Cf/Al复合材料复合编织结构T型件弯曲性能

doi:10.7527/S1000-6893.2022.27510

Abstract

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 C_f/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 C_f/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.

Key words: 3D weaving, C_f/Al composites, T-shaped parts, two-point bending, bending properties, failure mechanism

CLC Number:

V232.4

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

Figures/Tables 24

Table 1

Table 2

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Table 3

T-shaped parts precast weaving parameters

工艺	三维织物参数
织物结构	主体：三维五向；底板：叠层缝合
预制体尺寸/mm	高110~113；上长80~83；下长40~43；上宽4.6~4.7；底长80~83；底宽33.5~36.5；底高5~8
纤维体积分数/%	50
纱线规格	三维五向：不动纱6K $×$ 2股；动纱6K $×$ 3股叠层缝合：经纱6K $×$ 2股；纬纱 6K $×$ 1股

Table 3

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Fig.5

Fig.6

Fig.7

Table 4

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Fig.9

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Fig.20

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

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