ハイブリッドFRPの層間応力と疲労強度 : CFRP/GFRPによる対称積層

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Fiber reinforced plastics (FRP) are often used for structural components where the strength under repeated load is required. Especially, carbon fiber reinforced plastics (CFRP) are known to have the excellent properties of high strength and elasticity. But the weakness of CFRP is that the fracture occurs abruptly and the failure strain is small when compared with other structural materials. So, the use of hybrid lamination is gradually attracting attention as a design philosophy for improving mechanical properties.<BR>This paper reports the results of bending fatigue tests on CFRP/GFRP hybrid composites plates. The constitutions of hybrid composites are two types of GFRP (roving cloth and mat construction) and one CFRP which is a unidirectional fiber-reinforced material. The flexural strength of GFRP plates is substantially improved by CFRP lamination. A beam theory approach which predicts these flexural properties with sufficient accuracy is developed. The fractural modes of the hybrid composites are different from those of the core materials of roving cloth and mat laminated plates. The hybrid composites with roving cloth GFRP show the zigzag fracture surface and the core mat GFRP presents the brittle failure acrossing the carbon fiber direction under the plain bending loads. The fatigue properties of CFRP/GFRP hybrid composites are improved in flexural strength and rigidity. The static flexural properties depend on the constitution of GFRP cores, but core material does not influence on the fatigue properties of hybrid composites.

ハイブリッドFRPの層間応力と疲労強度 : CFRP/GFRPによる対称積層

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