Influence of Impact Friction in the Tightening and Loosening of screw

Abstract

As a problem of the bolted joints, loosening of screw by impact external load and over tightening force of an impact wrench are often a problem. All are impact problems and it means that it is easy to move a bolt or nut by the friction of impact. In order to contribute to research of a bolted joints, this report considers impact friction from the amount of movements of the object to impact external load, and compares with the maximum static friction.