Multiscale displacement field measurements of compressed mineral-wool samples by digital image correlation.
We propose a multiscale approach to determine the displacement field by digital image correlation. The displacement field is first estimated on a coarse resolution image and progressively finer details are introduced in the analysis as the displacement is more and more securely and accurately determined. Such a scheme has been developed to increase the robustness, accuracy, and reliability of the image-matching algorithm. The procedure is used on two different types of examples. The first one deals with a representative image that is deformed precisely and purposefully to assess the intrinsic performances. In particular, the maximum measurable strain is determined. The second case deals with a series of pictures taken during compression experiments on mineral-wool samples. The different steps ofthe procedure are analyzed and their respective role is assessed. Both reflection and transmission images are tested.
Hild
François
F
LMT-Cachan, ENS de Cachan/CNRS-UMR 8535/ Université Paris 61, France. Francois.Hild@lmt.ens-cachan.fr
Raka
Bumedijen
B
Baudequin
Maud
M
Roux
Stéphane
S
Cantelaube
Florence
F