Running-In of Systems Protected by Additive-Rich Oils

“…Bosman et al [33,34] used diffusion reactions to capture the growth of tribofilm on the surfaces. They proposed a new wear model that considers partial removal of the tribofilm responsible for mild wear of boundary lubricated contacts.…”

Section: Wear Predictionmentioning

confidence: 99%

Study of the Interfacial Mechanism of ZDDP Tribofilm in Humid Environment and its Effect on Tribochemical Wear; Part II: Numerical

Parsaeian

Ghanbarzadeh

Eijk

et al. 2017

Tribology International

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Relative humidity and the effect on tribochemistry and wear of boundary lubricated systems are examined experimentally in part one of this study. In part II of this study the tribofilm thickness and wear results obtained experimentally are used to develop a semi-deterministic approach to implement the effect of humidity in wear prediction of boundary lubrication for the first time. Two approaches were used for this purpose; firstly, a modification factor was found to be suitable for Archard's wear equation to be able to account for the effect of relative humidity. This factor is found to be good for engineering designers to be able to predict the lifetime of machine parts. Secondly, the effect of humidity on the tribofilm growth on the surfaces was captured in the model and its effect on wear was tested based on a recent model

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“…The same coefficient of wear was considered for tribofilm and substrate which was one of the drawbacks of the model. Another model developed by Bosman et al (30) proposes a numerical formulation for mild wear prediction under boundary lubrication systems. They suggest that chemically-reacted layers are the main mechanisms responsible for protecting boundary lubricating systems and when these layers are worn off, the system will restore the balance and the substrate will react with the oil to produce a tribofilm.…”

Section: Wear Predictionmentioning

confidence: 99%

An experimental and analytical study of the effect of water and its tribochemistry on the tribocorrosive wear of boundary lubricated systems with ZDDP-containing oil

Parsaeian

Ghanbarzadeh

Wilson

et al. 2016

Wear

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 1 An experimental and analytical study of the effect of water and its tribochemistry on the tribocorrosive wear of boundary lubricated systems with ZDDP-containing oil AbstractWater has long been recognised as a contaminant in lubricants. It can affect wear performance, especially in bearing systems, in complex ways. Water can also induce corrosion, which in turn can enhance wear. The individual parts of any tribocorrosion system are related to a complex mix of system parameters such as lubricant and additives, relative humidity and temperature. The effect of different water concentrations and different temperatures has been studied experimentally in this work. A modification to Archard's wear coefficient was applied with respect to the experimental measurements. The new wear model considering the effect of water was implemented into the previously-reported numerical model to develop a new semi-deterministic numerical wear model adapted to the tribocorrosion system in this work. IntroductionWater in lubricants has been known to be a contaminant for many systems (1-3). It is shown to affect the wear performance, especially in bearing systems, in different ways (4-10). The presence of water in lubricated tribosystems, particularly in bearing applications, can cause corrosion and hydrogen embrittlement, which can increase wear and friction (8). In addition, even small amount of water in parts per million (ppm) may accelerate the oxidation of oil (11).To investigate the effect of water contamination on the performance of lubricated systems, it is essential to know the form that water exists in the oil (12). Water can be present in oil in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 two different forms which are dissolved water and free water (13). D...

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Running-In of Systems Protected by Additive-Rich Oils

Cited by 18 publications

References 51 publications

Development of a new mechano-chemical model in boundary lubrication

Development of a new mechano-chemical model in boundary lubrication

Study of the Interfacial Mechanism of ZDDP Tribofilm in Humid Environment and its Effect on Tribochemical Wear; Part II: Numerical

An experimental and analytical study of the effect of water and its tribochemistry on the tribocorrosive wear of boundary lubricated systems with ZDDP-containing oil

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