Analysis of Wavy Propagation of Plastic Deformation Field by Dynamic ESPI

摘要

A dynamic process of deformation in a tensile experiment of an Al-alloy sample was analyzed by a newly developed ESPI system. In a plastic deformation state after yielding of the mailer, propagating strain concentrated band which corresponds to serration by Portevin-LeChatelier effect was observed. In the band, repetition of increasing and decreasing of number of fringes was observed. The phenomenon means the wavy propagation of a plastic deformation state accompanied by localized strain pulsation. Phase analysis of dynamically deforming object was also done.