Article ID Journal Published Year Pages File Type
5463729 Materials Letters 2017 4 Pages PDF
Abstract
The axial fatigue tests at room temperature for smooth specimens with theoretical stress concentration factor, Kt=1 and notched specimens Kt=2, 3 and 5 were performed in a high-strength 40CrNi2Si2MoVA steel for different stress ratio, R, that is the ratio of minimum stress to maximum stress, of −1, 0.06 and 0.5, respectively. Fatigue strength/limit for 1×107 cycles were determined according to a stair-case method. The stress concentration sensitivity and mean stress sensitivity are characterized by q factor and M factor, respectively. Moreover, a new model for evaluate the mean stress effects of high-strength steels was proposed, which is different from Goodman relation and Gerber parabola.
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Physical Sciences and Engineering Materials Science Nanotechnology
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