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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2021, Vol. 42 ›› Issue (2): 424918-424918.doi: 10.7527/S1000-6893.2020.24918

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Experimental study on behavior of delamination propagation of carbon fiber/bismaleimide composites during integral forming process

WANG Xueming1, XIE Fuyuan2   

  1. 1. Composite Test Technology Center, AVIC Composite Corporation LTD, Beijing 101300, China;
    2. Institute of Industrial and Equipment Technology, Hefei University of Technology, Hefei 230009, China
  • Received:2020-10-23 Revised:2020-11-20 Published:2020-12-08
  • Supported by:
    Innovation Funding from AVIC Composite Corporation LTD (GC732011601)

Abstract: To overcome the problem of frequent delamination in the autoclave process of composite components, the influence of temperature in integral forming process on delamination propagation, toughness of QY8911 bismaleimide matrix and toughness of mode Ⅰ interlaminar fracture toughness of T300/QY8911 laminates were investigated. The path of delamination propagation and the failure mode of fracture surface in the integral forming process of composites were analyzed according to the morphology of delamination propagation section. The optimization measures for integral forming process and structural design of composites were also given. The results show that with the increase of the highest temperature of the integral forming process, delamination propagation increases, the tensile strength and modulus of QY8911 bismaleimide matrix decrease gradually and the GⅠC of T300/QY8911 laminates increase gradually. SEM analysis of the delamination propagation section shows that delamination propagates along the interlaminar crack of laminates, and there are two failure modes in the delamination propagation section: matrix fracture and matrix/fiber interface debonding. Mode Ⅰ interlaminar fracture is a typical microscopic characteristic of delamination propagation in the integral forming process of composites.

Key words: composite, delamination, co-bonding, secondary bonding, integral forming process

CLC Number: