Abstract
The displacement and strain fields of PLC bands are quantitatively measured using a technique based on high-speed digital photography and digital speckle correlation (DSC) method. The results show the nucleation process of a type B band within a few milliseconds, the propagation of a type A band during the capture process and the growth of the deformation bands. The maximum strain rate inside PLC band is over three orders of magnitude larger than the nominal strain rate. The avalanche-like deformation of a PLC band may exceed the displacement of the crosshead within very short time, thus there exists an elastic shrinkage deformation outside a PLC band during avalanche-like deformation. The propagation of type A band, which is traditionally considered to be continuous, is detected to be intermittent in time-resolved results of this paper.
