FRP円筒接着継手の組合せ曲げねじり荷重下における破壊挙動

抄録

In this paper the strength and the process to failure of the cylindrical adhesively bonded joints of fiber reinforced plastics have been investigated under combined bending and torsional loading conditions. Experiments were performed with an apparatus capable of applying bending and torsional moments in various proportions. From the results of the strength under combined bending and torsional loading, it was found that the failure criterion of cylindrical joints of FRP was expressed by an elliptic form equation. In order to know the extent of damage in the joint, strains and AE in this part were measured in tensile, bending, torsional and combined bending and torsional loading tests. From these results it became clear that the failure of cylindrical adhesive joints was mainly in the adhesive layer under tensile loading, while under other loading conditions damage was undergone in adherent. It was also found that the damage region in the joint was characterized by the loading conditions. It was observed that under the bending condition the central area of the joint was mainly damaged and with increase of the ratio of the torsional moment to the bending moment, the main damage area was extended to the joint end.