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Technical Briefs

Repeatability Estimation in Galling Resistance Testing

[+] Author and Article Information
Scott R. Hummel

Department of Mechanical Engineering, Lafayette College, Easton, PA 18042hummels@lafayette.edu

Jeffrey Helm

Department of Mechanical Engineering, Lafayette College, Easton, PA 18042helmj@lafayette.edu

J. Tribol 132(4), 044504 (Oct 01, 2010) (5 pages) doi:10.1115/1.4002504 History: Received April 28, 2010; Revised August 19, 2010; Published October 01, 2010; Online October 01, 2010

Galling is a severe form of mechanical surface damage, commonly observed in metals, that is accompanied by adhesive transfer, extensive plastic deformation, and/or cold-welding of the mating surfaces. It can lead to seizure or rapid failure of machine components. Stainless steels are particularly prone to galling. A new galling test and analysis method that reflects the statistical nature of galling is described. The new ASTM method (G196), which embodies a probabilistic approach to galling, is superior to an older ASTM test method (G98), which produces only a single threshold stress for a given combination of materials. A computer-modeled experiment involving a 300 series stainless steel is used to illustrate how the enhanced analysis can be applied to determine the repeatability of galling test results.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 2

Typical galling frequency results along with three inset binomial distributions at various π values, where π is the galling frequency

Grahic Jump Location
Figure 1

Schematic diagram of the ASTM G196 test method

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