Numerical study on tensile type bolted joints using 1700MPa class ultra-high strength bolts exciting yield at the thin shank part

Abstract

In this study, FEM was conducted to clarify the mechanical behavior and applicability of conventional design formulas for tensile type bolted joint using 1700MPa-class ultra-high-strength bolts. The 1700MPa-class bolts significantly improve the initial stiffness, the yield strength, the maximum strength and the deformation performance of tensile type joints compared to conventional high-strength bolts. Additionally, the conventional design formulas conservatively estimate the yield and maximum strength and bolt axial force of the joints using 1700MPa-class bolts.