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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (6): 525453-525453.doi: 10.7527/S1000-6893.2021.25453

• Articles • Previous Articles     Next Articles

Effect of yarn size on tensile properties of 3D woven composites

LIU Zengfei1, LIU Kai2, ZHANG Binbin1, LI Xuefeng1, GE Jingran1, HUANG Jian3, LI Chao3, SUN Xinyang4, SUN Yu5, LIANG Jun1   

  1. 1. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China;
    2. School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China;
    3. Nanjing Fiberglass Research & Design Institute, Nanjing 211101, China;
    4. Department of Astronautic Science and Mechanics, Harbin Institute of Technology, Harbin 150001, China;
    5. AVIC Composite Corporation Ltd., Beijing 101300, China
  • Received:2021-03-08 Revised:2021-04-29 Online:2022-06-15 Published:2021-04-29
  • Supported by:
    National Natural Science Foundation of China (11732002, 11902030, 11802018, U20B2002)

Abstract: Systematic experiments were carried out to investigate the effect of weft yarn sizes on the mesoscopic structure and mechanical behavior of 3D layer-to-layer twill woven composites. Variations of the mesoscopic yarn structure of the composite with different weft yarn sizes were observed by optical microscopy. Tensile tests were carried out for the composite with different weft yarn sizes. The digital image correlation method was applied to obtain the surface strain field of the tensile specimens. The tensile failure mechanism of the composite was analyzed based on the fracture morphology. It is shown that with the increasing weft yarn size, the crimp ratio of warp yarns increases, the volume fraction of warp fibers decreases, and the warp tensile properties are weakened. However, with increasing weft yarn size, the crimp ratio of weft yarns decreases, the volume fraction of weft fibers increases, and the corresponding weft tensile properties are enhanced. Furthermore, the tensile stress-strain curve of 3D woven composite exhibits a significant "step" effect, which becomes more obvious with higher crimp rates of load-bearing yarns.

Key words: 3D woven composite, yarn size, mesoscopic structure, tensile testing, mechanical property

CLC Number: