Abstract
This study is about the effect of the localized slip to the looseness behavior of CFRP / metal flat plate fastener. In recent years, because of its high stiffness and strength per weight, CFRP becomes applied to large-scale structure. To fastening the CFRP to the large-scale structure, mechanical fastening method like bolt nut joint is desired because of ease of the maintenance. Since compressive strength of the CFRP is low, to prevent the compressive damage, fastening force is set up to low value. Therefore, it is easy to break at around the bolt holes because of the fastening holes side contact. Then in this research, to elongate number of cycle before the hole side contact, experimental observation about under several fastening force condition was conducted. From the observation, effect of the fastening force to the early stage of the loosening process and whole process was examined.
