Overview of High-temperature Deformation Measurement Using Digital Image Correlation

Li, Chenzhuo; Pan, Bin

doi:10.1007/s11340-021-00723-8

Cited by 59 publications

(13 citation statements)

References 140 publications

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“…Zhang tested the coefficient of thermal expansion of tungsten specimens at 3000 • C by means of a self-developed comprehensive experimental platform [28]. Bing Pan [29] proposes a new full-frame single-camera stereo digital image correlation (stereo-DIC) technique using a single polarising camera and a polarising beam splitter, which can measure the deformation of an object's surface over a wide range of temperatures in 2020, and a review of the development of the DIC technique is presented in 2021 [30], which summarises the current challenges and the latest advances in the high-temperature DIC technique. From the aforementioned studies, it becomes evident that the use of DIC is increasingly prevalent and its applicability continues to expand into more specialized environments.…”

Section: Introductionmentioning

confidence: 99%

Design and application testing of imaging probe for strain measurement

Yu,

Cheng,

Tang

et al. 2023

J. Inst.

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To address the challenge of obtaining key device strain parameters within narrow spaces, this paper presents the design of a small-sized optical imaging probe with an independent optical system based on the basic principle of digital image correlation (DIC). To validate the strain measurement accuracy of the probe, a high-temperature heating system was built under in a laboratory setting, and experimental tests involving room temperature strain measurement and high temperature thermal expansion coefficient measurement were conducted. The findings demonstrate the potential of the developed probe for strain measurement in critical components situated in restricted spaces.

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Section: Introductionmentioning

confidence: 99%

Design and application testing of imaging probe for strain measurement

Yu,

Cheng,

Tang

et al. 2023

J. Inst.

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“…Through the continuous efforts on the key technical issues in hightemperature deformation measurement, DIC techniques have been increasingly applied for high-temperature deformation measurement of various materials and structures [8][9][10]. For example, by suppressing the thermal radiation from the heated sample and heating elements using active imaging technique (i.e., bandpass filter imaging and monochromatic lighting) [11], the applicable temperature range of high-temperature DIC methods has been extended to 2000 • C or even 3000 • C [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Ultra-Stable and Customized High-Temperature Speckle Patterns Using Air Plasma Spraying and Flexible Speckle Templates

Lu,

Yu,

Wang

et al. 2023

Sensors

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Reliable and accurate full-field deformation measurements at elevated temperatures using digital image correlation (DIC) require stable and high-contrast high-temperature speckle patterns to be prepared on the sample surface. However, conventional high-temperature speckle patterns fabricated by the existing methods possess several limitations, e.g., easily fail to preserve original pattern features due to the harsh environment and heavily dependent on the operator’s experience. In this study, we propose a reliable and reproducible high-temperature speckle fabrication method based on air plasma spraying (APS) and flexible speckle templates. This method involves covering the sample surface with pre-designed speckle templates and then spraying the melted speckle powders onto the specimen surface using an air plasma spray technique to obtain customized speckle patterns. The validity of the proposed method was verified by the speckle fabrication on both planar and curved samples and heating tests with these samples. Experimental results demonstrate that the speckle patterns made by the proposed method adhere well to the sample surface, remain stable during the heating process, and exhibit excellent agreement with the reference values in terms of the thermal expansion coefficients. The proposed method provides a reliable and efficient way to create customized and stable speckle patterns for accurate high-temperature DIC measurements.

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“…Second, if the tests are performed in challenging scenarios (e.g. non-laboratory or high-temperature DIC experiments), where the ambient light or thermal radiation of a heated sample may change drastically during the test, the deformed images may degrade greatly with apparently reduced image contrast or even destroyed with over-exposure [27]. In these cases, the camera exposure time should be adjusted dynamically according to the variations in ambient light to obtain deformed images with almost the same contrast as the reference image.…”

Section: Introductionmentioning

confidence: 99%

Automatic optimal camera exposure time control for digital image correlation

Pan¹,

Zhang²,

Yang³

et al. 2022

Meas. Sci. Technol.

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We present a method that can automatically determine the optimal camera exposure time for high-quality deformation measurement with digital image correlation (DIC) techniques. The proposed method requires to capture a series of surface images of a test sample at its reference state with different camera exposure times. The relationship between the mean intensity gradients (MIG) and average grayscales of these images reveals that the best speckle pattern quality of a speckled sample surface always corresponds to an optimal average grayscale. Thus, the proposed method can serve for two purposes in DIC practice. First, at the initial state, the camera exposure time can be adjusted automatically to obtain a reference image with best quality. Second, by adjusting the camera exposure time to make the average grayscale of an image close to the predetermined optimal value, the proposed method can adaptively output high-quality deformed images with almost constant speckle pattern quality regardless of serious ambient light variations. Experimental results demonstrated the proposed method can automatically obtain stable and high-quality speckle pattern images and thus better DIC measurement compared with regular DIC techniques using a fixed camera exposure time. The proposed method shows great potential in high-temperature DIC applications.

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Overview of High-temperature Deformation Measurement Using Digital Image Correlation

Cited by 59 publications

References 140 publications

Design and application testing of imaging probe for strain measurement

Design and application testing of imaging probe for strain measurement

Fabrication of Ultra-Stable and Customized High-Temperature Speckle Patterns Using Air Plasma Spraying and Flexible Speckle Templates

Automatic optimal camera exposure time control for digital image correlation

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