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 situ synchrotron x-ray imaging and diffraction are used to investigate anisotropic deformation of an extruded magnesium alloy AZ31 under uniaxial compression along two different directions, with the loading axis (LA) either parallel or perpendicular to the extrusion direction (ED), referred to as LA ∥ ED and LA ⊥ ED, respectively.
51 citations
TL;DR: In this paper, a method for measuring chemical shrinkage and coefficient of thermal expansion during cure and post-gelation was presented based on digital image correlation to record the in situ stress-free strain field in a thermosetting polymer.
Abstract: A method for measuring chemical shrinkage and coefficient of thermal expansion during cure and post-gelation is presented based on digital image correlation to record the in situ stress-free strain field in a thermosetting polymer. An independent determination of the resin cure kinetics was required to relate the chemical shrinkage strain and coefficient of thermal expansion to the degree of cure. The changes in the coefficient of thermal expansion were observed from the initial heating to final cooling of the sample. The results obtained are shown to compare favorably with results previously found by other techniques. The proposed method provides a simple and reliable procedure to measure the evolution of thermo-chemical shrinkage properties of the resin during the cure cycle.
51 citations
TL;DR: In this article, a series of shear tests on a 2D analogue granular material has been carried out to measure and characterize the displacement fluctuations and the analysis of their spatial organization reveals the emergence of a minimum length scale that is in the order of 10 times the mean particle size.
Abstract: In a granular material, a macroscopically homogeneous deformation does not correspond to a homogeneous displacement field when looking at the individual grains. The deviation of a grain displacement from the value dictated by the continuum field (referred to as fluctuation) is likely to hold valuable information about the characteristic length(s) involved in grains' rearrangement, which is the principal mechanism of irreversible deformation for granular materials. This paper shows a selection of results from a series of shear tests on a 2D analogue granular material. We have followed the route opened by the pioneering work of Radja\"i and Roux (2002), and used the same framework to analyze our experimental data on displacement fluctuations. Digital Image Correlation has been used to measure and characterize the displacement fluctuations. The analysis of their spatial organization reveals the emergence of a minimum length scale that is in the order of 10 times the mean particle size.
51 citations
TL;DR: In this paper, a full-field, multi-axial computation technique for determining residual stresses using the hole-drilling method with DIC is described, which takes advantage of the large quantity of data available from full field images to ameliorate the effect of modest deformation sensitivity of DIC measurements.
Abstract: A full-field, multi-axial computation technique is described for determining residual stresses using the hole-drilling method with DIC. The computational method takes advantage of the large quantity of data available from full-field images to ameliorate the effect of modest deformation sensitivity of DIC measurements. It also provides uniform residual stress sensitivity in all in-plane directions and accounts for artifacts that commonly occur within experimental measurements. These artifacts include image shift, stretch and shear. The calculation method uses a large fraction of the pixels available within the measured images and requires minimal human guidance in its operation. The method is demonstrated using measurements where residual stresses are made on a microscopic scale with hole drilling done using a Focused Ion Beam – Scanning Electron Microscope (FIB-SEM). This is a very challenging application because SEM images are subject to fluctuations that can introduce large artifacts when using DIC. Several series of measurements are described to illustrate the operation and effectiveness of the proposed residual stress computation technique.
51 citations
TL;DR: The proposed methodology for performing high resolution Digital Image Correlation analysis during high-temperature mechanical tests successfully acquired high-resolution strain maps of the crack tip field in a nickel superalloy sample at 1000 °C.
Abstract: We propose a methodology for performing high resolution Digital Image Correlation (DIC) analysis during high-temperature mechanical tests. Specifically, we describe a technique for producing a stable, high-quality pattern on metal surfaces along with a simple optical system that uses a visible-range camera and a long-range microscope. The results are analyzed with a high-quality open-source DIC software developed by us. Using the proposed technique, we successfully acquired high-resolution strain maps of the crack tip field in a nickel superalloy sample at 1000 °C.
51 citations