Abstract
Fatigue test system with electrolytic-polishing apparatus was developed to study the mechanism and damage in fatigue in metallic micro-materials. Fatigue tests were conducted after manufacturing small cross-sectional specimens by the electrolytic-polishing apparatus. And electric potential changes of specimen were investigated during fatigue tests. In both materials, variations of fatigue lives were very large compared with conventional size specimens. Two types of fracture morphologies were observed. A.C. potential method was applied to clarify the fatigue mechanisms and monitoring fatigue damage in micro-materials. For iron, the value of potential were almost constant during fatigue process except for just before final fracture, while they continuously increased up to final unstable fracture in aluminum.
