Effects of the Interlayer Toughening Agent Structure on the Flow Behavior during the z-RTM Process

Weidong Li, Gang Liu, Jianwen Bao, Shuhua Dong, Xiaolan Hu, Xiaosu Yi, Zhitao Lin

Research output: Journal PublicationArticlepeer-review


In this paper, interlayer toughening composites were prepared by the z-directional injection RTM process (z-RTM), which has the advantage of increasing the interlaminar toughness and short-ening the filling time and completely impregnating the fibers. The nonwoven fabrics and dot matrix structure material were used as ex situ interlayer toughening agents. The effect of the interlayer toughening agent structure on the resin flow behavior during the z-RTM process was investigated. The macro-flowing and micro-infiltration behaviors of the resin inside the preforms were deduced. The permeability of the fabric preforms with different toughening agents was investigated. The results show that the introduction of the nonwoven structure toughening agent makes the macro flow slow, and the flow front more uniform. The toughening agent with a dot matrix structure promotes the resin macro flow in the preforms, and shortens the injection time. The z-directional permeability of the preform with a dot matrix structural toughening agent is one order of magnitude lower than that of the non-toughened preform, while being higher than the preform toughened by the nonwoven fabric preforms, which is helpful for the further applicability of the z-RTM process. Furthermore, the mode II interlaminar fracture toughness of composites was evaluated.

Original languageEnglish
Article number3265
Issue number9
Publication statusPublished - 1 May 2022
Externally publishedYes


  • ex situ toughening
  • fabric preforms
  • permeability
  • resin flow
  • z-RTM process

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics


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