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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.1: Codes and Standards >DEVELOPMENT OF NEW S-N CURVES BASED ON SMALL CRACK METHODOLOGY
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DEVELOPMENT OF NEW S-N CURVES BASED ON SMALL CRACK METHODOLOGY

机译：基于小裂纹方法的新型S-N曲线的开发

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摘要

The propagation behavior of short cracks cannot be studied by linear elastic methods because of large plastic region near the crack tip, as well as a breakdown in correlation of the stress intensity factor with the fatigue crack growth rates. The proposed fatigue design approach incorporates a distance parameter in conjunction with linear elastic fracture mechanics and effectively integrates long and short crack growth test data. This distance parameter is a material constant that allows for the effects of (a) large-scale plasticity, (b) crack closure and (c) fatigue crack threshold. Furthermore, this parameter can be used to successfully predict fatigue crack growth behavior of short cracks. The practical application of this method to study fatigue crack initiation in pressure vessels rests on the concept that initiation occurs only when the material ahead of the crack tip is damaged enough by cyclic straining. The initiation and growth of small cracks have been investigated along with consideration for crack closure.
机译：由于裂纹尖端附近的塑性区较大，以及应力强度因子与疲劳裂纹扩展速率之间的相关关系破裂，因此无法通过线性弹性方法研究短裂纹的扩展行为。提出的疲劳设计方法结合了距离参数和线性弹性断裂力学，并有效地整合了长短裂纹增长测试数据。该距离参数是一个材料常数，该常数允许（a）大规模可塑性，（b）裂纹闭合和（c）疲劳裂纹阈值的影响。此外，该参数可用于成功预测短裂纹的疲劳裂纹扩展行为。该方法在压力容器中研究疲劳裂纹萌生的实际应用基于这样的概念，即仅当裂纹尖端之前的材料被循环应变充分破坏时才会发生萌生。研究了小裂纹的萌生和扩展，并考虑了裂纹的闭合。

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