex and time-consuming method for strain/stress analysis, even if modern tools for computer-aided fringe patterns evaluation are available. That is why in most cases holographic techniques using for a predictive strain/stress analysis have to be supplemented with corresponding numerical techniques thus forming so- called combined or hybrid approach. The presentation is devoted to main questions related to a choice of appropriate numerical models which are capable of high-accurate reproducing a local strain history under regular cyclic loading. The main objective of constructing such a model is a determination of 3D local strain fields to within 3% in order to ensure developing new refined techniques for evaluation of fatigue damage accumulation. Holographic interferometry data are consecutively used during a whole step-by-step procedure, first, to choose an initial model and, then, to construct and to validate a set of advanced models.!8