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Fatigue characterization and modeling of 30CrNiMo8HH under multiaxial loading

机译：30CrNiMo8HH在多轴载荷下的疲劳特性与建模

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摘要

Fatigue of 30CrNiMo8HH steel alloy has been studied thoroughly. Uniaxial cyclic tension-compression, cyclic torsion, proportional tension-torsion, and non-proportional tension-torsion at various strain ratios have been considered. Tests were performed at standard laboratory conditions on solid and tubular specimens machined from an actual driveline component. Fractography was conducted on the tested samples to investigate the fatigue mechanisms involved. Under torsion, large numbers of early micro cracks were found to emanate from the sample's surface, with a few propagating into very long longitudinal cracks. In biaxial tests, cracks tend to propagate into the gauge reducing the cross section area. A strain energy density fatigue parameter has been employed for life prediction of the material under uniaxial and biaxial loading. The life prediction method is based on two different cracking mechanisms that agree with the observed cracking mechanisms in torsion and biaxial loading of 30CrNiMo8HH steel alloy studied here. Energy-based properties are obtained and the predicted lives are compared to experimental results. The results obtained agree well with experiments.
机译：对30CrNiMo8HH合金的疲劳进行了深入研究。已经考虑了在各种应变比下的单轴循环拉伸-压缩，循环扭转，比例拉伸-扭转和非比例拉伸-扭转。测试是在标准实验室条件下对由实际传动系统组件加工的固体和管状样品进行的。对测试样品进行了断口扫描，以研究所涉及的疲劳机理。在扭转下，发现大量早期的微裂纹从样品的表面散发出来，少数裂纹扩展成很长的纵向裂纹。在双轴测试中，裂纹倾向于传播到应变仪中，从而减小了横截面积。应变能密度疲劳参数已用于单轴和双轴载荷下材料的寿命预测。寿命预测方法基于两种不同的开裂机理，这些开裂机理与此处研究的30CrNiMo8HH钢合金在扭转和双轴载荷下观察到的开裂机理一致。获得基于能量的特性，并将预测寿命与实验结果进行比较。获得的结果与实验非常吻合。

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  • 来源
    《Materials Science and Engineering》 |2011年第6期|p.2484-2494|共11页
  • 作者

    M. Noban; H. Jahed; S. Winkler; A. Ince;

  • 作者单位

    Mechanical and Mechatronics Engineering Department, University of Waterloo, 200 University Ave W, Waterloo, Ontario, N2L 3GI Canada;

    Mechanical and Mechatronics Engineering Department, University of Waterloo, 200 University Ave W, Waterloo, Ontario, N2L 5H5 Canada;

    Mechanical and Mechatronics Engineering Department, University of Waterloo, 200 University Ave W, Waterloo, Ontario, N2L 3GI Canada;

    Mechanical and Mechatronics Engineering Department, University of Waterloo, 200 University Ave W, Waterloo, Ontario, N2L 3GI Canada;

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  • 正文语种 eng
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  • 关键词

    fatigue characterization; fatigue modeling; multiaxial loading; cracking mechanism; high strength steel;

    机译：疲劳特性疲劳建模;多轴载荷破解机制高强度钢;

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