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Research Papers: Elastohydrodynamic Lubrication

Tribo-Dynamics of Nanocomposite Grease Lubricated Point Contact Under Elastohydrodynamics Lubrication Regime

[+] Author and Article Information
Jayant Singh, Naresh Tandon

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

Deepak Kumar

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

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 25, 2018; final manuscript received September 21, 2018; published online November 1, 2018. Assoc. Editor: Wenzhong Wang.

J. Tribol 141(3), 031501 (Nov 01, 2018) (11 pages) Paper No: TRIB-18-1203; doi: 10.1115/1.4041590 History: Received May 25, 2018; Revised September 21, 2018

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 nanocomposite greases. The nanocomposite greases were formulated by dispersing different categories of nano-additives like reduced graphene oxide (rGO), calcium carbonate (CaCO3), and alumina (α-Al2O3) in bare grease (BG). The formulated nanocomposite greases are tested for film formation, frictional and vibrational response under a limited supply of greases. The use of transparent glass disk better analyses the profile of film thickness to understand the lubrication mechanism of the point contact. The microstructure of nano-additives and the formulated nanocomposite greases were characterized using high-resolution transmission electron microscopy (HRTEM). The presence of different functional groups in nano-additives and the formulated nanocomposite greases were characterized using Raman spectroscopy. The tribological contact operates under 3% and 30% slide-roll-ratio (SRR) for varying rolling speed (0.001–1 m/s) at a load of 30 N (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. The vibration level was refined to 32% with the addition of rGO nanosheets in BG. The incompatibility of α-Al2O3 with the grease structure results in disruption of tribo-dynamics behavior of the point contact.

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Figures

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Fig. 1

Schematic diagram representing the experimental setup

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Fig. 2

High-resolution transmission electron microscopy morphology of (a) BG and the developed nanocomposite greases: (b) BG + rGO (d) BG + CaCO3 and (e) BG + α-Al2O3 with their magnified views ((c), (e), and (g)), respectively [41]

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Fig. 3

Raman spectroscopy of (a) nano-additives and (b) formulated nanocomposite greases [39]

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Fig. 4

Variation of film thickness ((a), (b)) and coefficient of friction ((c), (d)) versus rolling speed (0.001–1 m/s) for BG and nanocomposite greases at 3% and 30% SRR, respectively, under inadequate supply of greases

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Fig. 5

Vibration signals for free rotating steel disk (without the contact) in accordance to the SRR at (a) 3% and (b) 30%, respectively, with the speed of 0.9 m/s. Dotted rectangular box represents low frequencies vibration signals due to disk rotation.

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Fig. 6

Vibration signals of the contact lubricated with BG and different nanocomposite greases at different speeds (0.3 and 0.9 m/s) for SRR = 3%

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Fig. 7

Vibration signals of the contact lubricated with BG and different nanocomposite greases at different speeds (0.3 and 0.9 m/s) for SRR = 30%

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Fig. 8

Resonance frequency of (a) disk without contact with ball, (b) dry point contact, point contact lubricated with—(c) BG, (d) BG + 0.4% rGO, (e) BG + 5% CaCO3, and (f) BG + 0.8% Al2O3 at 0.9 GPa

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Fig. 9

Time domain displacement signal of vibrations under 3% and 30% SRR for without contact and for the point contact lubricated with nanocomposite greases and BG samples at 0.9 m/s

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Fig. 10

Root-mean-square value of displacement signals under (a) 3% and (b) 30% SRR for without contact, bare and nanocomposite greases at different speeds (0.3, 0.6, and 0.9 m/s)

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Fig. 11

Raman spectra of rolled track on steel disk lubricated with different greases

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Fig. 12

Schematic representation of rGO nanosheets participating in the lubrication mechanism to form the physical film under EHL regime

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