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Journal of Composite Materials
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A New Method to Determine Fiber Transverse Permeability

Xiaoqing Wu

Composites Research Institute, Tianjin Polytechnic University, Key Laboratory Ministry of Education, Tianjin 300160, People's Republic of China; wuxiaoqing{at}tjpu.edu.cn

Jialu Li

Composites Research Institute, Tianjin Polytechnic University, Key Laboratory Ministry of Education, Tianjin 300160, People's Republic of China

R. A. Shenoi

Department of Ship Science, University of Southampton, Highfield, Southampton SO17 1BJ, UK

Improving manufacturing technology is one of the greatest challenges for the resin transfer molding (RTM) process. Permeability parameters that include in-plane and transverse permeability are important in simulation codes. Especially, through-thickness permeability is a critical parameter in the optimization of complex shaped and thick-sectioned composites. This research work presents a new method based on radial technology to determine transverse permeability. A key difference when compared to other methods is the layout of reinforcement placement. The fabric is wound and placed on the mold. The fluid flows radially into the reinforcement along the through-thickness direction. The new method avoids racetracking, and it is easy to view the flow front. The measurement of through-thickness permeability is translated into an in-plane measurement of radial technique. The through-thickness permeability for woven fabric tape and fiberglass roving is measured. The experiment shows that the width of the sample has no significant influence on transverse permeability.

Key Words: resin transfer molding • transverse permeability • radial technique • winding

This version was published on March 1, 2007

Journal of Composite Materials, Vol. 41, No. 6, 747-756 (2007)
DOI: 10.1177/0021998306067012
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