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首页> 外文会议>Proceeding of An International Conference the Importance of understanding the fundamentals of the fatigue Process in Counteracting Its Effects in Engineering Components and Structures,and to Reflect on the Contributions of K.J.Miller Sheffield/United >Considerations for fatigue crack growth relative to crack tip displacement
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Considerations for fatigue crack growth relative to crack tip displacement

机译：疲劳裂纹扩展相对于裂纹尖端位移的考虑

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摘要

The underlying mechanisms are reviewed for insight into why fatigue crack growth per cycle is often so small compared to the macroscopic crack tip displacement.To help judge regimes,typical parameters and order-of-magnitude relations are given for various aspects of fatigue crack growth.A log-log plot of da/dN versus the tip displacement,from atomic to structural scales,is compared to a normalized Paris-rule correlation with the range of stress intensity factor.It is concluded that reliable and economical design and maintenance must still be based on tests that closely simulate the service needs,in the light of the history-dependent mechanisms of roughening and closure.
机译：审查了潜在的机理，以了解为什么每个循环的疲劳裂纹扩展与宏观裂纹尖端位移相比通常如此之小。为帮助判断状态，给出了疲劳裂纹扩展各个方面的典型参数和量级关系。将da / dN与尖端位移（从原子尺度到结构尺度）的对数对数图与应力强度因子范围内的归一化Paris-规则相关性进行了比较。结论是，仍必须进行可靠且经济的设计和维护基于紧密依赖于粗化和封闭的历史机制的测试，基于紧密模拟服务需求的测试。

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