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Prediction of Fatigue Life of Steels in Consideration of Defect-induced Crack Initiation and Propagation

机译：考虑缺陷诱导的裂纹启动和繁殖的钢疲劳寿命预测

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摘要

In the present study, the prediction of fatigue life by representing characteristic variations of defects with probability distribution functions was conducted by dividing the fatigue process into the crack initiation and crack propagation. Voids, hard inclusions (Al_2O_3) and soft inclusions (MnS) in steels were supposed as defects and two prediction models were proposed. Only the life of crack propagation was predicted by Paris law in initial defects model (model A) while the life of crack initiation as well as propagation was predicted by Tanaka-Mura model in crack initiation model (model B). The stress intensity factor using (area)~(1/2) (projected square root area of defects) proposed by Murakami et al, was applied to Paris law in both models. The stress concentration due to defects and Taylor factor were applied to Tanaka-Mura model in the model B. These models were applied to four types of steels and the fatigue life was compared with the experimental results. In case of ductile cast iron including voids, the fatigue life predicted by both models was within the range of the experimental scattering. Although the fatigue life predicted by the model A was not consistent with the experimental results under high and low stress levels in case of Cr-Mo steel including MnS inclusions, the fatigue life predicted by the model B mostly showed a good agreement with experimental results. Therefore, it was demonstrated that the fatigue life prediction considering crack initiation showed higher precision than the prediction without crack initiation.
机译：在本研究中，通过将疲劳过程划分为裂纹启动和裂纹繁殖来进行通过代表概率分布函数的缺陷的特征变化来预测疲劳寿命。空隙，钢中的硬质夹杂物（Al_2O_3）和软夹杂物（MNS）被认为是缺陷，提出了两个预测模型。在初始缺陷模型（模型A）中，巴黎法律预测了裂缝繁殖的寿命，而Tanaka-Mura模型在裂纹启动模型中预测了裂缝启动的寿命和繁殖的寿命（模型B）。 Murakami等人提出的使用（面积）〜（1/2）（面积）〜（1/2）（缺陷的投影平方根区域）在两种模型中应用于巴黎法律。缺损和泰勒因子引起的应力浓度施用于模型B中的Tanaka-Mura模型。这些模型应用于四种类型的钢，与实验结果进行了比较疲劳寿命。在包括空隙的延性铸铁的情况下，两种模型预测的疲劳寿命在实验散射的范围内。虽然模型A预测的疲劳寿命与在包括MNS夹杂物的CR-MO钢的高低应力水平下的实验结果不一致，但模型预测的疲劳寿命主要显示出与实验结果良好的一致性。因此，证明考虑裂纹启动的疲劳寿命预测显示比没有裂纹开始的预测更高的精度。

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  • 来源
    《ISIJ international》 |2020年第4期|799-806|共8页
  • 作者

    Ryota SAKAGUCHI; Takayuki SHIRAIWA; Pornthep CHIVAVIBUL; Manabu ENOKI;

  • 作者单位

    Department of Materials Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan;

    Department of Materials Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan;

    Department of Materials Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan;

    Department of Materials Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan;

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

    fatigue; defects; crack initiation; crack propagation; stress concentration;

    机译：疲劳;缺陷;开采启动;裂缝繁殖;压力集中;

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