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Measurement of the Three-Dimensional Permeability of Fiber Preforms Using Embedded Fiber Optic Sensors

Department of Aeronutics and Astronautics, Stanford University, Stanford, CA 94305

Woo Il Lee

Department of Aeronutics and Astronautics, Stanford University, Stanford, CA 94305

George S. Springer

Department of Aeronutics and Astronautics, Stanford University, Stanford, CA 94305

An experimental technique is described which can be used to measure simultaneously the three principal permeabilities of fiber reforms made of continuous or short fibers. The technique utilizes embedded optical fibers for detecting the position of the liquid front inside the reform. Expressions were derived for calculating the permeabilities from the three-dimensional measurement of the liquid front. Permeabilities measured by the present fiber optic and by the conventional, pressure drop and flow visualization techniques were compared. Good agreements were found between the results of these techniques.

Journal of Composite Materials, Vol. 29, No. 6, 714-733 (1995)
DOI: 10.1177/002199839502900602


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