積層構成の異なるCF/GFハイブリッド材の曲げ特性

抄録

Recently, the hybrid composites containing various carbon clothes and glass mat in polyester matrix have attracted a special interest.
This paper describes the flexural properties and the fracture behavior of the sandwich type hybrid composites in which three kinds of carbon cloth were used as facing material. These hybrid composites differ in the thickness ratio of CF part to GF part, and have the thickness from 1.68 to 4.03mm. Furthermore, the effect of thickness on the flexural strength was examined. The results obtained are as follows.
(1) In all CF-cloth/GF-mat hybrid composites, the micro buckling of carbon fiber occurred in the compression side one by one with increasing load after the proportional limit, and in this place the whitening was observed. Consequently, the stress-strain diagrams like the teeth of a saw were obtained. The ultimate fracture occurred in the tension side of CF part.
(2) The flexural strength of hybrid composites was considerably influenced by the thickness of specimen when it is under about 3.0mm, and the composite beam theory was corrected by considering such effect of thickness. However, the flexural strength of hybrid composites with more than 3.0mm in thickness could be estimated by using the common composite beam theory.