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research-article

Tribo-dynamics of nano-composite grease lubricated point contact under EHL regime

[+] Author and Article Information
Jayant Singh

Industrial Tribology, Machine Dynamics and Maintenance Engineering Centre (ITMMEC), Indian Institute of Technology Delhi, New Delhi 110016, India.
singhjayant11@gmail.com

Deepak Kumar

Industrial Tribology, Machine Dynamics and Maintenance Engineering Centre (ITMMEC), Indian Institute of Technology Delhi, New Delhi 110016, India.
dkumar@itmmec.iitd.ac.in

N. Tandon

Industrial Tribology, Machine Dynamics and Maintenance Engineering Centre (ITMMEC), Indian Institute of Technology Delhi, New Delhi 110016, India.
ntandon@itmmec.iitd.ernet.in

1Corresponding author.

ASME doi:10.1115/1.4041590 History: Received May 25, 2018; Revised September 21, 2018

Abstract

Friction is usually induced when the contacts are in relative motion, leading to mechanical vibration and consequently heat generation. The reduction of these undesirable parameters is possible by the application of greases, which intends to increase the service life of the bearings. The present work incorporates the frictional and vibration behaviors of concentrated point contact lubricated with bare and nano-composite greases. The nano-composite greases were formulated by dispersing different categories of nano-additives like reduced graphene oxide (rGO), calcium carbonate (CaCO3) and alumina (?-Al2O3) in bare grease. The formulated nano-composite greases are tested for film formation, frictional and vibrational response under a limited supply of greases. The use of transparent glass disc better analyses the profile of film thickness to understand the lubrication mechanism of the point contact. The microstructure of nano-additives and the formulated nano-composite greases were characterized using HRTEM (High-resolution transmission electron microscopy). The presence of different functional groups in nano-additives and the formulated nano-composite greases were characterized using Raman spectroscopy. The tribological contact operates under 3% and 30% SRR for varying rolling speed (0.001-1 m/s) at a load of 30N (Hertzian pressure, pH = 0.9 GPa). Film thickness, friction and vibration behavior were recorded to focus the tribo-performance, degree of starvation and dynamics of the tribological contact with slip varying from 3% to 30% SRR (slide-roll-ratio). The vibration level was refined to 32% with the addition of rGO nano-sheets in bare grease. The incompatibility of ?-Al2O3 with the grease structure results in disruption of tribo-dynamics behavior of the point contact.

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