Article
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High-Temperature Dic Deformation Measurement under High-Intensity Blackbody Radiation
Version 1
: Received: 23 April 2024 / Approved: 23 April 2024 / Online: 23 April 2024 (12:13:29 CEST)
A peer-reviewed article of this Preprint also exists.
Han, S.M.; Goo, N.S. High-Temperature DIC Deformation Measurement under High-Intensity Blackbody Radiation. Aerospace 2024, 11, 479. Han, S.M.; Goo, N.S. High-Temperature DIC Deformation Measurement under High-Intensity Blackbody Radiation. Aerospace 2024, 11, 479.
Abstract
During the high-speed flight of a vehicle in the atmosphere, surface friction with the air generates aerodynamic heating. The aerodynamic heating phenomenon can create extremely high temperatures near the surface. These high temperatures impact material properties and the structure of the aircraft, so thermal deformation measurement is essential in aerospace engineering. This paper revisits high-temperature deformation measurement using the digital image correlation (DIC) technique under high-intensity blackbody radiation with a precise speckle pattern fabrication and a heat haze reduction method. The effect of speckle pattern on the DIC measurement has been thoroughly studied at room temperature, but high-temperature measurement studies have not reported such effects so far. We found that the commonly used methods to reduce the heat haze effect could produce incorrect results. Hence, we propose a new method to mitigate heat haze effects. An infrared radiation heater was employed to make an experimental setup that could heat a specimen up to 950 ℃. First, we mitigated image saturation using a short-wavelength bandpass filter with blue light illumination, a standard procedure for high-temperature DIC deformation measurement. Second, we studied how to determine the proper size of the speckle pattern under a high-temperature environment. Third, we devised a reduction method for the heat haze effect. As proof of the effectiveness of our developed experimental method, we successfully measured the deformation of stainless steel 304 specimens from 25 ℃ to 800 ℃. The results confirmed that this method can be applied to the research and development of thermal protection systems in the aerospace field.
Keywords
Digital image correlation; High-temperature deformation measurement; Image saturation; Speckle pattern; Heat haze effect
Subject
Engineering, Aerospace Engineering
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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