Al-FRP円筒接着継手のねじり強度

抄録

In the present study, the strength of adhesively bonded Al-FRP cylindrical joints under torsional moment was investigated. In the experiments, Al-GFRP and Al-CFRP joint specimens were tested. And for the Al-CFRP joints, three kinds of specimens having different bonded areas were prepared. These specimens were used in order to investigate the effect of the variation of bonded area on the torsional strength. For the stress analysis of the joints, an elastic-plastic FEM program was made. Accuracy of this FEM program was confirmed by comparing the results calculated by the program with the experimental data on the distribution of strain at the surface of the bonded part. And the distribution of stress in the adhesive layer at the breaking load was examined. The followings were made clear from the results of this study.
(1) Both Al-GFRP and Al-CFRP joints had the same torsional strength.
(2) The fracture torsional moment of the joints increased with the bonded area and the mean shear strength at the adhesive layer decreased with increasing bonded area.
(3) The adhesive yielded mainly at one side of the edge of the adhesive layer at the breaking load. The area of high stress in the adhesive layer was one-sided. And the area of low stress in the adhesive layer expanded with increasing bonded area.
(4) Maximum equivalent plastic strain and plastic area at the edge of the adhesive layer increased linearly with the bonded area.