EXPERIMENTAL STUDY OF THE ROLLING–SLIDING CONTACT CONDITIONS IN A PA66/STEEL GEAR USING TWIN-DISC TEST RIG: FRICTION AND WEAR ANALYSIS

Meftah Mbarek (), Sadok Rhaiem (), Mohamed Kharrat () and Maher Dammak ()
Additional contact information
Meftah Mbarek: Laboratory of Electromechanical Systems, National Engineering School of Sfax, Soukra Road Km 3.5, B.P. 1173, 3038 Sfax, Tunisia;
Sadok Rhaiem: Laboratory of Electromechanical Systems, National Engineering School of Sfax, Soukra Road Km 3.5, B.P. 1173, 3038 Sfax, Tunisia;
Mohamed Kharrat: Laboratory of Electromechanical Systems, National Engineering School of Sfax, Soukra Road Km 3.5, B.P. 1173, 3038 Sfax, Tunisia;
Maher Dammak: Laboratory of Electromechanical Systems, National Engineering School of Sfax, Soukra Road Km 3.5, B.P. 1173, 3038 Sfax, Tunisia;

Surface Review and Letters (SRL), 2015, vol. 22, issue 06, 1-11

Abstract: This study investigates the effects of sliding ratio on the tribological response of the contact between the teeth of a metal/polymer gear in the regions close to the pitch point. For this purpose, a new twin-disc test rig was developed on the basis of two discs of different diameters rotating one above the other at the same angular speed. Two different materials were used: non-alloyed structural steel (C45) and polyamide (PA66). The effect of the slip ratio (4%, 12%, 20% and 28%) was studied at a constant pressure of 34 MPa and a constant angular speed of 300 rpm. In addition, the contact conditions were controlled with measurements of the two discs surface temperatures. The results indicate that the wear and the friction are closely related to the contact temperature generated by the sliding phenomenon. At low slip ratio (4% and 12%), the coefficient of friction and the temperature are characterized by a quasi-linear increase with time, and the wear increases slowly. At higher slip ratio (20% and 28%), the coefficient of friction and the temperature presents a steady state, and the wear increases dramatically. During the test, a film of transferred PA66 is formed on the steel surface causing the development of adhesive interactions between the contacting discs which increase the friction coefficient and the contact temperature. The high thermal conductivity of steel as compared to that of the polymer can reduce enormously the contact temperature generated by the sliding process.

Keywords: Gear; steel; PA66; contact; slip ratio; friction; wear; temperature (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.worldscientific.com/doi/abs/10.1142/S0218625X15500742
Access to full text is restricted to subscribers

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wsi:srlxxx:v:22:y:2015:i:06:n:s0218625x15500742

Ordering information: This journal article can be ordered from

DOI: 10.1142/S0218625X15500742

Access Statistics for this article

Surface Review and Letters (SRL) is currently edited by S Y Tong

More articles in Surface Review and Letters (SRL) from World Scientific Publishing Co. Pte. Ltd.
Bibliographic data for series maintained by Tai Tone Lim ().