A New Approach for Determining Joint Stiffness of Bolted Joints

Abstract

Joint member stiffness in a bolted connection directly influence the safety of a design in regard to both static and fatigue loading as well as in the prevention of separation in the connection. Thus, the accurate determination of the stiffness is of extreme importance to predict the behavior of bolted assemblies. In this paper, An analytical 3D axisymmetric model of bolted joints is proposed to obtain the joint stiffness of Bolted Joints. Considering many different analytical models have been proposed to calculate the joint stiffness, the expression based force equilibrium can be a easy way to choose the best expression for the joint stiffness as a judgment criteria.

Establishment and Verification of Nonlinear Bolt Head Connection Stiffness Theoretical Model Based on Levenberg-Marquardt Method

“…In order to obtain the deformation mechanism of bolt members, Yang G et al [5] studied the prediction of member stiffness and characterization of interface contact conditions, and constructed a novel and effective finite-element model. Wang X W [6] proposed a three-dimensional axisymmetric analytical model of bolted connections to obtain the joint stiffness of bolted connections. Wei L D et al [7] systematically studied the influence of surface roughness, strength and stress of contact surface on the natural frequency of bolt structure.…”

“…In this paper, it is assumed that the angle dy/dx=0 at the root of the bolt head, and the angular deformation is 0 at the root of the bolt heads x = 0, which is substituted into equation (6). So, you can get…”