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Fatigue and ratcheting behaviors of CP-Ti at room temperature

机译：CP-Ti在室温下的疲劳和棘轮行为

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摘要

Based on the careful analyses of the stress controlled fatigue behavior of commercially pure titanium (CP-Ti) at room temperature, two stress regions can be evidently identified by cycle strain range, ratcheting strain, min ratcheting strain rate, ratcheting failure strain and fracture morphologies. In the high stress region, the ratcheting behavior is significant, and the failure is caused by the large ratcheting deformation. However, in the low stress region, the ratcheting behavior is weak, and the failure is the typical fatigue fracture, with fatigue crack initiation, fatigue extension, and instant rupture. In the high stress region, for both ratcheting and fatigue behaviors, the influence of max stress is greater than stress amplitude. On the contrary, in the low stress region, the influence of stress amplitude on the fatigue behavior is greater than max stress. But the ratcheting behavior in the low stress region is still max stress controlled. Based on the discussion on the fatigue life prediction model, traditional Basquin model and energy based model cannot supply precise fatigue life in the wide stress range, since the ratcheting behavior is not considered. The coupled fatigue damage and ratcheting damage model is proved to make a robust prediction.
机译：根据对商用纯钛（CP-Ti）在室温下的应力控制疲劳行为的仔细分析，可以通过循环应变范围，棘轮应变，最小棘轮应变速率，棘轮破坏应变和断裂形态来明显识别两个应力区域。 。在高应力区域，棘轮行为很明显，而失效是由于棘轮变形大所致。然而，在低应力区域，棘轮行为较弱，并且失效是典型的疲劳断裂，具有疲劳裂纹萌生，疲劳延伸和瞬间断裂。在高应力区域，对于棘轮和疲劳行为，最大应力的影响大于应力幅度。相反，在低应力区域，应力幅度对疲劳行为的影响大于最大应力。但是在低应力区域中的棘轮行为仍受最大应力控制。基于对疲劳寿命预测模型的讨论，传统的Basquin模型和基于能量的模型无法在宽应力范围内提供精确的疲劳寿命，因为没有考虑棘轮行为。疲劳损伤和棘轮损伤耦合模型被证明是一个可靠的预测。

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  • 来源
    《Materials Science and Engineering》 |2014年第10期|329-337|共9页
  • 作者

    Jian Peng; Chang-Yu Zhou; Qiao Dai; Xiao-Hua He; Xiaochun Yu;

  • 作者单位

    School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China;

    School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China;

    School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China;

    School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China;

    School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fatigue; Ratcheting; CP-Ti;

    机译：疲劳;棘轮CP钛;

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