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Friction and wear performance of polyether ether ketone(PEEK)polymers in three lubrication regimes

Friction 2024年第4期12卷 670-682页

作者： Davide MASSOCCHI Nora LECIS Marco LATTUADA Davide SCAGLIA steven chatterton Paolo PENNACCHI Department of Mechanical Engineering Politecnico di MilanoMilan 20156Italy Eni SpA Downstream product R&DLombardia 20097Italy Eurobearings S.R.L. Lombardia 29016Italy

This experimental study investigates the friction and wear of three coatings commonly used in industrial applications,particularly in hydrodynamic *** three materials under investigation were Babbitt,polyether ether ketone(PEEK)reinforced with 15%carbon fibers,and PEEK reinforced with 20%carbon *** first polymer material was extruded,while the other was produced by fused deposition modelling(FDM).The materials were subjected to sliding tests in a pin-on-disc configuration,with a steel ball serving as the counter *** tests were conducted at room temperature,with a load of 10 N and under three different lubrication conditions:dry,grease,and *** linear speed was set at 0.3 m/s for the dry and semi-solid lubrication tests,while for the oil tests,the speed was set at 0.25 m/*** greases used had consistency grades of NGLI 000 and NGLI *** ISO VG 68 circulation oil was used for the oil lubrication ***,thermodynamic analyses were performed under the most severe conditions(i.e.,dry)to investigate the steel-Babbitt and steel-PEEK contact.

关键词： hydrodynamic bearings polyether ether ketone(PEEK)polymers additive manufacturing grease lubrication sliding oil lubrication ball-on-disk tribology

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Dynamic, thermal, and vibrational analysis of ball bearings with over-skidding behavior

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Friction 2023年第4期11卷 580-601页

作者： Shuai GAO Qinkai HAN Paolo PENNACCHI steven chatterton Fulei CHU Department of Mechanical Engineering Politecnico di MilanoVia G.La Masa 1Milan 20156Italy State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

The term“over-skidding”indicates that the cage rotational speed ratio exceeds the theoretical value as ball purely rolls on the *** from the skidding phenomenon that occurs in low-load and high-speed bearing,over-skidding usually occurs in large-size angular contact bearings,and it is still difficult to suppress under high load *** main forms of damage to the raceway by over-skidding are spinning and gyro *** further explore the vibration characteristics and thermal effects of this phenomenon,a set of over-skidding tests of an angular contact bearing with a bore diameter of 220 mm were conducted on an industrial-size test *** the experiment,the influence of axial load,rotational speed,and lubrication conditions on the occurrence of over-skidding were *** on a previous dynamics model,the heat generation and thermal network models were integrated in the present study to predict the over-skidding and its thermal *** model was validated in terms of the measured degree of over-skidding and temperature *** results showed that the degree of over-skidding reaches up to 12%of the theoretical value,and the friction power loss of the ball-pocket accounts for 30%of the total power *** analysis of the vibration signal showed a strong correlation between the bearing vibration characteristics and over-skidding behavior,thereby providing a way to indirectly measure the degree of over-skidding.

关键词： over-skidding vibration characteristics dynamic model power loss temperature rise

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