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首页> 外文期刊>International Journal of Fatigue >Experimental research on dominant effective short fatigue crack behavior for railway LZ50 axle steel
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Experimental research on dominant effective short fatigue crack behavior for railway LZ50 axle steel

机译：铁路LZ50车轴钢显性有效短疲劳裂纹行为的试验研究。

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摘要

Behavior of dominant effective short fatigue crack, the crack results in the final failure of specimen, was experimentally investigated by a replica technique with seven smooth hourglass shaped specimens of railway LZ50 axle steel. Character of two-stages, i.e. the micro-structural short crack stage and the physical short crack stage, was revealed for the crack initiation and growth. Most importantly, the crack growth rate exhibited decelerations twice in micro-structural short crack stage. This behavior was related to the ferrite grain boundary firstly and then to the pearlite banded structure. The boundary appeared a barrier because there were pearlites around with significant higher micro-hardness values. Also because of the higher hardness values, the layered pearlite banded structure acted as another barrier for the crack to overcome. In physical short crack stage, the crack propagated with a decreasing resistance of micro-structural barriers as the crack length increased. Hence, the process of crack initiation and growth are subjected to the competition between the intrinsic resistances from the barriers and the increasing driving force from the growing crack size. Finally, a new short crack growth model is presented to describe the periodic influence of micro-structural barriers. Description to the test results of LZ5O steel has indicated the availability and reasonability of present model.
机译：通过复制技术对七个铁路LZ50轴钢的光滑沙漏形试样进行复制实验，研究了主要有效短疲劳裂纹的行为，该裂纹导致了试样的最终破坏。揭示了裂纹萌生和扩展的两个阶段的特征，即微观结构的短裂纹阶段和物理短裂纹阶段。最重要的是，在微观结构短裂纹阶段，裂纹扩展速率呈现两次减速。这种行为首先与铁素体晶界有关，然后与珠光体带状组织有关。边界出现障碍，因为周围有珠光体具有较高的显微硬度值。同样由于较高的硬度值，层状珠光体带状结构充当了克服裂纹的另一个障碍。在物理短裂纹阶段，随着裂纹长度的增加，裂纹以微结构势垒的阻力减小的方式传播。因此，裂纹萌生和扩展的过程要经受来自势垒的内在阻力和来自裂纹尺寸不断增大的驱动力之间的竞争。最后，提出了一个新的短裂纹扩展模型来描述微观结构障碍的周期性影响。对LZ5O钢的测试结果的说明表明了该模型的可用性和合理性。

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  • 来源
    《International Journal of Fatigue》 |2012年第1期|p.71-78|共8页
  • 作者

    Bing Yang; YongXiang Zhao;

  • 作者单位

    Institute of Engineering Reliability and Safety, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China;

    Institute of Engineering Reliability and Safety, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fatigue; short crack; crack growth rate; railway; LZ50 axle steel;

    机译：疲劳;短裂纹裂纹增长率铁路;LZ50车轴钢;

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