Topic
Digital image correlation
About: Digital image correlation is a research topic. Over the lifetime, 7842 publications have been published within this topic receiving 132166 citations.
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TL;DR: In this article, an imaging technique developed to study the strain localization phenomena that occur during the tension of thin, flat steel samples is presented, where the data are processed using digital speckle image correlation to derive the two in-plane components of the displacement vectors.
Abstract: This paper presents an imaging technique developed to study the strain localization phenomena that occur during the tension of thin, flat steel samples. The data are processed using digital speckle image correlation to derive the two in-plane components of the displacement vectors. The authors observe that the calculation of the intercorrelation function reveals a systematic error and propose a numerical method to limit its influence. Plastic incompressibility and thin-sheet assumptions are used to derive the third displacement component and, hence, the various strain and strain rate components. Numerous checks are presented at each step in processing the data to determine the final accuracy of the strain measurements. It is estimated that this accuracy is quite sufficient to track the inception and the development of localization. Examples of possible application are presented for mild steels whose strain localization mechanisms appear to be precocious and gradual.
298 citations
TL;DR: In this article, a series of baseline displacement measurements have been obtained using 2D Digital Image Correlation (2D-DIC) and images from Scanning Electron Microscopes (SEM).
Abstract: A series of baseline displacement measurements have been obtained using 2D Digital Image Correlation (2D-DIC) and images from Scanning Electron Microscopes (SEM). Direct correlation of subsets from a reference image to subsets in a series of uncorrected images is used to identify the presence of non-stationary step-changes in the measured displacements. Using image time integration and recently developed approaches to correct residual drift and spatial distortions in recorded images, results clearly indicate that the corrected SEM images can be used to extract deformations with displacement accuracy of ±0.02 pixels (1 nm at magnification of 10,000) and mean value strain measurements that are consistent with independent estimates and have point-to-point strain variability of ±1.5 × 10−4.
291 citations
TL;DR: In this article, the microscopic strain distribution of a dual phase steel at the grain scale was measured using digital image correlation based on scanning electron microscopy topography images at large strains, and the results showed how strain is partitioned between the ferritic and martensitic regions.
289 citations
TL;DR: In this article, a split Hopkinson pressure bar testing system is used in conjunction with a load inversion device to perform the high strain rate tension experiments on flat smooth, notched and central hole tensile specimens extracted from advanced high strength steel sheets.
285 citations
TL;DR: In this paper, an experimental-numerical methodology is introduced to strengthen the integrated understanding of microstructure and mechanical properties of multiphase alloys, enabling joint analyses of deformation-induced evolution of the micro-structure, and the strain and stress distribution therein, down to sub-micron resolution.
280 citations