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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (S2): 160-169.doi: 10.7527/S1000-6893.2022.27733

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High temperature strain measurement of hypersonic aircraft carbon-based composite material structures

Dong WU, Hong YANG(), Wenfeng ZHAO, Yue LUO   

  1. Hypervelocity Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang  621000,China
  • Received:2022-06-30 Revised:2022-07-27 Accepted:2022-08-27 Online:2022-12-25 Published:2022-09-13
  • Contact: Hong YANG E-mail:yanghong@cardc.cn
  • Supported by:
    National Level Project

Abstract:

The hypersonic aircraft structures are affected greatly by thermal stress. The carbon-based composite material is widely used in the high temperature structures of the hypersonic vehicles. Therefore, it is necessary to measure and analyze the high temperature strain field for carbon-based composite material. In view of the reliable installation of strain gage on carbon-based materials and the difference of thermal characteristics of strain gage, high temperature strain measurement research was conducted for carbon-based composite material and end model. The high temperature strain measurement research for carbon-based composite material were conducted considering four kinds of strain gages installation technics including paste and spray. Validation experiments of high temperature strain measurement on carbon-based flat under high temperature flow field were also carried out. The temperature of strain measurement was up to 900 ℃. High temperature strain measurement applicable experiment for carbon-based end model was carried out in the arc heated wind-tunnel up to 850 ℃. The experimental data of carbon-based end model were analyzed and compared by the finite element method, suggesting the reliability of the experimental results. The highest compression stress of carbon-based end model was 220 MPa. The experimental results showed that stress state of carbon end model was normal.

Key words: hypersonic, thermal stress, carbon-based composite material, wind tunnel, spry

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