Optical Measurement of Heated-Front-Surface Strains for Components in High Temperature Environments up to 1200 ℃

WU Dafang; WANG Huaitao; ZHU Fanghui

doi:10.21656/1000-0887.390084

Volume 39 Issue 6

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WU Dafang, WANG Huaitao, ZHU Fanghui. Optical Measurement of Heated-Front-Surface Strains for Components in High Temperature Environments up to 1200 ℃[J]. Applied Mathematics and Mechanics, 2018, 39(6): 631-644. doi: 10.21656/1000-0887.390084

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Optical Measurement of Heated-Front-Surface Strains for Components in High Temperature Environments up to 1200 ℃

doi: 10.21656/1000-0887.390084

School of Aeronautic Science and Engineering,Beihang University, Beijing 100191, P.R.China

Funds: The National Natural Science Foundation of China(11427802)

Received Date: 2017-12-11
Rev Recd Date: 2018-03-13
Publish Date: 2018-06-15

Abstract

Abstract

The external surface of a hypersonic vehicle flying in the atmosphere is facing a severe high-temperature environment due to aerodynamic heating. While in the aerodynamic thermal simulation test, the deformation measurement of heated front surface of aircraft components under high temperature conditions is extremely important and difficult. A heated-front-surface strain measurement system for hypersonic vehicle components was established, and by means of the digital image correlation method, the strain measurement for heat-resistant Al₂O₃ ceramic material with the front-surface temperature up to 1 200 ℃ was realized under the oxidizing environment. To demonstrate the correctness of the measuring method, the experimental results were compared with the calculation results from the relation between the thermal expansion coefficient and the temperature of Al₂O₃ material given by Hillman, and good agreement was obtained. The proposed 1 200 ℃ high temperature strain measurement system and the heated-front-surface strain measurement method for components under oxidation environments provide a important experimental method for the thermal strength analysis and safe reliability design of the hypersonic vehicle’s heated parts.
- high temperature environment,
- thermal strain,
- digital image correlation method,
- speckle image,
- optical measurement

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References(28)

References

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