単純重ね合わせ継手を用いて二重重ね合わせ継手と同一強度を得る方法について

抄録

In this study, the equivalent conditions of strength for single lap joint (SLJ) and double lap joint (DLJ) are investigated in terms of the intensity of singular stress field (ISSF) appearing at the interface end. Previous studies showed that the adhesive strength can be expressed as a constant value of critical ISSF independent of the adhesive length and adhesive thickness. In the study, first, the ISSF is investigated under the same load with varying adherend thickness. The minimum ISSF of SLJ can be obtained when the adherend thickness t₁ is large enough. Then, the equivalent conditions of strength for SLJ and DLJ is investigated by changing specimen geometry. The results show that the same strength of the DLJ in JIS (t₁ =1.5mm) can be obtained by using the SLJ with adherend thickness t₁=7mm. Since the deformation of SLJ is large, it is necessary to use the specimen with thicker adherend thickness. When the adherend thickness t₁=25mm, the strength of SLJ is nearly equal to that of DLJ.