Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (12): 73-80.doi: 10.13475/j.fzxb.20200402708

• Textile Engineering • Previous Articles     Next Articles

Bending property and damage mechanism of three-dimensional woven angle interlock SiCf/SiC composites

YANG Tiantian1, WANG Ling2, QIU Haipeng2, WANG Xiaomeng2, ZHANG Diantang1(), QIAN Kun1   

  1. 1. Key Laboratory of Eco-Textiles(Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
    2. Aerospace Composites Technology Center, Beijing 101300, China
  • Received:2020-04-10 Revised:2020-07-08 Online:2020-12-15 Published:2020-12-23
  • Contact: ZHANG Diantang E-mail:zhangdiantang@jiangnan.edu.cn

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Abstract:

Targeting at the bending failure of ceramic matrix composites in service environment, the interaction mechanism between the bending stress of the composite material and the internal fibers during warp and weft bending was theoretically analyzed. Taking SiCf/SiC composite materials as an example, three-dimensional (3-D) images of internal fiber structure and pores were obtained using micro computed tomography. On this basis, the warp and weft directions of the three-dimensional woven angle interlock SiCf/SiC composite were tested respectively, and the bending damage mechanism was analyzed in the meso and micro scales. The results show that weft and warp performance of SiCf/SiC composite are significantly different, and the bending strength of the weft specimen is larger than that of the warp specimen. The bending damage modes of 3-D woven angle interlock SiCf/SiC composites are complex, in which the warp cracks mainly propagate at the warp and weft contact points, while the cracks of weft specimen mainly occur between the weft bundles, eventually leading to bending failure.

Key words: three-dimensional woven angle interlock fabric, SiCf/SiC composite, polymer Infiltration and pyrolysis, three-point bending test, damage mechanism

CLC Number: 

  • TB332

Fig.1

Three-dimensional woven angle interlock SiC fiber prefabricated component morphology. (a)SiC fiber prefabricated component(micro-CT);(b)SiC fiber prefabricated component;(c)Warp cross-section morphology; (d) Weft cross-section morphology"

Fig.2

Three-dimensional woven angle interlocking SiCf/SiC composite morphology. (a)SiCf/SiC composite; (b)Pores of SiCf/SiC composite"

Fig.3

Three-dimensional woven angle interlock SiCf/SiC composite test piece. (a)Warp direction(X-direction)specimen;(b)Weft direction(Y-direction)specimen; (c)Length of specimen;(d)Width of specimen"

Fig.4

Three-point bending test of three-dimensional woven angle interlocking SiCf/SiC composite"

Fig.5

Bending strength-displacement curves of warp (a) and weft (b) direction three-dimensional woven angle interlock SiCf/SiC ceramic matrix composites"

Tab.1

Bending mechanical properties of three-dimensional woven angle interlock SiCf/SiC composites"

试样
名称		 弯曲强
度/MPa		 弯曲模
量/GPa		 平均弯曲
强度/MPa		 平均弯曲
模量/GPa
经向-1 327.57 52.17 299.33 51.52
经向-2 268.79 48.74
经向-3 301.63 48.65
纬向-1 367.12 47.65 394.56 45.87
纬向-2 401.74 42.15
纬向-3 414.82 47.81
标准偏差 346.95±52.52 47.86±2.96

Fig.6

Bending force diagram of warp (a) and weft (b) direction of SiCf/SiC composite"

Fig.7

Damage diagram of warp SiCf/SiC composite under superfield microscope. (a)Fiber breakage and matrix crack;(b)Fiber break"

Fig.8

Damage diagram of weft SiCf/SiC composite under superfield microscope. (a)Fiber fracture and matrix crack;(b)Matrix crack"

Fig.9

Damage SEM images of warp SiCf/SiC composite under different magnification"

Fig.10

Damage SEM images of weft SiCf/SiC composite under different magnification"

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