飞行器典型结构的热适配分体螺栓连接技术

doi:10.7527/S1000-6893.2020.24062

Abstract

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:

V414
TB332

TAN Zhiyong, ZHANG Zhongyuan, ZHENG Riheng, ZHAN Xujun, XU Cong. Connection technique for thermal adaptive bolts with split-piece design in typical vehicle structures[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(8): 224062-224062.

References 21

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

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