Efficiency of laser surface texturing in the reduction of friction under mixed lubrication

Braun, Daniel; Greiner, Christian; Schneider, Johannes; Gumbsch, Peter

doi:10.1016/j.triboint.2014.04.012

Cited by 247 publications

(169 citation statements)

References 22 publications

(28 reference statements)

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“…Note that the leftward shift in the Stribeck curve shown in Fig. 5 is in agreement with several previous studies of surface texture [29][30][31]. There are, however, other studies that show texture reducing friction in the full-film regime [19,32,33].…”

Section: Overall Steady-state Friction Responsesupporting

confidence: 92%

The Transient Friction Response of a Laser-Textured, Reciprocating Contact to the Entrainment of Individual Pockets

et al. 2016

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To shed light on the mechanisms with which surface texture improves the tribological performance of piston-liner contacts, we have measured the transient friction response as individual pockets pass through a reciprocating sliding contact. Tests were performed at different sliding speeds and results compared to those from a non-textured, reference specimen under different lubrication regimes. At low speed when the contact is in the boundary regime, friction force falls abruptly as each pocket leaves the contact zone, before gradually returning to an approximately steady-state value. This suggests that each pocket acts to temporarily increase the film thickness, which then decays to its non-textured value as oil is squeezed out. At higher speeds, friction is seen to reduce in a stepwise fashion, since the period between pockets being entrained is less than the time taken for the film to decay. In addition, friction results obtained when the contact is operating in the middle of the mixed regime point to a temporary film thickness collapse as the pocket enters the contact, and this agrees with recent modelling predictions. At higher speeds, the compound effect of successive pockets is to shift the contact to the right on Stribeck curve. These results imply that each pocket gives rise to an increase in film thickness that is both short-lived and small in magnitude (we estimate a few tens of nm). However, the resulting effect on friction can be significant (up to 82 % in this study) for two reasons: (1) provided the pocket frequency is sufficiently high, each successive pocket entrainment builds the film up without there being time for it to reduce back to its steady-state value; (2) when the contact is in the mixed regime, the Stribeck curve is at its steepest and friction is therefore most sensitive to film thickness changes. This has important practical implications in that pocket spacing on piston liners should be varied as a function of reciprocating sliding speed.

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Section: Overall Steady-state Friction Responsesupporting

confidence: 92%

The Transient Friction Response of a Laser-Textured, Reciprocating Contact to the Entrainment of Individual Pockets

et al. 2016

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“…Etsion et al [7][8][9] used the laser surface texturing (LST) technique to prepare different shapes of micro-dimples to improve the tribological performance of mechanical components. Braun et al [10,11] studied the tribological behavior of steel with dimples ranging from 15 to 800 µm in diameter, and found the friction reduction of 80% was possible with the optimal diameter for certain sliding speeds. Gachot et al [12][13][14] discussed the effects of surface textures under the operative lubrication regimes in the Stribeck curve, and summarized the fabrication methods and friction-reducing mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Nano Diesel Soot Particles Reduce Wear and Friction Performance Using an Oil Additive on a Laser Textured Surface

2018

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Tribological properties of nano diesel soot (DS) as an additive were investigated. Textures in linear radiating arrays were prepared on the surface of a spring-steel plate by laser radiation. The texture densities were 19.6%, 22.1%, and 44.2%, and the depth was 30 µm. The results indicated that the textured surface was interacted with additive favorably to improve its tribological performance. Friction coefficients and wear rates of textured surfaces with additive in oil were generally much lower compared to the original surface without additive. The higher area density of the textured surface with the additive in oil had the lowest friction coefficient, as low as 0.12, and also the minimum wear rate, as low as 1 × 10 3 µm/N·m in 100 • C, to be achievable. Such results can be attributed to the formation of the tribo-film and the storage function of the micro-dimple.

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“…The investigation of tactile friction on the textured surface can enhance the understanding of tactile perception, and the human-product interactions of stainless steel products will be improved [41]. Surface textures are widely applied in studies on dynamic friction to reduce the adhesive component of friction, and most of them were carried out under unidirectional sliding conditions [5,17]. However, from our previous work [39], the orientation effect has great influence on the skin friction between fingertip and textured counter-surface [39].…”

Section: Introductionmentioning

confidence: 99%

Texture Design for Reducing Tactile Friction Independent of Sliding Orientation on Stainless Steel Sheet

et al. 2017

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Surface texture is important for contact mechanical and tribological phenomena such as the contact area and friction. In this research, three different types of geometrical microstructures were designed and fabricated by pulsed laser surface texturing as semi-symmetric (grooved channel), asymmetric fractal (Hilbert curve), and symmetric patterns (grid). A conventionally finished surface as a reference sample from the same stainless steel sheet material was compared. From the experimental approach, a multiaxis force/torque transducer was used to investigate the functionality of surface texture based on measuring the tactile friction in three different sliding directions: perpendicular, parallel, and 45°to the textures. According to the dynamic friction measurements, the grid texture was indeed orientation independent. The other samples showed orientation-dependent frictional behavior, especially the grooved channel texture and reference sample. Furthermore, an analytical approach was applied to estimate the values of the friction coefficient by the pressure distribution method. From both the experimental and analytical approaches, the grid pattern was validated to be the optimal texture design in the concern of friction reduction and orientation-independent behavior.

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Efficiency of laser surface texturing in the reduction of friction under mixed lubrication

Cited by 247 publications

References 22 publications

The Transient Friction Response of a Laser-Textured, Reciprocating Contact to the Entrainment of Individual Pockets

The Transient Friction Response of a Laser-Textured, Reciprocating Contact to the Entrainment of Individual Pockets

Nano Diesel Soot Particles Reduce Wear and Friction Performance Using an Oil Additive on a Laser Textured Surface

Texture Design for Reducing Tactile Friction Independent of Sliding Orientation on Stainless Steel Sheet

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