File : pdf presentation, 1.7 MB, 19 pages

Contents

Definitions for Scuffing

Characteristics of Scuffing

Historical Attempts to Define Critical Scuffing Criteria

Some Problems with Critical Scuffing Criteria based solely on Mechanics

Current Scuffing Tests Popularly Use Stepped Loading to Determine Critical Loads

Some ASTM Standards Used to Quantify Scuffing-Related Performance of Oils

ORNL’s Approach to Scuffing Measurement Case Study : Fuel Injector Plungers

Development of the ‘Pin-on-Twin’ Test

First experiments evaluated 52100 steel in #2 Diesel fuel and a low sulfur fuel (’Jet A’)

Friction Trace Comparison Method Enables Initiation to be Detected

Scuffing Map Portrays Initiation and Spread of Surface Damage on Cylindrical Plungers

New Multi-Stage Scuffing Model Includes both Lubricant and Materials Effects

Case Study II: High-Temperature Scuffing of Wastegate Bushing Materials for EGR Systems

Multiple Criteria were used to create Scuffing Severity Maps

Biodiesel Additive Issues

Summary

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