Influence of step load on tribological properties of self-lubricating radial spherical plain bearings with PTFE fabric liner

Qiu, Ming; Yang, Zhuopei; Lu, Jianjun; Li, Yingchun; Zhou, Dawei

doi:10.1016/j.triboint.2017.02.047

Cited by 57 publications

(30 citation statements)

References 16 publications

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“…It can be seen that the K 0 of all these hybrid‐fabric composites increased persistently with the applied load accompanied by a gradual decrease in μ simultaneously. Increase in applied load made the contact surfaces suffer even intense compressive and shearing stresses and then induced added frictional heat and severe interfacial stress concentration . The deteriorations in resin matrix strength and fiber–matrix interfacial adhesion led to the accelerative breakage and peeling off of phenolic resin as well as fracture and pulling‐out of reinforced fibers, giving rise to a higher wear rate.…”

Section: Resultsmentioning

confidence: 99%

Combined effects of interface modification and nano‐reinforcement via nano‐enhanced interphase in hybrid‐fabric composites for tribological applications

et al. 2019

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Hybrid Nomex/PTFE (Polytetrafluoroethylene) fabric composites have demonstrated sufficient potential in tribological field due to their prominent mechanical and self-lubricating capabilities. However, the poor fabricmatrix interfacial adhesion and weak bonding of transferfilm to counterface are still the bottlenecks for practical applications of these materials. Herein, growth of ZnO nanowires onto the surface of hybrid Nomex/PTFE fabric based on air-plasma treatment was developed, aiming at enhancing the fabric-matrix interfacial performance using a mild hydrothermal method. Mechanical testing showed significant improvement in the interfacial adhesion strength, while retaining the full mechanical strength and flexibility of pristine hybrid-fabric. More importantly, the ZnO nanowires, released onto the interface during sliding process, participated in the tribo-physical actions contributing to the formation of a uniform and tenacious transferfilm. It is thought, therefore, that the ZnO-enhanced interphase has the dual effects of interface modification and nano-reinforcement of transfer-film. As a result, the tribological performance of hybrid-fabric-ZnO nanowires composites presented a considerable enhancement under varied load conditions. POLYM. COMPOS., 40:3383-3392, 2019.

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Section: Resultsmentioning

confidence: 99%

Combined effects of interface modification and nano‐reinforcement via nano‐enhanced interphase in hybrid‐fabric composites for tribological applications

et al. 2019

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“…coefficient of friction, wear loss, debris behavior). Qiu et al 7 investigated the tribological behaviors of PTFE composites under step loads. The wear loss, frictional temperature rise, and film-forming capability of the interface of tribo-pairs were affected by contact load.…”

Section: Polytetrafluoroethylenementioning

confidence: 99%

Effect of contact stress on the tribology behaviors of PTFE/316L seal pairs under various abrasive-contained conditions

Shen

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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This study focuses on the tribological characteristics of polytetrafluoroethylene rubbing against 316L stainless steel in the presence of various Al2O3 abrasive particles. The ranges of the contact stresses and abrasive sizes were 2.50–5.01 MPa and 2.0–230 µm, respectively. The evolution of the coefficient of friction, abrasive invasion behavior and damage characteristics on worn surfaces, and the transformation of damage mechanisms under different contact stresses are summarized. Results demonstrate that contact stress exerts a considerable effect on abrasive invasion behavior, the coefficient of friction trends become complicated at low contact stress. With decreasing particle sizes under a contact stress of 2.50 MPa, the wear failure changes from two-body wear to three-body wear, or two wear behaviors exist simultaneously. As contact stress increases, the wear mechanism is gradually simplified. The particle size threshold that causes the change of the wear mechanism is also gradually reduced. The wear rate of polytetrafluoroethylene has no linear relationship with abrasive size, whereas wear increases with contact stress. Under 2.50 MPa conditions, the particles easily invade the tribo-interface in the friction process, thus increasing the wear rate of the metallic counterpart. In addition, with increases contact stress, the polytetrafluoroethylene material transfers to the counterface, and local adhesion occurs. When the contact stress is increased to 5.01 MPa, polytetrafluoroethylene even shows an obvious creep.

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“…From the various influencing factors of the control strategy (e.g. weather condition, turbine location, turbine dimension, operating intensity, lubricant requirements, lubricant degradation, and previous lubrication effect) [17][18][19], the factors with relatively high influence were selected for adjustment. Finally, the final control strategy was prepared and implemented according to the actual operating data.…”

Section: Control Strategymentioning

confidence: 99%

Wind Turbine Lubrication Based on Parallel Control of Multiple Factors

Xiao-pin¹,

Liu²,

Kou³

et al. 2020

JESA

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The lubrication needs of wind turbines vary with the operating conditions. To provide a dynamic lubrication scheme for wind turbines under variable conditions, this paper designs a dynamically adjustable lubrication scheme through parallel control of multiple influencing factors. Based on mid- and long-term loads, the proposed scheme fully considers the influence of various sudden changes in addition to slowly changing factors like load, operating hours, and speed, such as to dynamically adjust the injection flow as per the specific operating condition of the turbine. The ideal lubrication effect was tracked through the adjustment of the injection flow or injection time, and used to determine the optimal dynamic lubrication control strategy during turbine operation. The proposed control strategy overcomes the defects of the traditional fixed-time fixed-flow lubrication approach, and provides reasonable on-demand lubrication schemes for wind turbines in different operating conditions. The on-demand injection of lubricant prevents under- or over-lubrication, reduces the rate of mechanical failure, and extends the service life of wind turbines. Suffice it to say that the proposed control strategy can lower power generation cost and save energy, making wind turbines more profitable.

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Influence of step load on tribological properties of self-lubricating radial spherical plain bearings with PTFE fabric liner

Cited by 57 publications

References 16 publications

Combined effects of interface modification and nano‐reinforcement via nano‐enhanced interphase in hybrid‐fabric composites for tribological applications

Combined effects of interface modification and nano‐reinforcement via nano‐enhanced interphase in hybrid‐fabric composites for tribological applications

Effect of contact stress on the tribology behaviors of PTFE/316L seal pairs under various abrasive-contained conditions

Wind Turbine Lubrication Based on Parallel Control of Multiple Factors

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