角部にフィレットを設けた3次元角柱突合せ継手の特異応力場解析

抄録

Our previous study showed that the adhesive strength can be expressed as a constant value of the intensity of singular stress field (ISSF) by using two-dimensional modelling. By considering the three-dimensional (3D) geometry, the mesh-independent technique proposed in our previous study is applied to evaluate the ISSF distributions along the side of butt joint interface. The results show that the critical ISSF distributions are almost the same independent of the adhesive thickness. For 3D butt joint, different singularity appears at the corner, so it is difficult to obtain the ISSF at the corner. In this study, it is shown that the ISSF at the corner can be easily obtained by considering a model with rounded corners close to the actual test specimen. Also, the influence of corner radius on the ISSF at the corner is discussed. It is found that the ISSF at the corner decreases with increasing corner radius and becomes smaller than ISSF at the center. However, as the corner radius further increases, the ISSF at the corner increases.