ABSTRACT
One of the most interesting topic demanded to experimental mechanics is the capability to determinate the strain and the stress fields on specimens using non-invasive methods. The most promising methods involves photographic techniques, such as digital image correlation [Sutton 1983, Lagattu 2004, Sutton 2009, Cofaru 2010]. Usually the strain and motion analysis procedures make use of a sequence of pictures that follows the whole strain progress [Broggiato 2006]. In this paper a method that makes use only of two images is proposed; the first, takenwith no applied load, the second one when all loads and deformations are settled.
