The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Micropitting damage is one of the failure modes commonly observed in gears leading to destructive failures, which in turn results in unplanned shutdown and expensive replacement, such as those observed in wind turbine gearboxes. This study investigates gear micropitting initiation and propagation when subjected to varying torque loads under a constant rotational speed. The study employs both experimental...
A mechanism for the initiation of scuffing based on adiabatic shear instability was assessed experimentally through the measurement of dislocation densities by X-ray diffraction. Scuffing was predicted to occur when the rate of local thermal softening exceeded that of work hardening in the tribological contact. Since these rates were dependent on microstructure, the theory was tested by performing...
Scuffing failure was induced in samples of SAE 4340 steel which had been quenched and annealed at several temperatures. Examination of worn areas using grazing-incidence X-ray diffraction revealed an austenitic phase at volume fractions of up to 60%. No dependence of austenite fraction on depth was observed for depths of up to 5.0μm. No clear trend in austenite fraction after scuffing as a function...
The differences in the friction and wear behaviour of different human tooth structures against titanium have been investigated using a reciprocating apparatus containing an artificial saliva solution. The effects of enamel, enamel rod orientation, and dentin were of particular interest. A normal load of 20N, reciprocating amplitude of 500μm, and frequency of 2Hz were used. Tests lasting up to 5000...
Some potentially active heterocyclic compounds including 2-(di-n-octylaminomethyl) thiobenzoxazole were synthesized. The friction and wear behaviors of these potentially active heterocyclic compounds as additives in liquid paraffin were investigated on a four-ball machine. The tribochemical interaction between the additive and the counterface metal was explored with X-ray photoelectron spectroscopy...
Organic copper salts have been found to be effective additives for lubricating oils owing to their multifunctional performance. However, little attention has been paid to the comparative investigation of the behaviors of Cu(I) and Cu(II) organic salts as lubricating oil additives. In this paper, both Cu(I) and Cu(II) dialkyldithiophosphates were synthesized and their friction-reducing and antiwear...
This paper reports the preparation and structure characterization of dialkyldithiophosphate (DDP) modified Mo-S compound nanoclusters by a chemical method and identified by UV-Vis absorption spectra, FTIR. XPS, and 31 P NMR. Mo-S compound nanocluster as an additive in paraffin oil is found to significantly reduce wear and friction of the steel balls in a four-ball test. When the Mo/S/DDP...
Hydraulic damage tests have been carried out on five types of non-metallic coating materials in slurry water. A rotating disk test rig was used to simulate silt abrasion and cavitation erosion with natural silt at periphery speeds of 30 and 40 m s -1 . The resistances of the various coatings to silt abrasion, and the combination of abrasion and cavitation, have been measured and compared...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.