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A three-frame digital image correlation (DIC) method for the measurement of small displacements and strains

Corneliu Cofaru UGent, Wilfried Philips UGent and Wim Van Paepegem UGent (2012) MEASUREMENT SCIENCE & TECHNOLOGY. 23(10).
abstract
Digital image correlation (DIC) has become a well established approach for the calculation of full-field displacement and strains within the field of experimental mechanics. Since their introduction, DIC methods have been relying on only two images to measure the displacements and strains that materials undergo under load. It can be foreseen that the use of additional image information for the calculus of displacements and strains, although computationally more expensive, can positively impact DIC method accuracy in both ideal and challenging experimental conditions. Such accuracy improvements are especially important when measuring very small deformations, which still constitutes a great challenge: small displacements and strains translate into equally small digital image intensity changes on the material’s surface, which are affected by the digitization processes of the imaging hardware and by other image acquisition effects such as image noise. This paper proposes a new threeframe Newton-Raphson DIC method and evaluates it from the accuracy and speed standpoints. The method models the deformations that are to be measured under the assumption that the deformation occurs at approximately the same rate between each two consecutive images in the three image sequences that are employed. The aim is to investigate how the use of image data from more than two images impacts accuracy and what is the effect on the computational speed. The proposed method is compared with the classic two-frame Newton-Raphson method in three experiments. Two experiments rely on numerically deformed images that simulate heterogeneous deformations. The third experiment uses images from a real deformation experiment. Results indicate that although it is computationally more demanding, the three-frame method significantly improves displacement and strain accuracy and is less sensitive to image noise.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
GRADIENT, ALGORITHM, MULTIFRAME MOTION ESTIMATION, digital image correlation, speckle image, sub-pixel accuracy, three-frame DIC
journal title
MEASUREMENT SCIENCE & TECHNOLOGY
MES. SCI. TECH.
volume
23
issue
10
article_number
105406
pages
14 pages
Web of Science type
Article
Web of Science id
000308920800037
JCR category
ENGINEERING, MULTIDISCIPLINARY
JCR impact factor
1.435 (2012)
JCR rank
21/88 (2012)
JCR quartile
1 (2012)
ISSN
0957-0233
DOI
10.1088/0957-0233/23/10/105406
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2082385
handle
http://hdl.handle.net/1854/LU-2082385
date created
2012-04-09 12:40:56
date last changed
2013-10-22 11:06:26
@article{2082385,
  abstract     = {Digital image correlation (DIC) has become a well established approach for the calculation of full-\unmatched{fb01}eld displacement and strains within the \unmatched{fb01}eld of experimental mechanics. Since their introduction, DIC methods have been relying on only two images to measure the displacements and strains that materials undergo under load. It can be foreseen that the use of additional image information for the calculus of displacements and strains, although computationally more expensive, can positively impact DIC method accuracy in both ideal and challenging experimental conditions. Such accuracy improvements are especially important when measuring very small deformations, which still constitutes a great challenge: small displacements and strains translate into equally small digital image intensity changes on the material{\textquoteright}s surface, which are a\unmatched{fb00}ected by the digitization processes of the imaging hardware and by other image acquisition e\unmatched{fb00}ects such as image noise. This paper proposes a new threeframe Newton-Raphson DIC method and evaluates it from the accuracy and speed standpoints. The method models the deformations that are to be measured under the assumption that the deformation occurs at approximately the same rate between each two consecutive images in the three image sequences that are employed. The aim is to investigate how the use of image data from more than two images impacts accuracy and what is the e\unmatched{fb00}ect on the computational speed. The proposed method is compared with the classic two-frame Newton-Raphson method in three experiments. Two experiments rely on numerically deformed images that simulate heterogeneous deformations. The third experiment uses images from a real deformation experiment. Results indicate that although it is computationally more demanding, the three-frame method signi\unmatched{fb01}cantly improves displacement and strain accuracy and is less sensitive to image noise.},
  articleno    = {105406},
  author       = {Cofaru, Corneliu and Philips, Wilfried and Van Paepegem, Wim},
  issn         = {0957-0233},
  journal      = {MEASUREMENT SCIENCE \& TECHNOLOGY},
  keyword      = {GRADIENT,ALGORITHM,MULTIFRAME MOTION ESTIMATION,digital image correlation,speckle image,sub-pixel accuracy,three-frame DIC},
  language     = {eng},
  number       = {10},
  pages        = {14},
  title        = {A three-frame digital image correlation (DIC) method for the measurement of small displacements and strains},
  url          = {http://dx.doi.org/10.1088/0957-0233/23/10/105406},
  volume       = {23},
  year         = {2012},
}

Chicago
Cofaru, Corneliu, Wilfried Philips, and Wim Van Paepegem. 2012. “A Three-frame Digital Image Correlation (DIC) Method for the Measurement of Small Displacements and Strains.” Measurement Science & Technology 23 (10).
APA
Cofaru, C., Philips, W., & Van Paepegem, W. (2012). A three-frame digital image correlation (DIC) method for the measurement of small displacements and strains. MEASUREMENT SCIENCE & TECHNOLOGY, 23(10).
Vancouver
1.
Cofaru C, Philips W, Van Paepegem W. A three-frame digital image correlation (DIC) method for the measurement of small displacements and strains. MEASUREMENT SCIENCE & TECHNOLOGY. 2012;23(10).
MLA
Cofaru, Corneliu, Wilfried Philips, and Wim Van Paepegem. “A Three-frame Digital Image Correlation (DIC) Method for the Measurement of Small Displacements and Strains.” MEASUREMENT SCIENCE & TECHNOLOGY 23.10 (2012): n. pag. Print.