Film-forming properties and traction of non- functionalized polyalkylmethacrylate solutions under transition from elastohydrodynamic lubrication to thin-film lubrication

Muraki, Masayoshi; Nakamura, Kenta

doi:10.1243/13506501jet644

Cited by 16 publications

(15 citation statements)

References 29 publications

(47 reference statements)

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“…One of the authors pointed out in the previous report [14] that oil film thickness of polymer solutions at low speeds depended on the type of polymer and combination of polymer and base oil. This is probably because of changes in the rheological properties of polymer solutions.…”

Section: Discussionmentioning

confidence: 99%

“…The actual film thickness was corrected from the optical one using the RI at high pressure. The RI at atmospheric pressure was measured using an Abbe refractometer at 40 • C, and then RI at high pressure was estimated from the Lorentz-Lorenz formula [14]. The AISI 52100 steel roller was 25.4 mm in diameter in the rolling direction and its surface roughness was Ra of 4 nm.…”

Section: Measurements Of Oil Film Thicknessmentioning

confidence: 99%

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Shear behaviour of polyalkylmethacrylate solutions under thin film lubrication

Muraki

Yamashina

2011

Proceedings of the Institution of Mechanical Engineers, Part J:

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Film-forming properties and traction were determined for the oils containing polyalkylmethacrylates (PAMAs) under a temperature of 40 • C and a rolling speed between 0.001 and 1 m/s with the disc-on-roller tester. Oil film thickness measurements were made under a pure rolling condition and traction measurements were made under the slide/roll ratio of 50 per cent. All the copolymers were synthesized in the base oil by a random copolymerization method. Difference in oil film thickness between polymer solutions became significant under the rolling speed below 0.1 m/s. Among non-functionalized homopolymers, PAMAs with branched alkyl group were superior to those with linear alkyl group in film-forming performance. In functionalized PAMAs, film-forming performance was affected by the functional group as well as the coexisting alkyl group. High-mole-concentration of functional group produced a greater oil film thickness than the corresponding low-mole-concentration PAMAs. This tendency was more marked for high-molecular-weight PAMAs. Among all the polymer solutions, high-molecular-weight PAMA with methyl group as a main component showed the thickest oil film, followed by high-molecularweight PAMA containing branched alkyl group and dimethylaminoethyl group. In the low speeds of the traction-speed curves, most PAMA solutions showed the effect of friction reduction, whose extent depended upon the type of alkyl group and functional group. It was inferred that the friction behaviour in the partial elastohydrodynamic lubrication (EHL) regime was considerably affected by the friction in the thin film lubrication based on the mutual interaction between polymer molecules.

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Section: Discussionmentioning

confidence: 99%

Section: Measurements Of Oil Film Thicknessmentioning

confidence: 99%

Shear behaviour of polyalkylmethacrylate solutions under thin film lubrication

Muraki

Yamashina

2011

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Interestingly, the existence of the ordered film has been also concluded from the critical point of dynamic film [4,5,22]. Other kinds of lubricants have been utilized to explain the film thickness response to the speed in the TFL regime, such as octamethylcyclotetrasiloxane (OMCTS) [31] and polymers (f-PAMA and OCP) [81], by different researchers. The deviation from linearity of the EHL prediction at low speed has been observed in double logarithmic coordinates in most cases.…”

Section: Effect Of Rolling Speed On Tflmentioning

confidence: 99%

Thin film lubrication in the past 20 years

2016

Friction

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Thin film lubrication (TFL), a lubrication regime that fills the gap between boundary lubrication (BL) and elastohydrodynamic lubrication (EHL) regimes, was proposed 20 years ago. Since it was first recorded in the literature, TFL has gained substantial interest and has been advanced in the fields of theoretical and experimental research. Following the revelation of the TFL phenomenon and its central ideas, many studies have been conducted. This paper attempts to systematically review the major developments in terms of both the history and the advances in TFL. It begins with the description and definition of TFL, followed by the state-of-art studies on experimental technologies and their applications. Future prospects of relevant studies and applications are also discussed.

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“…The thickening of the film thickness at low speed have been then observed by several different groups. Muraki and Nakamura [58] reported the transition from elastohydrodynamic lubrication to thin film lubrication by using nonfunctionalized polyalkylmethacrylate solutions, as shown in Figure 8. Xiao et al [59] found different film forming performance under high contact pressure up to 3 GPa by using different base oil, indicating that the fluidity and molecular structure significantly affect film formation in TFL regime.…”

Section: Advances In Researchesmentioning

confidence: 99%

“…Film-forming properties of polymers (f-PAMA and OCP) in different base oil reported by Muraki and Nakamura[58].…”

mentioning

confidence: 93%

Advances in thin film lubrication (TFL): From discovery to the aroused further researches

2015

Sci. China Technol. Sci.

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Thin film lubrication (TFL) is known as a mode of fluid-film lubrication regime bridging the gap between elastohydrodynamic lubrication (EHL) and boundary lubrication (BL). Since the first recorded literature published in 1995, TFL has become one of the landmarks in the development of lubrication theory over the last twenty years. This article presents an overview of the advances in the research of TFL regime. We first begin with a brief introduction of the discovery of the phenomenon, followed by the discussion of the relevant essential aspects, such as the performing approach, theory and physical model. The state-of-the-art studies on both the theoretical and experimental fields are also presented, also latter with emphasis on the review of researches in several promising applications. thin film lubrication, film thickness, ordered structure, interface Citation:Ma L R, Luo J B. Advances in thin film lubrication (TFL): From discovery to the aroused further researches.

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Film-forming properties and traction of non- functionalized polyalkylmethacrylate solutions under transition from elastohydrodynamic lubrication to thin-film lubrication

Cited by 16 publications

References 29 publications

Shear behaviour of polyalkylmethacrylate solutions under thin film lubrication

Shear behaviour of polyalkylmethacrylate solutions under thin film lubrication

Thin film lubrication in the past 20 years

Advances in thin film lubrication (TFL): From discovery to the aroused further researches

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