Full-field dynamic measurement of PLC effect in plastic deformation of Al-alloy by DESPI

Abstract

Electronic Speckle Pattern Interferometry (ESPI) has been developed to make possible to observe dynamic feature of deformation in Dynamic ESPI (DESPI). Precise phase analysis of "subtraction and addition method (SAM) is presented. Plastic deformation process of aluminum alloy (A2017) was analyzed. We found that there are two different features of the plastic deformation process. In the former process, plastic deformation is accompanied by vibration caused by strong energy concentration and relaxation. In the later process, switching between two quasi-stable states was observed frequently. These phenomena will be interpreted by Physical Mesomechanics (PMM)