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

Ma, Chang; Zeng, Zhoumo; Zhang, Hui; Rui, Xiaobo

doi:10.3390/app9183851

Cited by 10 publications

(6 citation statements)

References 33 publications

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“…The values for displacement and strain are an order of magnitude higher than what has been reported in the literature for noise values calculated at room temperature, but are in line with noise values calculated at elevated temperatures, as was the case in these tests. [14,15] F I G U R E 2 Four sample geometries were investigated in this study for testing with the electro-thermal mechanical testing ( For the measurement of surface displacement with DIC, a fine speckle pattern was produced on the surface in the area of interest using a white high-temperature paint as a background with an overspray of a black paint of the same type. This method has been shown to produce a consistent pattern with high contrast between features at elevated temperatures, which makes it ideal for this application.…”

Section: Equipment and Methodologymentioning

confidence: 99%

Optimisation of sample geometry for thermo‐mechanical testing of precipitation hardenable nickel‐based superalloys with an ETMT machine

King

Rahimi

2023

Strain

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Accurate determination of thermo‐mechanical properties in precipitation hardenable materials using an electro‐thermal mechanical testing (ETMT) system is a well‐established challenge. The non‐uniform distribution of temperature resulting from heating based on the joule effect (i.e., resistivity heating) leads to heterogeneous deformation along the gauge length, owing to the temperature dependency of mechanical properties, which makes their direct measurements complicated. This study presents an evaluation of four different miniaturised sample geometries that were tested to achieve an optimised sample with acceptable uniform strain and temperature distributions in the gauge volume. In‐situ displacement mapping, using digital image correlation (DIC), was utilised to calibrate the optimised sample dimensions with the aim of forcing the deformation to the hottest region of the gauge lengths during the tests. Tests were carried out on Inconel 718 (IN718) at 720°C, an optimal temperature for the precipitation of γ″, the primary strengthening particle in this alloy. The results showed that only in the case of the geometry proposed in this study (i.e., a sample with a short gauge length [~2 mm]) did the deformation acceptably localise at the centre, compared to other geometries. A correction methodology is developed that equates the strain measured using DIC over the 2 mm gauge length of the modified sample geometry with the strain measured using the linear variable differential transformer (LVDT) integrated to the ETMT, making future tests on IN718, and other precipitation hardenable materials, possible without the need for the use of a DIC system.

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Section: Equipment and Methodologymentioning

confidence: 99%

Optimisation of sample geometry for thermo‐mechanical testing of precipitation hardenable nickel‐based superalloys with an ETMT machine

King

Rahimi

2023

Strain

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“…High temperatures will also result in haze effects from convection currents, which distort the image and introduce error to DIC measurements. Several countermeasures (Lyons 1996, Novak 2011, Leplay 2015, Su 2015, Ma 2019, Hao 2017, Bao 2019) will be investigated to improve the accuracy of high-temperature DIC against heat distortion.…”

Section: Single Heat-pipe Test Articlementioning

confidence: 99%

DOE Microreactor Program: Summary of Experimental Capabilities Development and Activities

Sabharwall

Trellue

Hartvigsen

et al. 2021

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This document provides a summary of the experimental capabilities and activities developed and currently performed under the U.S. Department of Energy's (DOE's) Microreactor Program. These capabilities, along with other laboratory capabilities, are available to support developer and other stakeholder needs. Specific experimental capabilities described in this document include the single primary heat extraction and removal emulator (SPHERE), the microreactor agile non-nuclear experimental test bed (MAGNET), microreactor applications research validation and evaluation (MARVEL), yttrium hydride fabrication, the Hypatia critical experiment series, and a brief overview of the National Criticality Experiments Research Center (NCERC), which provides the platform to conduct experiments amd training with critical assemblies and fissionable material.

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“…In the paper entitled 'A Correction Method for HeatWave Distortion in Digital Image Correlation Measurements Based on Background-Oriented Schlieren', Chang Ma, Zhoumo Zeng, Hui Zhang, and Xiaobo Rui [19] proposed a correction method based on the background-oriented schlieren technique. The method can correct the distortion caused by heat waves in measuring image correlation.…”

Section: Compression Completion and Correctionmentioning

confidence: 99%

Special Issue on Intelligent Processing on Image and Optical Information

Yeom

2020

Applied Sciences

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

Cited by 10 publications

References 33 publications

Optimisation of sample geometry for thermo‐mechanical testing of precipitation hardenable nickel‐based superalloys with an ETMT machine

Optimisation of sample geometry for thermo‐mechanical testing of precipitation hardenable nickel‐based superalloys with an ETMT machine

DOE Microreactor Program: Summary of Experimental Capabilities Development and Activities

Special Issue on Intelligent Processing on Image and Optical Information

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