Abstract
Purpose:To increase the glass fiber content of FRP which influeces its mechanical character, the glass fiber must be compressed. An investigation has been made into the compressional behavior of a glass fiber pile and its bearing on the relation between the thickness of FRP and the forming pressure.Results:Compressional experiments on plain, satin and non-woven glass fibers have shown that a glass fiber pile is compressed by two stages. In the first stage, except under very low pressure, the thickness of the pile diminishes according to the formula log t0; =-m1; log p+b1; . In the second stage, the thickness of the pile decreases according to the formula log t0; =-m2; log p+b2;.Here m, b take different values depending on the state of the cloth and the presence or absence of uncured resin. The experiments have shown also that the relation between the thickness of the lamination and the forming pressure is p=(nθ/t) 1/m. The experiments have also led to the formula β=β1; pm as the relation between the glass fiber content and the forming pressure.
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