抄録
Fiber reinforced plastics (FRP) are being used for many purposes as structural materials. The special features of FRP are their lightweight, possibility of one-body plastic moulding operations and resistance of corrosion among others. But the one-body moulding operation is limited to a small size and is not suitable for making a large-size liquid tank, container or fishing boat. Therefore, in order to answer increasing demands for large-size products, the bonding structure must be incorporated with FRP.
This paper concerns with the low cycle fatigue strength of the FRP adhesive bonding structure, which are used for single lap joints. All of the joint specimens used in this investigation were glass roving cloth FRP materials bonded with epoxy-polyamides adhesive. The determinations of fatigue strength and fracture process of adhesive joints yielded the relations between static strength and fatigue strength as well as the stress-strain curves for FRP adhesive joints. Furthermore, the endurance of adhesive bonded joints were investigated on the specimens exposed to the accelerating exposed testing machine (weathering tester) for the time periods of 0, 500 and 1000 hours.
The static and fatigue strengths of the adhesive bonded joints and the life of the bonded strength were examined. The breaking surface of the bonded joints showed the interfacial fracture, which occured between the fiber and resin matrix. The exposed specimens showed higher bond strength than the unexposed standard ones. Some considerations on the design of the FRP adhesive bonded structures are also presented.
