Expanded digital volume correlation for ex situ applications

Abstract

Full-field deformation/strain measurements are important to experimental mechanics, and the digital volume correlation (DVC) technique is one of the most important techniques for full-field measurement. However, traditional DVC has difficulty in distinguishing deformation displacements and rigid-body displacements in ex situ applications. To expand the applications of traditional DVC, two expanded DVC methods are proposed, based on outer and inner image registration respectively. These methods would remove the rigid motions in ex situ applications. Their performances are thoroughly evaluated. These methods have similar accuracy and precision to traditional DVC. One proposed method is further applied on a low-velocity impact deformation investigation, which would be impossible using traditional DVC. The high accuracy and precision of the methods demonstrate their reliability and feasibility, and the case study on low-velocity impact deformation shows their potential in ex situ applications.