基于高温树脂传递模塑工艺的碳纤维/聚酰亚胺复合材料连接环制备与验证

doi:10.7527/S1000-6893.2021.25438

Abstract

Abstract: A carbon fiber/polyimide composite attaching collar was designed and manufactured by high temperature Resin Transfer Mould (RTM) process according to the structural characteristics of attaching collars and the mechanical properties and forming process requirements of composite materials. The ultrasonic inspection results showed the good internal quality of the composite attaching collar. The static strength test conducted at room temperature showed that the maximum strain of the composite attaching collar is -491.0 με, indicating that the composite attaching collar maintains structural integrity under 150% ot the design load and meets the static strength design requirements. The thermo-static mechanical coupling test results at the maximum service temperature of 520 ℃ revealed that the attaching collar failed under the limit load of 118% due to the rapture of the screws at the root. The finite element analysis showed that the maximum stress of the composite attaching collar at room temperature occurred at the edge of the holes, and the primary failure mode was crushing and interlaminar shear failure around the holes. In comparison, the primary damage of the composite attaching collar at high temperature appeared at the outer thermal protection layer and the holes, which has minor influence on the structure bearing.

Key words: polyimide composite, Resin Transfer Molding (RTM), thermal structure of high-speed aircraft, thermo-static mechanical coupling test, finite element analysis

CLC Number:

TB332
V214.8

LUO Chuyang, JIANG Shengda, CHEN Mengxiong, ZHANG Peng, XIA Xufeng, CAI Peipei. Preparation and evaluation of carbon fiber/polyimide composite attaching collars based on high temperature resin transfer mould process[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(7): 625438-625438.

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Preparation and evaluation of carbon fiber/polyimide composite attaching collars based on high temperature resin transfer mould process

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