Experimental investigation of fretting wear
Abstract
Fretting is a phenomenon occurring when two contacting surfaces experience small amplitude oscillatory relative motion. Fretting is of major concern as it is present in almost all machinery. Fretting may lead to complete failure of otherwise robust components. Fretting cases can be divided into two categories: fretting wear, in which damage is governed by particle detachment and fretting fatigue, in which crack propagation is the cause of failure. The purpose of this study is to experimentally investigate fretting wear phenomenon for various contacting surface pairs. A Fretting Wear Test Rig (FWTR) was designed and developed in order to conduct tests on specimens of different geometries. The fretting wear behavior of uncoated and coated specimens was studied. Images of wear scars and measurements of wear volume were used to determine the effect of motion parameters, normal pressure, amplitude of oscillation and number of cycles on fretting wear. The coatings were found to mitigate fretting wear significantly while the effect of normal pressure was more complex. A detailed factorial analysis was performed to evaluate the effects of normal pressure and amplitude on fretting wear. The results indicated that fretting wear loss varies as a combination of normal pressure and slip amplitude. It was found that fretting wear increases, reaches a peak and then reduces with increasing normal pressure. The tests on flat-on-flat contact configuration were carried out in gross sliding regime while tests on crossed-cylinder configuration were carried out in stick-slip regime. A fretting wear test rig equipped with a high speed video camera was used to observe the in-situ fretting wear phenomena for ball-on-flat contact configuration.
Degree
M.S.M.E.
Advisors
Sadeghi, Purdue University.
Subject Area
Mechanical engineering
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