Direct Observation of Developed Plastic Deformation and Its Application to Nondestructive Testing

Abstract

A band pattern representing what we believe to be a developed, localized plastic deformation has been discovered in a fringe system formed by electronic speckle-pattern interferometry. Time historical tracing of this pattern enables us to predict the location and timing of material fracture before any other visible indication appears. Application of this observation to nondestructive testing is discussed.