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Neuber关系可以描述平面应力、低应变条件缺口应变场;高应变条件则须用J积分方法;弹塑性断裂力学的新发展是描述了缺口应变场小裂纹传播规律及不传播裂纹形成条件。本文在评述上述基础性工作的基础上,阐述了缺口疲劳的基本特点,分析了予测缺口疲劳裂纹生成寿命的五种主要方法的理论依据,指明了缺口疲劳理论和方法的适用范围。
Neuber relationship can describe the plane strain and the low strain strain gap strain field; the high strain condition must use the J integral method; the new development of the elasto-plastic fracture mechanics describes the propagation law of the small strain field and the propagation condition of the non-propagating crack. On the basis of reviewing the above basic work, this paper expounds the basic characteristics of notch fatigue, analyzes the theoretical basis of the five main methods to predict the life span of fatigue cracks, and points out the applicable scope of notch fatigue theory and method.