The use of fracture mechanics based methodologies to assess the influence of defects on the high cycle fatigue resistance of mechanical components has become increasingly important for industrial applications and design. This presentation introduces the most commonly used fracture mechanics methods, emphasizing the assumptions on which they are based and analyzing their potential in predicting the influence of the main geometrical, mechanical and microstructural variables involved in the definition of the fatigue resistance of the components. Underlying hypotheses are discussed thoroughly and possible directions for future research are suggested. Applications examples on different configurations with small defects are presented. Finally, the potential of the fracture mechanics methodologies is analyzed when proposing simplifications suitable for use in the development of design documents for engineering applications.

使用基于断裂力学的方法来评估缺陷对机械部件的高周疲劳强度的影响对于工业应用和设计变得越来越重要。本演讲介绍了最常用的断裂力学方法，强调了它们所基于的假设，并分析了它们在预测部件疲劳强度定义中涉及的主要几何、机械和微观结构变量的影响方面的潜力。对基本假设进行了彻底讨论，并提出了未来研究的可能方向。介绍了具有小缺陷的不同配置的应用示例。最后，