The Development of a "Pin-on-Twin" Scuffing Test to Evaluate Materials for Heavy-Duty Diesel Fuel Injectors

• Published in: Tribology transactions Vol. 50; no. 1; pp. 50 - 57
• Main Authors: Qu, Jun, Truhan, John J., Blau, Peter J., Ott, Ronald
• Format: Journal Article
• Language: English
• Published: Colchester Taylor & Francis Group 01.04.2007; Taylor & Francis; Taylor & Francis Inc
• Subjects: Applied sciences; Bench Tests; Diesel Engines; Diesel Fuels; Engines and turbines; Exact sciences and technology; Fracture mechanics (crack, fatigue, damage...); Friction; Friction, wear, lubrication; Fuel Injectors; Fuel Lubricity; Fundamental areas of phenomenology (including applications); Internal combustion engines: gazoline engine, diesel engines, etc; Lubricants & lubrication; Machine components; Mechanical engineering. Machine design; Physics; Scuffing; Solid mechanics; Steel; Structural and continuum mechanics; Surface Roughness; Tribology; Wear tests; Scuffing; Motor fuel injection; Diesel fuel; Friction stress; Bench test; Fuel Lubricity; Surface Roughness; Reciprocating movement machine; Material testing; Lubrication; Lubricity; Adhesive wear; Wear test; Rupture; Diesel engine; Steel; Experimental study; Real time; Real time system; Operating conditions; Heavy truck; Bench Tests; Diesel Fuels; Friction; Morphology; Fuel Injectors; Fuel; Internal combustion engine; Diesel Engines; Tribology
• ISSN: 1040-2004; 1547-397X
• DOI: 10.1080/10402000600943883

In order to meet stricter emissions requirements, advanced heavy-duty diesel fuel injection systems will be required to operate at higher pressures and temperatures and in fuels that have poorer lubricity. Scuffing, as a mode of failure, severely limits injector life, and new materials and processes are required to resist scuffing in these more stringent operating conditions. Consequently, there is a need to test the ability of candidate fuel system materials to resist scuffing in fuel-lubricated environments. This paper describes a pin-on-twin reciprocating wear test in which a cylindrical specimen slides, under load, across two fixed, parallel cylindrical specimens that are perpendicular to the axis of the upper sliding specimen. Cylinders of annealed AISI 52100 were tested dry and lubricated by Jet A fuel and on-highway #2 diesel fuel. The friction force was found to give a reliable real-time determination of the onset of scuffing as verified by the morphology of the wear scar. The scar width and surface roughness profiles either did not reliably detect the onset or were difficult to carry out with this geometry. *Research sponsored by the U.S. Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Office of Freedom CAR and Heavy Vehicle Technologies, under contract DE-AC05-00OR22725 with UT-Battelle LLC. Review led by Roger Melley