Hybrid Digital Image Correlation
Publication: Journal of Engineering Mechanics
Volume 146, Issue 4
Abstract
Digital image correlation (DIC) is a commonly used full-field technique for measuring surface deformations in experimental solid mechanics. It directly provides full-field displacements by comparing digital images of the speckle pattern subsets painted on a structure’s surface in the undeformed and deformed states, respectively. Although DIC measures displacements in solid structures, it is often necessary to determine the individual stress components for proper fatigue and failure analysis. Hybrid digital image correlation (hybrid-DIC) is an experimental-analytical approach where theoretical formulations are combined with DIC displacement data for the identification of the full-field stress components. The present paper demonstrates the ability in providing reliable full-field stresses in numerous two-dimensional (2D) plane stress engineering situations involving circular and irregular geometric discontinuities in isotropic or orthotropic composite materials. Hybrid-DIC’s main advantages are (1) it does not require the differentiation of measured displacements, and (2) it provides stresses at the edges of discontinuities, often the location of maximum stress magnitudes.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request (MATLAB code and DIC raw data for Test scenario II).
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Published In
Journal of Engineering Mechanics
Volume 146 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Mar 8, 2019
Accepted: Jul 23, 2019
Published online: Jan 22, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 22, 2020
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