Twin disc micropitting tests
TL;DR: In this paper, the effect of surface roughness, lubricant type and surface treatment on micropitting performance of two case hardening steels was investigated. And the test results showed that the roughness of the gear has a major impact on the microphitting performance.
About: This article is published in Tribology International.The article was published on 2009-10-01. It has received 43 citations till now. The article focuses on the topics: Micro pitting.
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TL;DR: In this paper, a two-disk rolling contact fatigue test methodology was employed to investigate the impacts of various parameters on micro-pitting performance of lubricated point contacts of rough surfaces.
64 citations
Cites methods from "Twin disc micropitting tests"
...[7] performed the fatigue tests using a twin-disk machine to study the influences of different steel materials, surface roughness amplitudes, surface treatments (surface hardness and coatings) as well as lubricants on micro-pitting....
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TL;DR: In this article, the formation of micropitting, pitting and their sequence is studied with numerical results based on stress field, especially shear stress, by taking into account the high shear tractions caused by local asperity friction.
62 citations
TL;DR: In this article, the experimental results involving material ultimate tensile strength, yield strength, creep behavior, total fracture strain, reduction in the area as well as Charpy impact energy were presented at room temperature and at elevated temperatures.
33 citations
TL;DR: In this paper, surface topography measurements from spur gears produced using four different manufacturing methods were used as input to a contact analysis program, and the results showed that the surface topology caused by the manufacturing methods has a large influence on the real contact area in the early life of the gear.
29 citations
TL;DR: In this article, the influence of various parameters on the resistance to micropitting of steel discs was investigated on a twin-disc machine, and the effect of surface roughness and material properties on the surface resistance to pitting was discussed.
Abstract: An experimental study was carried out on a twin-disc machine to study the influence of various parameters on the resistance to micropitting of steel discs. The slide-to-roll ratio (SRR = sliding speed/mean rolling speed) was shown to have a great influence on surface-initiated pitting, which occurs even for low sliding speeds. Metallographic studies revealed the disadvantages of atmospheric pressure heat treatments compared to low-pressure ones: discontinuities such as oxides under the surface favor crack propagation. The load applied on the discs—and thus the contact pressure—did not affect the micropitting of the surfaces in the range studied. The effects of surface machining and surface treatments were finally considered: ground surfaces showed better resistance to micropitting than surfaces obtained by turning, and the benefits of shot peening were exposed. The influence of surface roughness and material properties on the resistance to pitting is discussed in the light of these results.
27 citations
References
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TL;DR: In this paper, the results of amorphous hydrogenated carbon films (a-C:H) and hydrogen-free hard carbon (aC:C) are reported in terms of their tribological performance in dry, water and oil-lubricated conditions.
228 citations
TL;DR: In this article, the influence of oil temperature on gear failure modes, as well as their introduction into load carrying capacity calculation methods are shown. But the often-applied practice of increasing the severity of a gear oil test method by increasing the oil temperature has to be revised.
126 citations
TL;DR: In this paper, a factorial experimental design was adopted to assess the influence of seven factors: material, surface finish, lubricant, load, temperature, speed and slide-to-roll ratio.
116 citations
01 May 2002
TL;DR: In this paper, a simple estimate of the thickness of the lubricating film in a typical pair of spur gears is presented on the basis of classical smooth-body isothermal, elastohydrodynamic lubrication theory.
Abstract: The lubrication of gear teeth is reviewed including some key aspects of recent theoretical research and current practice. A simple estimate of the thickness of the lubricating film in a typical pair of spur gears is presented on the basis of classical smooth-body isothermal, elastohydrodynamic lubrication theory. The deficiencies of this simple calculation are then discussed; these include roughness, friction, churning, starvation and contamination, all common features of practical gearing. Three simple methods are described for estimating the tooth temperature and its consequent effect on film thickness.
47 citations
TL;DR: In this article, the performance features of a new generation of industrial gear oils, developed for both mineral and synthetic base oils, were reviewed and compared with conventional commercial products and the extensive rig and field-testing used to confirm their performance.
Abstract: This paper reviews the performance features of a new generation of industrial gear oils, developed for both mineral and synthetic base oils. These new products were designed to provide the highest levels of protection against the relatively new wear mechanism called micropitting. However, great stress was placed on providing these new products with balanced performance capabilities, so that they will perform with high reliability in the wide variety of conditions to which modern industrial gear oils are exposed. Performance areas such as filterability, foam control, corrosion protection, water separation, oxidation control and bearing protection were of particular concern. This paper compares the overall performance of these new technologies with conventional commercial products and it describes the extensive rig and field‐testing used to confirm their performance. It also reviews the phenomenon of gear micropitting and optimum methods for its assessment.
36 citations