Material Engineering and Mechanical Manufacturing

Bending properties of composite braided structure T⁃shaped parts of Cf/Al composite material

  • Zhiwen LI ,
  • Changchun CAI ,
  • Huan YU ,
  • Zhifeng XU ,
  • Zhenjun WANG ,
  • Rongxing LI
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  • National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang  330063,China
E-mail:yuhuan@163.com

Received date: 2022-05-24

  Revised date: 2022-06-22

  Accepted date: 2022-07-21

  Online published: 2022-07-25

Supported by

National Natural Science Foundation of China(52165018);Aeronautical Science Foundation of China(2019ZF056013);Jiangxi Provincial Natural Science Foundation(20202ACBL204010)

Abstract

Taking the typical structural T-shaped parts of aero-engine as the research object, the preform of T-shaped parts was braided with three-dimensional five-dimensional (vertical plate) and laminated stitched (bottom plate) composite structures, and the composite braided structure T-shaped parts of Cf/Al composite material were formed by vacuum pressure infiltration method. Two-point bending experiments at room temperature and 350 ℃ were carried out to explore the bending properties of composite T-shaped parts at different temperatures, and the microstructure characteristics, bending load-displacement curves, fracture morphology and failure mechanism of T-shaped parts were analyzed. The results show that there is no obvious defect in the microstructure of three-dimensional composite braided structure T-shaped parts of Cf/Al composite material, and the stitching of the two braided structures is complete. At room temperature, the average bending strength of T-shaped parts is 384.2 MPa and at 350 ℃, the average bending strength is 204.6 MPa. The bending load-displacement curves at room temperature and 350 ℃ show nonlinear characteristics, and there are linear elastic stage, plastic deformation stage and failure unloading stage. After the bending failure, there is no fragmentation and fracture, and the structural integrity is still maintained. However, the root is stitched by two different braided structures and the root fillet exists, it is easy to produce stress concentration in the root, so that the failure part is concentrated in the root.

Cite this article

Zhiwen LI , Changchun CAI , Huan YU , Zhifeng XU , Zhenjun WANG , Rongxing LI . Bending properties of composite braided structure T⁃shaped parts of Cf/Al composite material[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(10) : 427510 -427510 . DOI: 10.7527/S1000-6893.2022.27510

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