Study on effect of dimples on friction of parallel surfaces under different sliding conditions

Meng, Fanzhi; Zhou, Rui; Davis, Tiffany; Cao, Jian; Wang, Q.Jane; Hua, D. Y.; Liu, Jordan

doi:10.1016/j.apsusc.2009.11.041

Cited by 104 publications

(59 citation statements)

References 15 publications

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“…The influence of rectangle dimples with a flat bottom on the friction of parallel surfaces has been investigated experimentally and in simulations [28]. The positive effect of dimples in lowering the friction for parallel surfaces was observed over the range of larger sliding speeds, larger loads, and smoother surfaces.…”

Section: Cylinder Liner Surface Shaping Technologiesmentioning

confidence: 96%

Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

Woś

Michalski

2011

Tribol Lett

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Reciprocating piston engines are the major propulsion devices for light aircrafts, helicopters, and essentially all automotive vehicles. They are expected to fulfil both present-day and future demands for engine performance, durability, fuel economy, and exhaust emissions legislation. One of the key factors related to these demands is the need to the limit thermomechanical internal losses, wear, and lubricating oil consumption, which are in turn conditioned by the tribological behavior of the piston-cylinder assembly. Consequently, this latter system requires a multi-directional approach in terms of manufacturing. Apart from various modifying techniques (e.g. laser texturing), a conventional plateau-honing operation is still the standard technology for shaping cylinder liner surface microstructure. This paper describes the distinctions between variations in the performance of the engines in relation to cylinder liner roughness parameters due to different honing settings. Five air-cooled reciprocating aircraft engines (FRANKLIN 4A-235-B31) served as the objects of research. The engines passed durability tests on the dynamometer bed, including operation under artificially intensified wear conditions. The results show a significant impact of the brand-new honed cylinder liner surface microstructure on the engine output parameters. Detailed study proves that some of the cylinder liner roughness parameters, specifically, the slope of the root mean square line (RMS) for valley roughness Rvq and the linear triangle area for valleys A2, are strongly correlated with the engine operational properties. Higher values of Rvq and A2 are associated with an improvement in engine performance but result in a deterioration in the exhaust harmful emission.Keywords Gasoline internal combustion engine Á Engine performance Á Plateau honing Á Piston-cylinder assembly Á Cylinder liner Á Surface roughness Á Abrasive wear Á Tribological behavior Abbreviations A2Roughness profile parameter-linear triangle area for valleys (lm) CO Concentration of carbon monoxide in exhaust (%) HC Concentration of hydrocarbons in exhaust (ppm) ge Brake-specific fuel consumption (BSFC; g/kW h) Ne Engine output power (kW) Mo Engine output torque (N m) go Engine total efficiency (%) P-C Piston-cylinder Rq Roughness profile parameter-root mean square of heights (lm) Rvq Roughness profile parameter-slope of a linear regression of valley region (lm)

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Section: Cylinder Liner Surface Shaping Technologiesmentioning

confidence: 96%

Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

Woś

Michalski

2011

Tribol Lett

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“…상의 패턴을 가진 표면의 마찰, 마모 특성을 향상시키 기 위한 연구에서는 패턴의 거칠기, 크기, 형태에 따라 트라이볼로지 특성이 영향을 받는 것으로 알려져 있다 [6,7]. 의 영향을 알아보기 위해 45°로 기울어진 구조를 만들 고, 양방향으로 테스트하여 각각 45°, 135°에서 결과를 얻었다 (Fig.…”

Section: 서 론unclassified

Study on Frictional Characteristics of Sub-micro Structured Silicon Surfaces

Han¹,

Han²,

Jang³

et al. 2017

Journal of the Korean Society of Tribologists and Lubrication E

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− The understanding of the friction characteristics of micro-textured surface is of great importance to enhance the tribological properties of nano-and micro-devices. We fabricate rectangular patterns with submicron-scale structures on a Si wafer surface with various pitches and heights by using a focused ion beam (FIB). In addition, we fabricate tilted rectangular patterns to identify the influence of the tilt angle (45 o and 135 o ) on friction behaviour. We perform the friction test using lateral force microscopy (LFM) employing a colloidal probe. We fabricate the colloidal probe by attaching a 10±1-µm-diameter borosilicate glass sphere to a tipless silicon cantilever by using a ultraviolet cure adhesive. The applied normal loads range between 200 nN and 1100 nN and the sliding speed was set to 12 μm/s. The test results show that the friction behavior varied depending on the pitch, height, and tilt angle of the microstructure. The friction forces were relatively lower for narrower and deeper pitches. The comparison of friction force between the sub-micro-structured surfaces and the original Si surface indicate an improvement of the friction property at a low load range. The current study provides a better understanding of the influence of pitch, height, and tilt angle of the microstructure on their tribological properties, enabling the design of sub-micro-and micro-structured Si surfaces to improve their mechanical durability.

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“…It was shown that the adhesion of solid lubricant in the space between the dimples was provided by mechanical engagement of particles in the rough surface and by smearing the solid lubricant around the dimples. Meng et al (2010) found that the friction force for the parallel surfaces could decrease due to the dimple effect over the range of the larger sliding speed, larger load or smoother surfaces. Additionally, for the smaller sliding speed or the smaller load, the effect of the dimples on the friction force became weak, and even could be ignored.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the application of YAG laser texturing technology to the cylinder wall of auto engine

Jin

2014

Industrial Lubrication and Tribology

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Purpose -The purpose of this study was to develop a new approach using a pulse YAG laser with rational power density and pulse width to texture desired discrete distribution morphology on the cylinder wall. Design/methodology/approach -Variational rules of the effects of these three parameters were found by calculating the oil film on the cylinder/piston ring system. The experiment results were compared between laser texturing cylinders and conventional honing cylinders. Findings -It was found that the coefficient of friction and wear rate of laser texturing cylinders were reduced by 50 and 85.7 per cent, respectively, and the piston ring wear rate was decreased by 50 per cent under full lubrication condition. Under starved lubrication condition, the cylinder liner wear was reduced by 34.3 per cent. Originality/value -The effectiveness of which was determined by three control parameters: depth-to-diameter ratio, area density and distribution angle of the dimples.

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Study on effect of dimples on friction of parallel surfaces under different sliding conditions

Cited by 104 publications

References 15 publications

Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

Effect of Initial Cylinder Liner Honing Surface Roughness on Aircraft Piston Engine Performances

Study on Frictional Characteristics of Sub-micro Structured Silicon Surfaces

Investigation on the application of YAG laser texturing technology to the cylinder wall of auto engine

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