Results and Experiences from the Application of Digital Image Correlation in Operational Modal Analysis

Hagara, Martin

doi:10.12700/aph.10.05.2013.5.10

Cited by 11 publications

(10 citation statements)

References 9 publications

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“…The DIC system is based on the comparison (correlation) of digital images. A mathematical correlation analysis is applied to compare digital images taken before deformation (“reference image”) and during the deformation process (“deformed image”) (Figure 1, Figure 2 and Figure 3) [16,17,18,21]. At first, a virtual, regular grid of points is placed onto the “reference image”, also called the “specific image” or the “region of interest” (a fragment of the object seen/scanned by the camera before deformation).…”

Section: Fundamentals Of Dicmentioning

confidence: 99%

“…The last stage of the study is the visualization of the results. The output data is a set of displacement/deformation maps [4,6,8,13,16,18,21].…”

Section: Fundamentals Of Dicmentioning

confidence: 99%

“…DIC method—Reference image: facets (also called subsets) marked with blue squares and centre points of the facets/subsets located at the intersection of the yellow virtual grid [17,18]. (The Creative Commons Attribution (CC BY 4.0) license ()).…”

Section: Figurementioning

confidence: 99%

“…Graphical illustration of the selected region deformation of a scanned surface (a square facet/subset/subimage) in a two-dimensional coordinate system [17,18]. (The Creative Commons Attribution (CC BY 4.0) license ()).…”

Section: Figurementioning

confidence: 99%

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Application of Digital Image Correlation (DIC) Method for Road Material Testing

2019

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The theoretical part of the paper presents the framework of the digital image correlation (DIC) method as well as its advantages and limitations. The DIC technique that can be used in static and fatigue tests is a non-contact, non-interferometric optical method for measuring the surface deformation of structural elements, and material samples. In the experimental part of the paper, the implementation of the DIC method for the selected laboratory tests of building materials is described. The results of the tests on the samples of the materials used in road construction, i.e., asphalt mixtures (HMA), stone, soil stabilized with a hydraulic binder, and geosynthetics are discussed. The conducted research pointed out the possibilities of using the DIC method to evaluate the deformation of road materials in laboratory tests, taking into account their specificity. The variety of samples of tested material allowed to indicate the areas in which the DIC method and the algorithms used to evaluate the results give a significant advantage compared to tensometric measurement methods.

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Section: Fundamentals Of Dicmentioning

confidence: 99%

“…The last stage of the study is the visualization of the results. The output data is a set of displacement/deformation maps [4,6,8,13,16,18,21].…”

Section: Fundamentals Of Dicmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Application of Digital Image Correlation (DIC) Method for Road Material Testing

2019

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“…An overview of non-contact modal analysis methods, including the use of high-speed DIC, is presented by Avitabile et al [4]. The application of a Dantec Q-450 high-speed DIC system to operational modal analysis is described by Trebuňa et al [5], focussing on the additional software to perform the necessary post-processing of the DIC data.…”

Section: Introductionmentioning

confidence: 99%

Digital Image Correlation Vibrometry with Low Speed Equipment

Warburton

Buss

et al. 2016

Exp Mech

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A low-cost method is presented which enables digital image correlation (DIC) with conventional cameras (i.e. not high-speed) to be used for determination of vibration deflected shapes via the use of a stroboscopic lamp and some simple ancillary circuits. For each natural frequency of the structure under consideration, a sequence of images is captured asynchronously with the vibrations using the DIC system and the resulting displacement fields are correlated with the excitation signal driving the vibration using a least-squares approach. Three approaches for performing this correlation are outlined, one of which is developed into the algorithm used for processing the present results to obtain the amplitude and phase of the vibration at each point on the specimen, allowing the deflected shape to be reconstructed. This process is illustrated using the example of a vibrating aluminium plate. The resulting shapes and frequencies agree well with finite element modal analyses of the plate.

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Modal characterization of crack network development in an MgO containing refractory castable

Sciuti

Vargas

Canto

et al. 2023

The Journal of Strain Analysis for Engineering Design

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Damage due to MgO hydration in castables has been studied by bar resonance and recently by Digital Image Correlation (DIC). The hydration reaction kinetics was studied via principal component analyses (PCA) applied to DIC results of images acquired during 60 h of curing and drying of an MgO containing refractory castable. The experiment was carried out in a in-house climatic chamber at 50°C and 50% of relative air humidity. The displacement and maximum eigen strain fields were obtained via DIC. Their PCA revealed the crack network as the most relevant component, with a temporal development of a sigmoidal curve where a two-parameter Weibull law was satisfactorily fitted. The reaction duration was virtually identical for both fields, and only a time shift in reaction initiation and saturation was attributed to the choice of field. The approach allows the need for user-defined thresholds to be avoided for crack quantification.

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Results and Experiences from the Application of Digital Image Correlation in Operational Modal Analysis

Cited by 11 publications

References 9 publications

Application of Digital Image Correlation (DIC) Method for Road Material Testing

Application of Digital Image Correlation (DIC) Method for Road Material Testing

Digital Image Correlation Vibrometry with Low Speed Equipment

Modal characterization of crack network development in an MgO containing refractory castable

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