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	Digital image correlation using iterative least squares and pointwise least squares for displacement field and strain field measurements
	Pan, Bing ; Asundi, Anand ; Xie, Huimin ; Gao, Jianxin
	2010-10-12 ; 2010-10-12
关键词	Digital image correlation Deformation Iterative least squares Pointwise least squares REGISTRATION ALGORITHMS DEFORMATION GRADIENT Optics
中文摘要	Digital image correlation (DIC) method using iterative least squares algorithm (ILS) for displacement field measurement and pointwise least squares algorithm (PLS) for strain field measurement is proposed in this paper. A more general and practical intensity change model is employed with consideration of the linear intensity change of the deformed image, followed by an iterative least squares algorithm for calculating displacement field with sub-pixel accuracy. The concept of correlation function is not used in the ILS method, even though we prove that the algorithm is actually equivalent to the optimization of the sum of squared difference correlation function using improved Newton-Raphson method. Besides, different from the conventional strain estimation approaches based on smoothing the displacement fields first and followed by differentiation of the smoothed displacement fields, a simple yet effective PLS algorithm is proposed for extracting strain fields from the computed displacement fields. The effectiveness and accuracy of the proposed techniques is verified through numerical simulation experiments. A practical application of the algorithms to residual plastic deformation field measurement of GH4169 alloy subjected to tensile fatigue is also presented. (C) 2009 Elsevier Ltd. All rights reserved.
语种	英语 ; 英语
出版者	ELSEVIER SCI LTD ; OXFORD ; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79187]
专题	清华大学
推荐引用方式 GB/T 7714	Pan, Bing,Asundi, Anand,Xie, Huimin,et al. Digital image correlation using iterative least squares and pointwise least squares for displacement field and strain field measurements[J],2010, 2010.
APA	Pan, Bing,Asundi, Anand,Xie, Huimin,&Gao, Jianxin.(2010).Digital image correlation using iterative least squares and pointwise least squares for displacement field and strain field measurements..
MLA	Pan, Bing,et al."Digital image correlation using iterative least squares and pointwise least squares for displacement field and strain field measurements".(2010).

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