Bidimensional strain measurement using digital images
- 1 August 1999
- journal article
- research article
- Published by SAGE Publications in Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
- Vol. 213 (8) , 811-817
- https://doi.org/10.1243/0954406991522428
Abstract
This paper proposes a method that allows a strain field on plane samples to be determined using the digital image correlation method. The displacement field is approximated by an iterative process attempting to optimize the correlation between two pictures, the first one before strain and the second one after strain. The precision obtained on the displacement field can be better than 0.01 pixel. This precision makes it possible to calculate the strains in a large range, from elastic strains (>0.01 per cent) to large strains (>200 per cent), with or without a strain gradient.Keywords
This publication has 4 references indexed in Scilit:
- Optimal image correlation in experimental mechanicsOptical Engineering, 1994
- New approach for evaluating form errors of engineering surfacesComputer-Aided Design, 1987
- Applications of digital-image-correlation techniques to experimental mechanicsExperimental Mechanics, 1985
- A Simplex Method for Function MinimizationThe Computer Journal, 1965