Abstract
The plastic strain range of stress-strain curve during fatigue process was measured for an annealed and rolled carbon steel S45C, SUS304, aluminum, and copper alloys. The plastic strain range was evaluated from the movable dislocation density. It was found that variation in movable dislocation density p was expressed as a function of the number of stress cycles n by following equation using a model based on the multiplication and annihilation process of dislocations. [numerical formula] It was concluded that the calculation using this equation corresponds well with the variation in plastic strain range.
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