This article documents the metallurgical evaluation of a rolling element bearing that failed due to electrical discharge damage. This rolling element bearing was used in a helicopter turbine engine that failed in-flight, resulting in a hard landing of the helicopter. Optical and electron microscopy as well as energy dispersive spectroscopy were used to evaluate the bearing. Pitting and material transfer on the external bearing races bearing and mating surfaces revealed that the electrical discharge damage occurred while the engine’s components were not rotating.
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Sur ScienceDirect.com un cas concret d’analyse de défaillance de vis de fixation de cotyle rompues. C’est un article à paraître en septembre 2013 dans la revue Engineering Failure Analysis : 
