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A modified form of “Unisteel” testing was adopted over 15 years ago with the basic objective of screening aircraft bearing materials and their heat treatment prior to, or as an alternative to, full-scale testing. The aim was to obtain a statistically significant quantity of data relatively quickly and relatively cheaply in comparison with full-scale rig or engine testing. The rig and its operating techniques are described with their known virtues and shortcomings as well as a description of the typical results analysis technique used. Typical comparative results obtained from a range of through-hardened materials are included to illustrate the variations obtained from different melting sources, heat treatments, and so on.
bearings, bearing alloys, failure, materials fatigue, fatigue tests, statistical analysis, bearing steels
Project development metallurgist—technology, Engine Support Laboratory, Rolls-Royce Ltd., Derby,