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首页> 外文会议>Fatigue and fracture mechanics >Fatigue Crack Closure at Near-Threshold Growth Rates in Steels, Effects of Microstructure,Load Sequence and Environment
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Fatigue Crack Closure at Near-Threshold Growth Rates in Steels, Effects of Microstructure,Load Sequence and Environment

机译：钢在近阈值生长速率下的疲劳裂纹闭合，组织，载荷序列和环境的影响

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This paper summarizes long-term research on fatigue crack closure in several labs of the author. Various experimental techniques were used in different combinations. Primarily, a sophisticated dynamic compliance technique based on highly sensitive resonance vibration measurements and crack tip diffracted ultrasonic wave analysis is applied. Whereas the first method reflects the global through thickness behavior, the second method enables spatial resolution, which is achieved with a reduction of sensitivity yet has the advantage that the signal generation is independent on the stress state ahead of the crack tip. The results allow a coherent view into the effects of the stress state, material plasticity, fracture surface roughness, and oxidation tendency on the closure behavior and, therefore, on both the threshold stress intensity and near-threshold crack propagation. Specifically, the different load ratio, load sequence, and the environmental effects on the threshold values of ferritic, martensitic, and austenitic steels are addressed.
机译：本文总结了作者在多个实验室中对疲劳裂纹闭合的长期研究。各种实验技术以不同的组合使用。首先，应用了基于高灵敏度共振振动测量和裂纹尖端衍射超声波分析的复杂动态柔度技术。第一种方法反映了整个厚度行为，而第二种方法可以实现空间分辨率，这是通过降低灵敏度实现的，但其优点是信号的产生与裂纹尖端之前的应力状态无关。结果使得可以一致地了解应力状态，材料可塑性，断裂表面粗糙度和氧化趋势对闭合行为的影响，因此对阈值应力强度和接近阈值的裂纹扩展也有影响。具体而言，解决了不同的负载比，负载顺序以及环境因素对铁素体，马氏体和奥氏体钢的阈值的影响。

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