ファイバー縫付機により作成した曲線状複合材の振動特性

抄録

The present study fabricates fibrous composite with curvilinear fiber shape by using tailored fiber placement machine which is an application of embroidering machine. The composite with curved fibers has variable mechanical properties depending on fiber curvature. First the relationships among fiber density, thickness and curvature are revealed by experimental study with test specimens that has various curvatures. Then, regression equations for stiffness and fiber volume fraction in terms of fiber curvature are estimated by using the mixture rule. Finally, natural frequencies and mode shapes are calculated by finite element analysis with estimated mechanical properties, and those are compared with experimental results. The present calculated results indicated better agreement with experimental results than those without estimated values. Therefore, it was found that the obtained regression equation is effective to predict mechanical behavior of composite with curvilinear fiber.