切欠きによる接着丸棒の特異応力場の低減

抄録

Failure of butt joints generally occurs at the interface edge due to the singular stress. In this study, to reduce the intensity of singular stress field (ISSF) at the interface end of a jointed round bar, the butt joint specimen with circumferential notch near the adhesive layer is used. The variation of the ISSF due to the interaction effect between the notch and the interface is investigated by the finite element analysis. The calculations show that as the adhesive layer thickness decreases, the ISSF at the interface end of the notched butt joint specimen decreases. When the adhesive layer thickness is 1mm, the ISSF of the notched butt joint specimen is reduced to half that of the unnotched specimen. In the case the adhesive layer thickness is less than 0.3mm, the compressive stress occurs at the interface end and maximum tensile stress occurs inside the butt joint. This indicates that the fracture strength of the butt joint can be improved.