Abstract
Machines and structures are generally constructed with many parts and the bolted joint is often used to joint some parts. The static property of the jointed part was relatively well proved, for example, Rotscher cone of influence, while the dynamic property has not been cleared yet. In this study, a simple model of bolted joint with high accuracy was proposed by using the finite element method. The object was a set of frame structures and they were jointed by tap bolts or through bolts. In the finite element model, the bolt axis, bolt head and nut were modeled by beam elements and rigid ones to construct a simple finite element model. The first natural frequency was measured by impact test and the fixation area of the contact surface in the finite element model was adjusted to agree the calculated natural frequency with the measured one.
