Abstract
Fretting fatigue occurs in contacting parts which are subjected to fluctuating loads and very small sliding movements at the same time. Fretting fatigue can significantly reduce the fatigue life of materials. In this investigation, a new device is introduced, which performed using a combination of a servo-hydraulic push-pull fatigue testing machine and a specially designed jig for appropriate positioning of pads. The axial and contact loads are measured by load cells. The functionality of the device is examined by making a comparison between fretting fatigue lives and plain fatigue lives of a number of ZL702A aluminum alloy specimens. The main advantages of the device are its simplicity and cheapness. It can be developed further for high and low temperature tests in future.
Highlights
Fretting is induced by vibrations or the application of bulk fatigue stresses to one or both of the contacting parts and widely occurs at the contact interface between two bodies when there is small amplitude oscillatory relative movement, such as dovetail assemblies in aircraft structures [1], [2], cables in overhead conductors [3] and mine hoist [4], riveted joints [5], prostheses [6], etc
Literature of fretting fatigue demonstrates that the fatigue load was imposed mostly by hydraulic actuator and occasionally by position control machine [7]; the contact pressure of fretting specimens is induced through the clamping pads attached to the proving ring, spring or other fretting fixtures
The system consists of three parts: the universal hydraulic fatigue testing device which produces the oscillatory axial displacement, the fretting fatigue test jig through which the pressure is transmitted by two pads to the specimen and the instrumentation
Summary
Jun Wang1,2 , Hong Xu 2, Tiexiong Su1, Huping Mao, Yi Zhang and Yangang Zhang1 1School of Materials Science and Engineering, North University of China, Taiyuan, Shanxi 030051, China 2School of Mechanical and Power Engineering, North University of China, Taiyuan, Shanxi 030051, China
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