Model resin permeation of fiber reinforcements after shear deformation

Chyi Lang Lai, Wen-Bin Young

研究成果: Article

42 引文 (Scopus)

摘要

In liquid composite molding processes such as resin transfer molding and structural reaction injection molding, fiber reinforcements are formed with automated processes to conform to the complex shape of the mold cavity. Deformation of the fiber reinforcement during the forming operation can be characterized by factors such as the local surface curvature of the mold and the type of reinforcement. For bidirectional fiber fabrics, simple shear is the major deformation mode in the forming process. Deformation of the fiber reinforcement after being formed to the mold cavity shape results in variations of local fiber content. In addition, the network structure of the fiber reinforcement is also rearranged. This may cause some significant effects on the fiber permeability and result in a mold filling pattern quite different from that expected. Therefore, a good understanding and measurement of the permeabilities for the deformed fiber reinforcements is of great importance. In the flow simulation of the filling process, the success of the prediction depends greatly on the correct values of in-plane permeabilities. A change of the in-plane permeability of the fabric after shear deformation must be well understood before an accurate flow simulation can be obtained. This article investigates the permeability of fiber reinforcements in relation to different shear angles. Several flow experiments were conducted on bidirectional woven roving fabrics at different shear angles. Two relevant factors-the ratio of principal permeabilities and the direction of principal axes with respect to the orientation of the fabric-are studied to investigate their variations with respect to shear deformation of the fiber reinforcements. It is found that the angle shift of the principal axes increases with the shear angle. At the same time, the in-plane permeability ratio may decrease with the shear angle.

原文English
頁(從 - 到)642-648
頁數7
期刊Polymer Composites
18
發行號5
DOIs
出版狀態Published - 1997 一月 1

指紋

Fiber reinforced materials
Permeation
Shear deformation
Resins
Flow simulation
Fibers
Reaction injection molding
Resin transfer molding
Molding
Reinforcement
Composite materials
Liquids
Experiments

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

引用此文

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Model resin permeation of fiber reinforcements after shear deformation. / Lai, Chyi Lang; Young, Wen-Bin.

於: Polymer Composites, 卷 18, 編號 5, 01.01.1997, p. 642-648.

研究成果: Article

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