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Augmented Lagrangian Digital Image Correlation

Yang, J. and Bhattacharya, K. (2019) Augmented Lagrangian Digital Image Correlation. Experimental Mechanics, 59 (2). pp. 187-205. ISSN 0014-4851. https://resolver.caltech.edu/CaltechAUTHORS:20181206-144519373

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Abstract

Digital image correlation (DIC) is a powerful experimental technique for measuring full-field displacement and strain. The basic idea of the method is to compare images of an object decorated with a speckle pattern before and after deformation, and thereby to compute the displacement and strain fields. Local subset DIC and finite element-based global DIC are two widely used image matching methods. However there are some drawbacks to these methods. In local subset DIC, the computed displacement field may not be compatible, and the deformation gradient may be noisy, especially when the subset size is small. Global DIC incorporates displacement compatibility, but can be computationally expensive. In this paper, we propose a new method, the augmented-Lagrangian digital image correlation (ALDIC), that combines the advantages of both the local (fast) and global (compatible) methods. We demonstrate that ALDIC has higher accuracy and behaves more robustly compared to both local subset DIC and global DIC.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1007/s11340-018-00457-0DOIArticle
https://rdcu.be/bcSOJPublisherFree ReadCube access
ORCID:
AuthorORCID
Bhattacharya, K.0000-0003-2908-5469
Additional Information:© Society for Experimental Mechanics 2018. Received: 19 February 2018; Accepted: 9 November 2018; First Online: 06 December 2018. We are grateful to Dr. Louisa Avellar for sharing her images of heterogeneous fracture with us. We gratefully acknowledge the support of the US Air Force Office of Scientific Research through the MURI grant ‘Managing the Mosaic of Microstructure’ (FA9550-12-1-0458).
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0458
Subject Keywords:Digital image correlation (DIC); Augmented Lagrangian
Issue or Number:2
Record Number:CaltechAUTHORS:20181206-144519373
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181206-144519373
Official Citation:Yang, J. & Bhattacharya, K. Exp Mech (2019) 59: 187. https://doi.org/10.1007/s11340-018-00457-0
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91539
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:07 Dec 2018 15:28
Last Modified:03 Oct 2019 20:35

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