Study on Multifunctional Composites Applying Embroidery Technique

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A method to process multifunctional fiber reinforced plastic composites was established, in which objective properties or functions of the composites were optimized. Fiber paths were calculated by using an optimization method with finite element analysis, fibers were stitched to a substrate along the fiber paths with an embroidery machine, and that was impregnated with resin by the vacuum assisted resin transfer molding method. Analysis accuracy could be improved by evaluating change in material properties due to embroidery effects such as eyes of an embroidery needle and variation of fiber fraction and thickness due to variation of the fiber orientation. Moreover, fabrication methods of more multifunctional composites by using smart fibers or smart substrates were discussed, and performances of examples of such composites were evaluated.