Fretting study of an impregnated graphite bearing/nitrided stainless steel in a dry contact submitted to severe thermal-vibratory loading

Zaïdi, H.; Amirat, Mohamed; Beloufa, Amine

doi:10.1177/13506501211062514

Cited by 2 publications

(2 citation statements)

References 29 publications

(67 reference statements)

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“…The experimental setup utilized is thoroughly detailed in [22,23]. Figure 1a illustrates the studied contact along with the applied mechanical stresses.…”

Section: Methodsmentioning

confidence: 99%

Friction Evolution of Graphite Bearing Impregnated with Polymer Subjected to Vibration Fretting at High Temperature

Zaïdi,

Tournis,

Deville

et al. 2024

Coatings

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To address friction and wear challenges in dry contacts, manufacturers often employ self-lubricating materials. Graphite and its derivatives stand out as particularly suitable due to their exceptional tribological properties. However, under intense friction conditions, graphite can experience a decline in lubricating efficiency due to severe abrasive wear. This abrasive damage results in elevated activated carbon surfaces with increased surface energy, fostering greater adhesion between sliding surfaces. The low friction coefficient of graphite is not an inherent property but rather a consequence of water vapor adsorption by the material. Beyond 150 °C, desorption of the vapor occurs, leading to a transition in the friction coefficient from µ = 0.1 to µ = 0.6. To address this issue, impregnation solutions for self-lubricating materials have been developed, with various compositions tailored to specific objectives. Common types include molybdenum disulfide, soft metals and polymers. In this predominantly experimental study, the impact of polymer impregnation on the evolution of friction force and wear rate in graphite material bearings subjected to a dry fretting contact under severe thermal stresses at 270 °C was investigated. Additionally, the mechanical stresses in the bearings throughout different phases of our tests were analyzed using a numerical model.

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“…The experimental setup utilized is thoroughly detailed in [22,23]. Figure 1a illustrates the studied contact along with the applied mechanical stresses.…”

Section: Methodsmentioning

confidence: 99%

Friction Evolution of Graphite Bearing Impregnated with Polymer Subjected to Vibration Fretting at High Temperature

Zaïdi,

Tournis,

Deville

et al. 2024

Coatings

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“…Although this phenomenon is difficult to observe with the naked eye, it can cause direct or indirect damage to crucial engineering components such as aviation, nuclear power, and railways. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] The characteristics of fretting damage are influenced by various parameters, including normal load, [15][16][17] displacement amplitude, 18,19 and number of cycles. 8,9,16 Among these parameters, the number of cycles is particularly critical.…”

Section: Introductionmentioning

confidence: 99%

Fretting wear characteristics evolution mechanism of 60Si2MnA steel for high-speed railway fastener clips

Zeng,

Qin,

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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The fastener clips of the high-speed railway may fracture due to accumulated fretting damage, posing a hazard to train operation safety. To investigate the evolution mechanism of fretting wear characteristics of high-speed railway fastener clips, this paper conducted fretting wear tests on 60Si2MnA steel used for clips and analyzed the fretting wear characteristics under different number of fretting cycles ( N). The results indicate that as N increases, the friction coefficient rises initially, then falls, slightly rises again, and eventually stabilizes. Furthermore, the surface wear volume and depth of 60Si2MnA steel material increase continuously, and its fretting wear mechanism undergoes a transformation. Specifically, at 20,000 cycles, surface plastic deformation primarily causes material damage. While at 40,000 cycles, an oxide plastic deformation layer appears on the material surface, where adhesive wear and oxidation wear become the primary wear mechanisms. When N increases to 80,000, plastic strain accumulates continually on the material surface, causing the oxide plastic deformation layer in the outer contact area to break and detach gradually. Adhesive wear transforms into abrasive wear, cracks occur inside the material, and fatigue wear becomes a significant wear mechanism. This study fills the research gap in the fretting wear evolution mechanism of 60Si2MnA steel.

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Fretting study of an impregnated graphite bearing/nitrided stainless steel in a dry contact submitted to severe thermal-vibratory loading

Cited by 2 publications

References 29 publications

Friction Evolution of Graphite Bearing Impregnated with Polymer Subjected to Vibration Fretting at High Temperature

Friction Evolution of Graphite Bearing Impregnated with Polymer Subjected to Vibration Fretting at High Temperature

Fretting wear characteristics evolution mechanism of 60Si2MnA steel for high-speed railway fastener clips

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