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A space–time approach in digital image correlation: Movie-DIC

Article dans une revue avec comité de lecture
Author
BESNARD, Gilles
1306 Laboratoire de Mécanique et Technologie [LMT]
ROUX, Stéphane
1306 Laboratoire de Mécanique et Technologie [LMT]
HILD, François
1306 Laboratoire de Mécanique et Technologie [LMT]
ccGUÉRARD, Sandra
99538 Laboratoire de biomécanique [LBM]

URI
http://hdl.handle.net/10985/7334
DOI
10.1016/j.optlaseng.2010.08.012
Date
2011
Journal
Optics and Lasers in Engineering

Abstract

A new method is proposed to estimate arbitrary velocity fields from a time series of images acquired by a single camera. This approach, here focused on a single spatial plus a time dimension, is specialized to the decomposition of the velocity field over rectangular shaped (finite-element) bilinear shape functions. It is therefore assumed that the velocity field is essentially aligned along one direction. The use of a time sequence over which the velocity is assumed to have a smooth temporal change allows one to use elements whose spatial extension is much smaller than in traditional digital image correlation based on successive image pairs. This method is first qualified by using synthetic numerical test cases, and then applied to a dynamic tensile test performed on a tantalum specimen. Improvements with respect to classical digital image correlation techniques are observed in terms of spatial resolution.

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