Study on the Development of the Digital Image Correlation Measurements Program for Measuring the 3-Point Bending Test

Choi, In Young; Kang, Youngjin; Hong, Kyung Min; Ko, Kwang Su; Kim, Sung Jong

doi:10.7736/kspe.2014.31.10.889

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…Fayyad and Lees [11] used this technique to measure the mode I crack propagation in reinforced concrete structures. Choi et al [12] used this technique to measure the deflection of aluminum specimens. Ko et al [13] suggested a technology to measure the displacement and vibration of rock columns by using digital image correlation and analyzed its applicability through field tests.…”

Section: Introductionmentioning

confidence: 99%

Experiment-Based Synthetic Structural Analysis Combining Digital Image Processing and a Strong Form Meshfree Method

et al. 2020

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This paper presents an experiment-based synthetic structural analysis method that combines digital image processing (DIP) and the particle difference method (PDM), which is a strong form-based meshfree method. The proposed method uses images to determine the displacement of deformed specimens, interpolates the displacement onto nodes of the PDM model without meshes or grids, and calculates the kinematic variables. Furthermore, the pixel extraction method for the target area and the method of setting the region of interest for expediting DIP were used during the synthetic structural analysis. A method for effectively expanding the number of tracking points and an improved method for labeling tracking points are also presented. To verify the performance of the analysis, the experimental and numerical analysis results of a three-point bending test on a rubber beam were compared in terms of various mechanical variables as well as with the PDM results of a simulated bending test. It was found that tracking point expansion and adjusting the radius of the domain of influence are advantageous for performing an accurate calculation without losing computational efficiency. It was demonstrated that the synthetic structural analysis effectively overcomes the shortcomings of the conventional experiments and the limitations of pure simulations.

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Section: Introductionmentioning

confidence: 99%

Experiment-Based Synthetic Structural Analysis Combining Digital Image Processing and a Strong Form Meshfree Method

et al. 2020

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Theoretical–experimental study of the bending behavior of thin-walled rectangular tubes

Rincón-Dávila

Alcalá

Martı́n

2022

Thin-Walled Structures

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Analysis of the Effect of Corner Points and Image Resolution in a Mechanical Test Combining Digital Image Processing and Mesh-free Method

Park,

Jeong,

Yoon

2024

J. Comput. Struct. Eng. Inst. Korea

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In this paper, we presen t a DIP-MLS testing method that combines digital image processing with a rigid body-based MLS differencing approach to measure mechanical variables and analyze the impact of target location and image resolution. This method assesses the displacement of the target attached to the sample through digital image processing and allocates this displacement to the node displacement of the MLS differencing method, which solely employs nodes to calculate mechanical variables such as stress and strain of the studied object. We propose an effective method to measure the displacement of the target's center of gravity using digital image processing. The calculation of mechanical variables through the MLS differencing method, incorporating image-based target displacement, facilitates easy computation of mechanical variables at arbitrary positions without constraints from meshes or grids. This is achieved by acquiring the accurate displacement history of the test specimen and utilizing the displacement of tracking points with low rigidity. The developed testing method was validated by comparing the measurement results of the sensor with those of the DIP-MLS testing method in a three-point bending test of a rubber beam. Additionally, numerical analysis results simulated only by the MLS differencing method were compared , confirming that the developed method accurately reproduces the actual test and shows good agreement with numerical analysis results before significant deformation. Furthermore, we analyzed the effects of boundary points by applying 46 tracking points, including corner points, to the DIP-MLS testing method. This was compared with using only the internal points of the target, determining the optimal image resolution for this testing method. Through this, we demonstrated that the developed method efficiently addresses the limitations of direct experiments or existing mesh-based simulations. It also suggests that digitalization of the experimental-simulation process is achievable to a considerable extent.

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Study on the Development of the Digital Image Correlation Measurements Program for Measuring the 3-Point Bending Test

Cited by 3 publications

References 5 publications

Experiment-Based Synthetic Structural Analysis Combining Digital Image Processing and a Strong Form Meshfree Method

Experiment-Based Synthetic Structural Analysis Combining Digital Image Processing and a Strong Form Meshfree Method

Theoretical–experimental study of the bending behavior of thin-walled rectangular tubes

Analysis of the Effect of Corner Points and Image Resolution in a Mechanical Test Combining Digital Image Processing and Mesh-free Method

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