等曲げ剛性を有するGRP, CRPプリプレグシート積層板の疲労特性

抄録

Fiber reinforced plastics (FRP) are widely used in many fields because of their characteristics achived by the combination of fibers of high strength and elasticity and excellent matrix. In this paper, a fundamental investigation was made to develop light weight composite materials with excellent spring properties from hybrids of glass/epoxy and carbon/epoxy laminates. As a result, the CRP/GRP hybrid structure was found to be superior in fatigue properties to any other GRP laminates. In this structure, fracture took place stepwise in slow motion. Furthermore, the relation between the flexural rigidity of the hybrid laminates and the spring constant was calculated using the number of plies as the structural factor of laminates. The result agreed with the experimental value. Therefore, it was confirmed that the CRP/GRP hybrid structure shows the excellent spring properties and can be used for a long time in a wide elastic region.