Introduction to Digital Image Correlation: Best Practices and Applications

Reu, Phillip L.

doi:10.1111/j.1747-1567.2011.00798.x

Cited by 63 publications

(41 citation statements)

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“…A pair of stereo-mounted digital cameras Grasshopper 5.0 MP Mono FireWire 1394b (Point-Grey) equipped with Schneider Kreuznach Xenoplan lenses (Focal length 35 mm, F-number 8), and VIC-Snap8 software were employed to acquire images. Cameras set-up and samples preparation were determined in order to minimize uncertainties and noise level during image postprocessing (Reu, 2012). For this reason, a stereo-angle of ca.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

Nonlinear thermomechanical response and constitutive modeling of viscoelastic polyethylene membranes

Bosi

Pellegrino

2018

Mechanics of Materials

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Thin films of linear low-density polyethylene show a significant time-dependent behavior, strongly reliant on temperature and strain rate effects. A constitutive nonlinear thermo-viscoelastic relation is developed to characterize the response of thin membranes up to yielding, in a wide range of temperatures, strain rates, and mechanical loading conditions. The presented plane stress orthotropic formulation involves the free volume theory of viscoelasticity and the time-temperature superposition principle, necessary to describe non-linearities and non-isothermal conditions. Uniaxial tension tests at constant strain rate and long-duration biaxial inflation experiments have been employed in the calibration of the material parameters. The model has been implemented in the Abaqus finite element code by means of a user-defined subroutine based on a recursive integration algorithm. The accuracy of the constitutive relation has been validated against experimental data of full field diaphragm inflation tests and uniaxial tension, relaxation and cyclic experiments, covering sub-ambient temperatures and strain rate ranges observed during the operation of stratospheric balloons.

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Section: Experimental Procedures and Resultsmentioning

confidence: 99%

Nonlinear thermomechanical response and constitutive modeling of viscoelastic polyethylene membranes

Bosi

Pellegrino

2018

Mechanics of Materials

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“…DIC is a rapidly growing measuring method [28]. In recent years, some new multi-camera DIC systems that allow for the observation of samples from many sides simultaneously (e.g., a cylinder observed from all around) have been developed.…”

Section: Formulation Of the Problemmentioning

confidence: 99%

Detection of Anomaly in a Pretensioned Bolted Beam-to-Column Connection Node Using Digital Image Correlation and Neural Networks

2020

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Bolted connections, commonly applied in civil engineering structures, have many advantages. According to current trends, bolted connections in steel structures are designed as prestressed ones. Unfortunately, precise control of the prestressing forces is difficult, while the loosening (due to, e.g., dynamic interactions) may be dangerous for the entire structure. There are many control methods applied in the determination of the tightening level, among which are vision-based methods. The methods described so far enable—thanks to image processing—damage detection in connections with visible connectors. The level of the considered loosening was significant—in many cases, changes in connectors were visible with the naked eye, whereas the procedure presented here enables the detection of very small changes, impossible to detect without manual inspection of every single connector. It is not necessary to observe the connectors directly, but the near surrounding of the node should be visible. As a measurement technique, Digital Image Correlation (DIC) was used. The applied measurement method and the high sensitivity of the presented procedure makes the presented research original. The currently presented procedure, employing Artificial Neural Networks, based on the laboratory examination of an example of one selected beam-to-column connection of a two-story steel portal frame, was perfect in the detection of a change and in the determination of the number of loosened rows, 95%, and their location, 94%, with the number of false alarms below 1%.

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“…Table 1 shows the calculated spatial standard deviation and temporal standard deviation. According to References [31][32][33][34], for a DIC system with extremely well-controlled experimental noise sources, the error does not exceed 0.001 pixels, and the DIC system in a general laboratory environment does not exceed 0.01 pixels. From Table 1, it can be seen that the displacement standard deviations, both spatial and temporal, did not exceed 0.005 pixels, which is generally accepted by the DIC community as being a reasonable noise floor for typical experiments.…”

Section: Baseline Noise Of the Experimental Setupmentioning

confidence: 99%

A Correction Method for Heat Wave Distortion in Digital Image Correlation Measurements Based on Background-Oriented Schlieren

Zeng

Zhang

et al. 2019

Applied Sciences

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Digital image correlation (DIC) is a kind of displacement and strain measurement technique. It can realize non-contact and full-field measurement and is widely used in the testing and research of mechanical properties of materials at high temperatures. However, many factors affect measurement accuracy. As the high temperature environment is complex, the impact of heat waves on DIC is the most significant factor. In order to correct the disturbance in DIC measurement caused by heat waves, this paper proposes a method based on the background-oriented schlieren (BOS) technique. The spot pattern on the surface of a specimen in digital image correlation can be used as the background in the background-oriented schlieren technique. The BOS technique can measure the distortion information of the images caused by heat flow field. The specimen images taken through the heat waves can be corrected using the distortion information. Besides, the characteristics of distortions due to heat waves are also studied in this paper. The experiment results verify that the proposed method can effectively eliminate heat wave disturbances in DIC measurements.

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Introduction to Digital Image Correlation: Best Practices and Applications

Cited by 63 publications

References 0 publications

Nonlinear thermomechanical response and constitutive modeling of viscoelastic polyethylene membranes

Nonlinear thermomechanical response and constitutive modeling of viscoelastic polyethylene membranes

Detection of Anomaly in a Pretensioned Bolted Beam-to-Column Connection Node Using Digital Image Correlation and Neural Networks

A Correction Method for Heat Wave Distortion in Digital Image Correlation Measurements Based on Background-Oriented Schlieren

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