強化繊維の主応力方向配向による積層複合材の座屈荷重向上

抄録

Variable stiffness composites induced by curvilinear reinforcing fibers have become possible to be manufactured due to improving fiber orientation technology. Since variable stiffness composites have high degree of freedom in design, it has excellent mechanical properties. In this study, In general, the metaheuristics has been used to design curved fiber shapes. However, it is extremely computationally expensive, and a simple method for designing curved fiber shapes by referring to the principal stress direction has also been proposed. In this study, the method of referring to the principal stress direction was used to improve buckling loads of fiber reinforced composites, and the performance was compared with that of an optimization method. In the present method, the forced displacement, imitating the buckling mode shape, is first applied to the composites to obtain the direction of principal stress. Then, the curved fiber shapes are determined referring to the direction of principal stresses. As a result, it was shown that the best curved shape designed by the present method has almost the same performance with those by the optimization method. In addition, the present method is less computationally expensive than the optimization method, thus is useful for efficiently improving the buckling load.