In this study, the relationship between fatigue life and the feature parameters of fatigue fracture surfaces was statistically analyzed to successfully develop a new fatigue life prediction approach. Results showed that the inclusion location was an important parameter affecting fatigue life besides stress amplitude, inclusion size and material hardness. A new stress concentration influence factor associated with the effective depth of inclusions was defined to make fatigue strength and fatigue life prediction models more reliable. The newly proposed fatigue life prediction model could uniformly predict inclusion-induced high cycle and very-high cycle fatigue life, needless to classify surface or interior inclusion. Furthermore, this approach also demonstrated strong capability in predicting fatigue strength.

中文翻译：

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贝氏体/马氏体多相钢表面和内部夹杂物引起的高周和超高周疲劳的疲劳寿命预测方法


本研究对疲劳寿命与疲劳断裂表面特征参数之间的关系进行了统计分析，成功开发了一种新的疲劳寿命预测方法。结果表明，夹杂物位置是除应力幅值、夹杂物尺寸和材料硬度外影响疲劳寿命的重要参数。定义了与夹杂物的有效深度相关的新应力集中影响因子，以使疲劳强度和疲劳寿命预测模型更加可靠。新提出的疲劳寿命预测模型可以均匀预测夹杂物诱导的高循环和极高循环疲劳寿命，无需对表面或内部夹杂物进行分类。此外，这种方法还显示出预测疲劳强度的强大能力。