CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, China
Abstract:
In this paper a technique based on high-speed digital photography and the digital
speckle correlation (DSC) method is used for the quantitative measurement of the
displacement and strain fields of various Portevin--Le Chatelier (PLC) bands (types
A, B, and C). The experimental results clearly show the nucleation process of a
type-B band and the propagation of a type-A band. The results also reveal that there
exists an elastic shrinkage deformation outside a PLC band during a large
avalanche-like deformation inside the PLC band.