Studies of the Nature of Wear
Progress rept. 1 Dec 1973-30 Jun 1974
TRANS-SONICS INC BURLINGTON MA
Pagination or Media Count:
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.
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