Effects of Mean stress and Temperature on the Fatigue strength of Tough Pitch Copper

Abstract

In large rotating machines such as generators and electric motors, demands for more high power and reducing environmental load are becoming severe. As a result, the conductor which is a part of the rotor receives more pulsation change, and the long-life region with low stress which conventionally had no need to think must be investigated. In the field of steel material, researches about the effect of Mean stress and environment temperature on fatigue strength in the case of long-life region are actively conducted. However, in the field of copper which is a conductor material, there are few researches in the case of long-life region, and the effects of Mean stress and environment temperature on time strength are not clear. Therefore, in this study, the influence of the Mean stress and environment temperature in the high cycle area of the copper material was clarified by using the servo hydraulic load frame.