On the Digital Image Correlation Technique

Jorge, Zabala; Ronny, Peñafiel; Sotomayor, Oscar

doi:10.1016/j.matpr.2021.07.476

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…One of the recorded images is defined as the reference image for all subsequent analyses. Software using DIC analyzes changes in the position of each point registered on the reference image, over the entire load range [ 39 , 40 , 41 , 42 , 43 , 44 , 45 ]. The DIC analysis results in displacement values from which, in the next step, strains are determined from simple relationships.…”

Section: Methodsmentioning

confidence: 99%

Detection of Destructive Processes and Assessment of Deformations in PP-Modified Concrete in an Air-Dry State and Exposed to Fire Temperatures Using the Acoustic Emission Method, Numerical Analysis and Digital Image Correlation

Adamczak-Bugno,

Lipiec,

Koteš

et al. 2024

Polymers

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This article presents the results of tests carried out to assess the condition of PP-modified concrete. The tests were carried out on samples previously stored at ambient temperature and exposed to temperatures corresponding to fire conditions—300 °C, 450 °C, and 600 °C. Axial compression tests of cube-shaped samples and three-point bending of beams were carried out. During strength tests, acoustic emission (AE) signals were recorded and the force and deformation were measured. Recorded AE events were clustered using the k-means algorithm. The analysis of the test results allowed for the identification of signals characteristic of the individual stages of the material destruction process. Differences in the methods of destruction of samples stored in ambient conditions and those exposed to fire temperatures were also indicated. While loading the samples, measurements were carried out using the digital image correlation (DIC) method, which enabled the determination of displacements. Based on the results of the laboratory tests, a numerical model was developed. The results obtained using different research methods (DIC and FEM) were compared. Tomographic examinations and observations of the microstructure of the tested materials were also carried out. The analyses carried out allowed for a reliable assessment of the possibility of using the acoustic emission method to detect destructive processes and assess the technical condition of PP-modified concrete. It was confirmed that the acoustic emission method, due to differences at low load levels, can be a useful technique for assessing the condition of PP-modified concrete after exposure to fire temperatures. So far, no research directions in a similar field have been identified.

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Section: Methodsmentioning

confidence: 99%

Detection of Destructive Processes and Assessment of Deformations in PP-Modified Concrete in an Air-Dry State and Exposed to Fire Temperatures Using the Acoustic Emission Method, Numerical Analysis and Digital Image Correlation

Adamczak-Bugno,

Lipiec,

Koteš

et al. 2024

Polymers

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“…By using interpolation methods, sub-pixel accuracy is achieved. The output data are a set of displacement maps, which can then be used to calculate strain maps in the (ε xx ,ε yy ) plane [54][55][56][57]. During the laboratory tests, a phone with camera parameters was used to record images of the deforming specimen: 50 Mpx sensor, 0.64 mm pixel size, 1/2.76 inch sensor size, 1920/1080 video resolution, ƒ/1.8.…”

Section: Numerical Analysismentioning

confidence: 99%

Identification of Destruction Processes and Assessment of Deformations in Compressed Concrete Modified with Polypropylene Fibers Exposed to Fire Temperatures Using Acoustic Emission Signal Analysis, Numerical Analysis, and Digital Image Correlation

Adamczak-Bugno,

Lipiec,

Adamczak

et al. 2023

Materials

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This article presents the results of tests conducted to identify the failure process and evaluate the deformation of axially compressed concrete specimens modified with polypropylene fibers (PP). The test specimens were previously stored at ambient temperature and subjected to fire temperatures of 300 °C, 450 °C, and 600 °C. Acoustic emission (AE) signals were recorded during loading, along with force and strain measurements. The recorded AE signals were analyzed using the k-means clustering method. The compilation of the test results made it possible to determine the classes of signals characteristic of different stages of the material failure process and to indicate the differences in the failure mechanisms of specimens stored under ambient conditions and subjected to fire temperatures. Digital image correlation (DIC) measurements were conducted during the strength tests. A numerical model of the material (FEM) was also prepared, and a comparison of the obtained results was carried out.

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“…With the increase in the accuracy and resolution of displacement and strain measurements, DIC has been widely applied in various research fields. [19][20][21][22][23] In terms of plastic material, regard to the large deformation after necking, the conventional tensile test with strain gages and extensometers cannot capture the local strain due to the relatively large gage length. While DIC could precisely measure the local strain and generate a full-field strain map.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of flow stress in nylon 66 via digital image correlation method and response surface method

Wakuta

Nishida

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Nylon 66 is an engineering plastic with the advantageous characteristics of light weight, heat resistance, high strength, and high rigidity; it has been used in automobile parts as a substitute for aluminum alloys. There have also been many studies on the mechanical properties of nylon 66. However, the flow stress in nylon 66 after necking has not been thoroughly investigated yet due to the difficulty in identifying local stress. In this study, a flow stress optimization method based on the digital image correlation (DIC) method and response surface method, is proposed. The averaged true stress–true plastic strain curve is first obtained by a quasi-static tensile test via DIC. Subsequently, the flow stress is optimized via the response surface method to obtain the actual flow stress state after necking. The accurate flow stress in the specimen can be obtained based on the relationship between the global load force and distance between the two shoulders of the specimen grip parts that is unaffected by the cross-sectional area change during necking. The results indicate that the average true stress recorded from the experiment overestimates the flow stress after necking. The optimized flow stress exhibits the maximum decrease of 9%. The accuracy of the optimized flow stress is evaluated by comparison with the true strain distribution on the specimen that is accurately measured via DIC.

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On the Digital Image Correlation Technique

Cited by 5 publications

References 7 publications

Detection of Destructive Processes and Assessment of Deformations in PP-Modified Concrete in an Air-Dry State and Exposed to Fire Temperatures Using the Acoustic Emission Method, Numerical Analysis and Digital Image Correlation

Detection of Destructive Processes and Assessment of Deformations in PP-Modified Concrete in an Air-Dry State and Exposed to Fire Temperatures Using the Acoustic Emission Method, Numerical Analysis and Digital Image Correlation

Identification of Destruction Processes and Assessment of Deformations in Compressed Concrete Modified with Polypropylene Fibers Exposed to Fire Temperatures Using Acoustic Emission Signal Analysis, Numerical Analysis, and Digital Image Correlation

Evaluation of flow stress in nylon 66 via digital image correlation method and response surface method

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