Fretting Wear Volume Research Articles

Studies on fretting wear (combinations of various ceramics spheres and carbon steel plates)

In recent machine structures, more and more ceramics are employed. Thus, in present study, a fretting wear phenomenon is observed between general-purpose ceramics and carbon steel. Three kinds of spherical specimens made of alumina ceramics (Al 2O 3), zirconia ceramics (ZrO 2) and silicon nitride ceramics (Si 3N 4) are tested. Their mating pair is a flat specimen made of carbon steel for machine structure use. The fretting wear volume and fretting wear scar configuration are measured, and the worn surfaces are observed by an optical microscope.

Studies on fretting wear: influence of rubbing surface materials and some considerations

When a small tangential relative displacement is repeatedly made between surfaces to which a quasi-static normal force is applied, fretting fatigue or fretting wear are induced. There are many factors influencing these fretting phenomena. In this study, fretting wear is observed experimentally for various surface material combinations, and fretting wear volume is estimated through a newly proposed method. The influence of surface materials on fretting wear is made clear by estimating the fretting wear size, fretting wear volume and cross-sectional area configuration of the wear scar. Four plate specimen materials are used in the experiment. They are a carbon steel for machine structural use, aluminum alloy, cemented carbide and Sialon ceramics.

518 摩耗と接触応力のハイブリッド解析(OS フレッティング摩耗と疲労)

Fretting fatigue life depends on the microscopic changes on fretting surface, fretting wear, and elastic-plastic deformation of specimen and contact pad. Therefore hybrid analysis of wear and contact stress will provide more accurate and practical predicted values of fretting fatigue life and fretting wear volume. Fretting wear test was carried out for different pad lengths and contact pressures using 3.5NiCrMoV rotor material. A method of predicting wear volume in fretting fatigue was proposed in terms of wear damage parameter obtained by elastic-plastic contact and wear analysis.

F-1022 支持部にガタを有する管のカオス振動現象と磨耗(G10-2 振動解析・非線形)(G10 機械力学・計測制御部門一般講演)

As for the heat exchange machine related to energy in thermal power plants, nuclear power plants and so on, the structures with gaps are adopted due to avoiding the heat expansion damage at supports of tubes in which a fluid pass through as a heat exchange medium. Flow-induced vibrations of heat exchanger tubes are recognized as a serious problem that lead to tube damage through fretting wear. This paper presents the numerical simulation concerning the vibration behavior of cantilever beam with the collision at a gap and the fretting wear due to contact at a support when the harmonic force applies on the beam. Morover, we consider vibration behavior including the chaotic phenomenon, and the fretting wear volume.

Improving the fretting wear resistance of titanium alloy by laser beam quenching

The effects of amplitudes and normal loads on the fretting wear of titanium alloy (TC11) were experimentally investigated on a SRV fretting wear test machine in air, at room temperature and without lubrication. The wear depths were measured by a profilometer, the worn areas were observed and measured by an optical microscopy, and the micro-topographies of worn scars were studied by scanning electron microscopy (SEM). The tests and observations state clearly that the fretting wear volume (FWV) is heavily influenced by the sliding amplitude (SA) and load. In this experiment, if the SA is greater than 60 μm at a Hertzian contact stress of 105 MPa, the FWV is much greater, and SEM indicates that the wear mechanism is the combination of adhesive and contact fatigue for the above test conditions. In contrast, if the SA is smaller, the FWV is smaller too, and SEM suggests that the major wear mechanism is contact fatigue. The experiments also reveal that laser beam quenching greatly improves the fretting wear resistance of titanium alloy, especially at heavy load and large amplitude.

Research on fretting wear dependence of hardness ratio and friction coefficient of fretted couple

An investigation was performed to study the effect of the hardness ratio and the friction coefficient on the fretting wear of the tested couple. Five different alloys and four pure metals (as galvanic coatings) fretted against mild steel were tested to determine the regression relations between the fretting wear volume, hardness ratio and friction coefficient. The regression relations revealed significant correlation between the considered factors.

The influence of oil properties on the fretting wear of mild steel

An investigation was performed to study the effects of the boundary lubrication properties (measured as the sliding four-ball test welding load) and viscosity of oils on the fretting wear of mild steel. Five oils in common use and eight oils specially prepared with Vaseline and paraffin bases were tested. Regression relations among fretting wear volume, welding load and viscosity were determined. The relations revealed that the wear volume is inversely proportional to the welding load and that the quantitative influence of the oil boundary lubrication properties measured in this way on the wear volume is several times higher than the influence of viscosity. The influence of viscosity on the fretting wear volume is dependent on the oil boundary lubrication properties.

Effect of ion implantation on fatigue, fretting and fretting-corrosion of Ti6Al4V

Earlier studies of the effect of ion implantation on wear of Ti6Al4V have been extended to an examination of the effect of ion implantation on fatigue, fretting and fretting-corrosion of this alloy. Using smooth rotating-bending fatigue specimens tested in air at a frequency of 47 Hz it has been shown that nitrogen and boron implantation to doses of 2 × 10 17 ions cm −2 at 40 keV have no effect on either the S-N curves or the fatigue endurance limit. These results are in contrast to the wear test which showed that the wear behaviour of Ti6Al4V is improved by nitrogen and boron implantation. Using a Waterhouse-type test rig, fretting and fretting-corrosion of crossed cylinders have been examined at room temperature in air and sea water respectively. The applied load was 0.3 kg, the slip amplitude 40 μm and the test frequency 50 Hz. Damage was assessed quantitatively by Talysurf measurements and qualitatively by scanning electron microscopy, as a function of the number of fretting cycles. As in the case of linear wear, implantation of boron and nitrogen at 40 keV and to doses of 2 × 10 17 ions cm −2 reduces both the coefficient of friction and the fretting wear volume in both air and sea water.