In situ digital image speckle correlation (DISC) observation of plastic strain increment in low-carbon steel

Yulia Li,Svetlana Barannikova

doi:10.31044/0543-5846-2021-60-55-58

Abstract

In situ digital image speckle correlation (DISC) observation of plastic strain increment in low-carbon steel

Highlights

The origin of macrolocalization and strain hardening that act at specific strain stages remains still poorly understood from the physical viewpoint of plastic flow when passing from one stage to another
On the one hand this impedes the complete understanding of materials hardening, but on the other it inhibits the development of technological processing methods involving severe plastic strain
It is known that plastic strain tends to localize at all stages of flow [5,6,7] and takes its origin from the nucleation and propagation of the Lüders (LB) or Portevin-Le Chatelier bands (PLC) [7,8,9]

Summary

INTRODUCTION

The origin of macrolocalization and strain hardening that act at specific strain stages remains still poorly understood from the physical viewpoint of plastic flow when passing from one stage to another. Localized plastic strain has to be thoroughly studied at the different stages of plastic flow [10,11,12,13,14]. In this respect, the present work is aimed at investigating the macroscopic strain localization in low-carbon steel ASTM A 283 Grade C. The evolution of macroscopically localized plastic strain bands at the different stages of strain hardening was visualized via a digital image speckle (DISC) correlation method [15]. The digital images obtained during uniaxial stretching are subjected to processing

AND DISCUSSION

CONCLUSION