S. V. Panin, V. V. Titkov, P. S. Lyubutin, “Effect of the grid step of the vector displacement field on the strain estimate in the digital image correlation method”, Prikl. Mekh. Tekh. Fiz., 2017, Volume 58, Issue 3,Pages <nobr>57

This article is cited in 6 papers

Effect of the grid step of the vector displacement field on the strain estimate in the digital image correlation method

S. V. Panin^ab, V. V. Titkov^a, P. S. Lyubutin^ab

^a Institute of Strength Physics and Material Science, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055, Russia
^b National Research Tomsk Polytechnical University, Tomsk, 634050, Russia

Abstract: The influence of the grid step of the displacement vector field on the strain estimate in the digital image correlation method is considered. The reasons for the emergence and the magnitude of the strain estimate error in processing optical images of material surfaces with different textures are analyzed. The dependence of the grid step for strain estimation on the magnitude of displacements and also on the presence and size of the discontinuity region in the strain field is studied. An adapted algorithm for choosing the grid step is proposed, which allows the strain calculation error to be reduced by a factor of 1.9 with simultaneous reduction of computational expenses by a factor of 2.1.

Keywords: displacement vector field, grid step, digital image correlation, strain error estimate, texture, Gaussian noise.

UDC: 681.3

Received: 28.01.2016
Revised: 10.06.2016

DOI: 10.15372/PMTF20170307