Abstract The impact of a controlled surface imperfection on the low-cycle fatigue life in two different steels is investigated. After introduction of a single imperfection with a depth varying from 50 to 350 µm in cylindrical samples, fatigue tests were conducted under fully-reversed total axial strain control in air at ambient temperature. It is shown that the fatigue life is significantly reduced, even in presence of small imperfections. In addition, the use of the potential drop methods provided an assesment of the initiation life and the determination of crack growth rates. Two characteristic crack growth domains were thus identified.

中文翻译：

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核钢受控表面缺陷引起的低周疲劳裂纹萌生和扩展

摘要 研究了受控表面缺陷对两种不同钢的低周疲劳寿命的影响。在圆柱形样品中引入深度从 50 到 350 µm 的单个缺陷后，在环境温度下在空气中完全反向总轴向应变控制下进行疲劳测试。结果表明，即使存在小缺陷，疲劳寿命也会显着降低。此外，电位下降法的使用提供了对起始寿命的评估和裂纹扩展速率的确定。因此确定了两个特征裂纹扩展域。