A predictive modeling scheme for wear in tribometers

Hegadekatte, V.; Kurzenhäuser, S.; Huber, N.; Kraft, O.

doi:10.1016/j.triboint.2008.02.020

Cited by 102 publications

(93 citation statements)

References 34 publications

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“…The wear calculation pattern in this work shows a good agreement with experimental results and also numerical predictions reported in the literature [19,[52][53][54]. It allows the consideration of tribochemistry in predictive wear modelling and hence the investigation of the effect of different lubricant additives in reducing wear or even friction.…”

Section: Wear Calculationssupporting

confidence: 82%

Development of a new mechano-chemical model in boundary lubrication

Ghanbarzadeh

Wilson

Morina

et al. 2016

Tribology International

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Section: Wear Calculationssupporting

confidence: 82%

Development of a new mechano-chemical model in boundary lubrication

Ghanbarzadeh

Wilson

Morina

et al. 2016

Tribology International

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“…Archard's wear law, equation 2, is used extensively throughout the literature describing the relationship between the material wear volume lost in a sliding interaction, load applied, sliding distance and material hardness [22]:…”

Section: Wear Quantification and Predictionmentioning

confidence: 99%

“…The semi analytical wear model is built using information presented in [22], to which the interested reader should refer to obtain the details to perform the full implementation of the method. The model uses a combination of Hertzian contact mechanics [29] and Archard's wear law to calculate the wear over a sliding increment.…”

Section: Semi Analytical Modelmentioning

confidence: 99%

“…The mechanisms that manifest in the wear of REBs will vary and may involve adhesive, abrasive, fatigue, corrosive wear or a combination of several such mechanisms [21].As mentioned, it is unlikely that pure rolling will be exhibited in the REB system. [22] discusses the manifestation of local sliding as a result of slip in the rolling contact, in this case the ball/race contact, concluding that the majority of rolling contacts are in reality 'rolling/sliding' contacts. Sliding wear, like rolling wear, is complex and may be manifested by a number of mechanisms, including those listed above.…”

Section: Introductionmentioning

confidence: 99%

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Sliding wear analysis of cobalt based alloys in nuclear reactor conditions

McCarron

Stewart

Shipway

et al. 2017

Wear

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The study of the wear behaviour of cobalt based alloys in nuclear reactor environmental conditions is the focus of this work. The alloys are used in components within reactors due to their excellent wear and corrosion resistance and their high hardness in the high pressure and temperature water facing environment. In the nuclear reactor core, cobalt is irradiated producing a highly penetrative gamma emitting isotope, cobalt 60 from stable cobalt 59. Wear of the cobalt alloys, producing wear debris, exacerbates this problem as it may be transported and deposited at various locations throughout the primary loop increasing the potential of radiation exposure. Removing this problem will require the removal of cobalt from the system.In order for suitable replacement materials to be identified, a better understanding of the behaviour of these alloys in the prototypical working conditions must be obtained. This work focuses on two cobalt based alloys used in the ball and race components of rolling element bearings in the reactor core, Stellite 20 and Haynes 25, respectively. The sliding wear behaviour of the alloys in an environment designed to replicate reactor conditions is examined using a bespoke pin on disc tribometer. Wear measurement and microstructural and compositional analysis of the samples tested over a range of conditions are presented and discussed.Concurrent to the experimental work is the development of a wear prediction model using a semi analytical method. The model employs Archard's wear law as the method of predicting wear using data obtained through experimentation. The accuracy of the semi analytical model is limited however it does give a good estimation for maximum wear depth of the test specimens.Keywords: Sliding wear; cobalt-based alloys; contact mechanics; pin on disc; wear prediction; IntroductionCobalt-based alloys offer very good resistance to wear and chemical corrosion, and, thanks to their exceptional properties in water lubricated environments, they are often used in different bearing surfaces in nuclear applications. In reactor environments, stable cobalt-59 is bombarded with thermal neutrons producing a radioactive isotope cobalt-60 [1]. Cobalt-60 has a relatively long half-life of 5.3 years and is a penetrative gamma emitter. Wear debris generated in bearings containing cobalt-60 is transported, suspended in the coolant, becoming deposited at locations around the loop. Exposure to cobalt-60 containing wear debris, produced due to different wear mechanisms, is a leading contributor to occupational radiation exposure of maintenance personnel [2]. Therefore, in order to reduce exposure to these isotopes, a leading contributor to occupational radiation exposure, there is a trend to reduce and ultimately remove cobalt based materials to facilitate decommissioning. It is necessary to find an alternative to cobalt based alloys which has suitable tribological properties in water; this can only be achieved by exploring the tribological behaviour of these alloys for bearing applicati...

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“…L'observation par profilométrie des surfaces suite à une campagne expérimentale a montré que cette technique permettait de retrouver de manière significative le profil d'usure. Hegadekatte [9] Figure 4). Il permet de suivre l'évolution de la température macroscopique de la surface de contact au cours de l'expérience.…”

Section: Introductionunclassified