Digital image correlation using Newton-Raphson method of partial differential correction |
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Authors: | H A Bruck S R McNeill M A Sutton W H Peters III |
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Institution: | (1) Department of Mechanical Engineering, University of South Carolina, 29208 Columbia, SC |
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Abstract: | Digital image correlation is finding wider use in the field of mechanics. One area of weakness in the current technique is
the lack of available displacement gradient terms. This technique, based on a coarse-fine search method, is capable of calculating
the gradients. However the speed at which it does so has prevented widespread use. Presented in this paper is the development
and limited experimental verification of a method which can determine displacements and gradients using the Newton-Raphson
method of partial corrections. It will be shown that this method is accurate in determining displacements and certain gradients,
while using significantly less CPU time than the current coarse-fine search method.
Paper was presented at the 1988 SEM Spring Conference on Experimental Mechanics held in Portland, OR on June 5–10. |
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