Detection Limits of Strain Measurement by Digital Image Correlation Method and its Examples

Abstract

Detection limits of strain measurement by digital image correlation method (DIC) is investigated. Strain and strain rate distributions of stationary non-deformed object are measured by DIC using various subset size, gage length and random pattern size. Strain and strain rate distributions and its statistical value are evaluated. As a result, it is found that background noise in strain and strain rate affected by the parameters. Furthermore, these parameters determine the detection limits of strain and strain measurement.