J0405-1-5 Study on static strength improvement of CFRP bolted joints by relaxing the stress concentration around bolt holes

Abstract

One of the major fastening methods for the CFRP members used in aircrafts is bolted joint. CFRP bolted joints, although, have the problem that damages are occurred around bolt holes of CFRP, even by the tightening with low fastening force. As a result, the fastening force of conventional CFRP bolted joints is very low, and these strengths become decreased. In order to improve this weakness, configurations of the washers are changed in this study to increase the fastening force without CFRP damage, and thin sheet with high friction coefficient is sandwiched between CFRP members in this study to improve the friction force. In the validation testing, the failure strength of the proposal CFRP bolted joint become higher than normal CFRP bolted joints.