Session: DFMLC-04-01: Design for Manufacturing , Assembly and Product Service Systems

Paper Number: 68219

Start Time: August 19, 10:00 AM

68219 - Viscous Friction Effect During the Process of Tightening and Loosening of Bolted Joints 

Bolted connection is one of the most widely used form of mechanical connection because of its easiness of the installation and disassembly. Research of bolted joints mainly focuses on two aspects: high precision tightening and improvement of anti-loosening performance. The under-head bearing friction coefficient and the thread friction coefficient are the two most important parameters that affect the tightening result of the bolted joint, and they are also the most important parameters that affect the anti-loosening performance of the bolted joint. Coulomb friction model is a commonly used model to describe under-head bearing friction and thread friction, which considers the friction coefficient as a constant independent of normal pressure and relative sliding velocity. In this paper, the viscous effect of the under-head bearing friction and thread friction is observed by measuring the friction coefficient of bolted joints. The value of friction coefficient increases with the increase of the relative sliding velocity and the decrease of the normal pressure. It is found that the Coulomb viscous friction model can better describe the friction coefficient of bolted joints. Taking into account the viscous friction effect, the loosening prediction model of bolted joints is modified. The experimental results show that the Coulomb viscous friction model can better describe the under-head bearing friction coefficient and thread friction coefficient, and the model considering the viscous effect can more accurately predict the loosening characteristics of bolted joints.

Presenting Author: Qingyuan Lin Shanghai Jiao Tong University

Authors:

Qingyuan Lin Shanghai Jiao Tong University
Yong Zhao Shanghai Jiao Tong University
Qingchao Sun Dalian University of Technology
Kunyong Chen Shanghai Jiao Tong University