Applications

Abstract

This chapter presents three possible applications of the present theory in conjunction with the Electronic Speckle-Pattern Interferometry (ESPI). The first application is the charge-like-pattern observed as an interferometric image discussed in Chap. 7 to the diagnosis of the deformation status of a given specimen. Experiments indicate that the dynamic characteristic of the pattern is useful to diagnose the level of stress concentration and predict the location of fracture. The second application is the plastic deformation and fracture criteria derived from the present theory. With the use of ESPI fringe patterns, the criteria can be used to evaluate the deformation status of a given part of the specimen as a full-field image without numerically processing the interferometric data. An experiment verifies the validity of the criteria by revealing plastic zone as well as the zone in the pre-fracture stage of the deformation. The third application is to reveal the load hysteresis based on the behavior of the interferometric fringe patterns. The fringe patterns are observed in preloaded specimen with the application of a low level tensile load.