Abstract
High-gradient strain field measurement is attracting more attention from both engineering and scientific domains, where digital image correlation (DIC) is widely adopted to recover the dramatically changing displacement fields of stressed samples. Accurate reconstruction of reliable strain field from noisy displacement field is one of the key issues, since the strain calculation is highly sensitive to the displacement noise. The formally proposed improved Hermite finite element smoothing method [1] (IHFESM) and fast Hermite element method (FHEM) [2] are effective global Hermite method based on Tikhonov regularization. However, complex meshing process and high computation burden are inevitable downsides. In this work, we present a local version of FHEM, i.e. the local Hermite method, in which the Hermite element is taken as a smoothing window centered on one displacement data, and the whole field is handled point-wisely. The smoothed displacement and strain are consequently computed from the regularized local surface as in FHEM. The proposed method can deal with arbitrarily shaped region of interest, and is especially suitable for high gradient strain measurement due to the rich high gradient components contained in C2 continuous Hermite element. Experiments show that the local Hermite method is more accurate than global Hermite method such as FHEM and IHFESM.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Similar content being viewed by others
References
Zhao, J., Zeng, P., Pan, B., Lei, L., et al.: Improved Hermite finite element smoothing method for full-field strain measurement over arbitrary region of interest in digital image correlation. Opt. Lasers Eng. 50(11), 1662–1671 (2012)
Zhao, J., Song, Y., Wu, X.: Fast Hermite element method for smoothing and differentiating noisy displacement field in digital image correlation. Opt. Lasers Eng. 68(0), 25–34 (2015)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2019 The Society for Experimental Mechanics, Inc.
About this paper
Cite this paper
Li, X., Zhao, J., Shuai, J., Zhang, Z., Wu, X. (2019). Accurate Reconstruction of High-Gradient Strain Field in Digital Image Correlation: A Local Hermite Scheme. In: Lamberti, L., Lin, MT., Furlong, C., Sciammarella, C., Reu, P., Sutton, M. (eds) Advancement of Optical Methods & Digital Image Correlation in Experimental Mechanics, Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-97481-1_22
Download citation
DOI: https://doi.org/10.1007/978-3-319-97481-1_22
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-97480-4
Online ISBN: 978-3-319-97481-1
eBook Packages: EngineeringEngineering (R0)