An Experimental Study of Micro-Dimpled Texture in Friction Control under Dry and Lubricated Conditions

Yuan, Wei; Resendiz, Jesus; Tomkowski, Robert; Liu, Xu

doi:10.3390/mi13010070

Cited by 12 publications

(8 citation statements)

References 33 publications

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“…At the same time, Wei et Al. showed that, regarding the textures obtained by laser techniques, the dominant mechanism for COF reduction may be associated with contact area reduction [37].…”

Section: Discussion and Comparisonsmentioning

confidence: 99%

Tribological behavior of micro-indented 100Cr6 steel surfaces in dry contact conditions

guglielmi,

Davoodi,

Palumbo

et al. 2024

Preprint

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The aim of the present work is to investigate the tribological behaviour in dry conditions of a 100Cr6 steel, whose surface was textured using microindentation techniques. Specifically, dimples were created on the surface of a sphere using an automatic Microhardness tester equipped with a Vickers indenter, setting a load of 0.5N. Friction tests were performed at different speeds considering surfaces with two different Void Ratios (VRs). Both textured and untextured spherical surfaces were tested using a ball-on-disc tribometer. In addition, the effect of dimple size was evaluated by producing Vickers indented surfaces at a load of 5N per each indentation, while keeping the VR values unchanged and testing the frictional properties of such surfaces at a fixed speed of 4.18 mm/s. Textured surfaces were also characterized, before and after the tribological tests, in terms of surface microgeometry and nanohardness, using a light microscope, a scanning electron microscope, an atomic force microscope, a contact profilometer and a nano-indenter. Notably, compared to the untextured samples, the microindented samples exhibited a much lower Coefficient of Friction (COF), with a friction reduction compared to the untextured case ranging from 45–65%, depending on the VR values. We noted that the adoption of large dimples allows the reduction of the COF, already at smaller VR value but, in such a case, the presence of bulges at the edge of the dimple worsens the wear resistance of the counter-surface. The local measurement of strength by nanoindentations allowed to clarify that the friction reduction is determined by the work hardening effect produced by the microindentation texturing. The proposed approach can be applied using specific tools to effectively and selectively affect the friction behaviour of components, during its use or its production (for example in stamping operations).

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“…At the same time, Wei et Al. showed that, regarding the textures obtained by laser techniques, the dominant mechanism for COF reduction may be associated with contact area reduction [37].…”

Section: Discussion and Comparisonsmentioning

confidence: 99%

Tribological behavior of micro-indented 100Cr6 steel surfaces in dry contact conditions

guglielmi,

Davoodi,

Palumbo

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Wei et al also tested dimpled surface structures. According to their findings the higher dimple density results lower coefficient of friction, even though in both lubricated and dry conditions the textured samples performed better [46].…”

Section: The Tribological Effects Of Different Shapesmentioning

confidence: 97%

A Review on Friction Reduction by Laser Textured Surfaces in Internal Combustion Engines

et al. 2022

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The internal combustion engine will be required as a bridge-technology in the upcoming decades to achieve a significant reduction in local emissions in the mobility, and logistics sector. Alternative fuel technologies will present new mechanical engineering challenges, including increasing efficiency and reducing mechanical losses. Textured surfaces with appropriate manufacturing parameters can enhance lubrication, and reduce friction in sliding and rolling contacts, e.g., journal bearings, or the piston ring -cylinder subsystem. This paper gives an overview of 80 scientific works related to laser surface technologies, with an emphasis on surface texturing for friction reduction from the viewpoint of engine development. The most common texture types, further directions, and general challenges are highlighted in the summary.

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“…Reasonable surface texture can significantly minimize friction and wear on the end face. [4][5] , reduce the friction coefficient [6] , reduce the friction pair's temperature [7] and increase bearing capacity [8] .…”

Section: Introductionmentioning

confidence: 99%

Analysis of Contact Characteristics of Rough Surface/Microporous For Flat Friction Pair

Ahmat²,

Zhang³

et al. 2023

J. Phys.: Conf. Ser.

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The rough surface has serious friction, wear and thermal damage during the sliding friction process in engineering applications, which leads to the failure of the friction pair. The rough surface contact is simplified into a rough surface with fractal properties and an ideal plane. The interaction between the asperities of the contacting body and the coupling effect of frictional heat flow at the frictional interface is considered. The impact of contact pressure and temperature rise between microporous model and non porous model on rough surface was compared, as well as the impact of Sa on the area, contact pressure and temperature rise of the friction pair. The results show that in the process of uniform sliding friction, when the asperities pass through the micropores, the asperities are embedded in the edge of the micropores so that the peak contact pressure increases, cutting occurs, and the deformation is affected by the interaction between the micropores and the asperities. The position of the highest pressure point is not fixed due to the deformation of the asperity, which improves the force of the asperity, and the micro-hole reduces the contact zone, thereby reducing the contact of the asperity and the pressure extreme point and reducing the pressure.Micropores reduce the temperature and enhance the wear condition of the end face. Small surface roughness can decrease the risk of end face wear.

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An Experimental Study of Micro-Dimpled Texture in Friction Control under Dry and Lubricated Conditions

Cited by 12 publications

References 33 publications

Tribological behavior of micro-indented 100Cr6 steel surfaces in dry contact conditions

Tribological behavior of micro-indented 100Cr6 steel surfaces in dry contact conditions

A Review on Friction Reduction by Laser Textured Surfaces in Internal Combustion Engines

Analysis of Contact Characteristics of Rough Surface/Microporous For Flat Friction Pair

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