Abstract
The processability of woven glass fabric-reinforced composite plates by three-dimensional stamp-forming into spherical caps is theoretically considered from a geometrical point of view before and after the deformation process. For doing this, tensile properties of the material were measured under similar heat conditions as in the relevant stamp-forming process. Stretch in the fibre direction was found to be smaller than the maximum elastic extension of the glass fibres. Reduction of the angle between the crossing fibres was quite large when the satin woven fabric composite was pulled in the 45° direction. In theory, the material is assumed to attain maximum stretch along the meridian in the fibre direction on the formed dome. The curve in the flat plate before the deformation process, which will be formed into a parallel of latitude of the dome after stamp-forming, is obtained by an iteration scheme on the condition that the deformed length of the curve is equal to the circumferential length of the curve of constant latitude. A possible deformation of the spherical dome without serious wrinkling is obtained. The flexibility of the satin woven fabric composite material is found to be sufficient for the plate to be formed into a hemisphere, as long as the working condition is well controlled. A possible working condition during the stamp-forming is proposed.
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