Studies of the Nature of Wear
Abstract
It was shown that spherical particles which are found in fatigue cracks of rolling contact elements, i.e. bearings and gears, are not formed in fatigue cracks generated by tranlational cyclic stress. A 'Contact Wear Machine' was developed to simulate conditions near the pitch line of gears. Test specimens are a simple cylinder and a rectangular anvil. Contact loads and the ratio of sliding motion to rolling motion may be varied. Experiments have been run using Armco 17-4 PH and EN-8 (SAE1040). Ferrograms made from oil samples taken during the experiment with Armco 17-4 contained a large number of spheres prior to the appearance of typical gear fatigue particles. The tests using EN-8 also produced typical gear fatigue particles but no spheres. The fatigue pits found on the test specimens have the same apparent morphology as those found on gears.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 28, 1974
- Accession Number
- ADA003548
Entities
People
- Douglas Scott
- John L. Middleton
- Robert A. White
- Vernon C. Westcott