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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2020, Vol. 41 ›› Issue (8): 224062-224062.doi: 10.7527/S1000-6893.2020.24062

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles     Next Articles

Connection technique for thermal adaptive bolts with split-piece design in typical vehicle structures

TAN Zhiyong1, ZHANG Zhongyuan1, ZHENG Riheng2, ZHAN Xujun1, XU Cong1   

  1. 1. Key Laboratory of Science and Technology on Space Physics, Beijing Institute of Near-Space Aircraft Systems Engineering, Beijing 100076, China;
    2. School of Energy and Power Engineering, Beihang University, Beijing 100083, China
  • Received:2020-04-04 Revised:2020-04-23 Online:2020-08-15 Published:2020-05-14
  • Supported by:
    Defense Industrial Technology Development Program(192ZKJ11004,JSZL2019203B003)

Abstract: The pre-tightening axial force of combined composite parts connected mechanically by high-temperature alloy bolts will be reduced in high temperature environments because of different thermal expansion coefficients between composite materials and high-temperature alloys. To overcome the difficulty of connection for hypersonic vehicles and ensure the reliability of thermal structures in high temperature environments, the connection between composite material parts and high-temperature alloy bolts is investigated in this paper. The theoretical formula of a certain type of thermal adaptive bolt with split-piece design is derived, and the consistent result is obtained by numerical model simulation. It is proved, by the typical partial end-frame test, that the residual pre-tightening axial force at high temperature can be improved effectively from about 14% to 80% at 820 ℃, under the condition that the mechanical connection strength of this new design method is the same as that of the former ordinary connection.

Key words: vehicles, strength, composite material parts, connection, high-temperature

CLC Number: