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Quantitative assessment of compression fatigue history effect on the subsequent tension fatigue limit of strain localized material
International Journal of Fatigue ( IF 5.7 ) Pub Date : 2024-10-31 , DOI: 10.1016/j.ijfatigue.2024.108682 Bowen Chen, Shigeru Hamada, Takanori Kato, Taizo Makino, Hiroshi Noguchi
International Journal of Fatigue ( IF 5.7 ) Pub Date : 2024-10-31 , DOI: 10.1016/j.ijfatigue.2024.108682 Bowen Chen, Shigeru Hamada, Takanori Kato, Taizo Makino, Hiroshi Noguchi
This study conducts compressive fatigue tests with an extended notch on a strain-localized material for quantitative evaluation of damage during compression fatigue and the corresponding effect of loading history on subsequent tensile fatigue limits. Hence, fatigue crack “growth” and “propagation” of two types are found in damage accumulation (DA) mode. The former features several simultaneous multi-crack initiations and independent extensions. Contrarily, the latter features coalescence between the main and secondary cracks. Moreover, the near-crack-tip mechanics causing crack extension and non-propagation in the respective fatigue crack extension types are discussed. Furthermore, a method for subsequent tensile fatigue limit prediction considering the compression fatigue effect is proposed by studying the non-propagating crack length, Vickers hardness, and residual stress in the DA mode during compression fatigue, corresponding to Murakami–Endo’s equation parameters for a mechanically small crack. Thus, this study is anticipated to hold great significance for understanding fatigue damage caused by different load blocks and improving Miner’s rule.
中文翻译:
压缩疲劳历史对应变局部材料后续拉伸疲劳极限影响的定量评估
本研究对应变定位材料进行带有扩展缺口的压缩疲劳测试,以定量评估压缩疲劳过程中的损伤以及载荷历史对后续拉伸疲劳极限的相应影响。因此,在损伤累积 (DA) 模式下发现了两种类型的疲劳裂纹“增长”和“扩展”。前者具有多个同步多裂纹起始和独立延伸。相反,后者的特点是主裂缝和次裂缝之间的聚结。此外,还讨论了在各自的疲劳裂纹扩展类型中导致裂纹扩展和非扩展的近裂纹尖端力学。此外,通过研究压缩疲劳过程中非扩展裂纹长度、维氏硬度和 DA 模式下的残余应力,提出了一种考虑压缩疲劳效应的后续拉伸疲劳极限预测方法,对应于机械小裂纹的 Murakami-Endo 方程参数。因此,本研究有望对理解不同载荷块引起的疲劳损伤和改进 Miner 规则具有重要意义。
更新日期:2024-10-31
中文翻译:
压缩疲劳历史对应变局部材料后续拉伸疲劳极限影响的定量评估
本研究对应变定位材料进行带有扩展缺口的压缩疲劳测试,以定量评估压缩疲劳过程中的损伤以及载荷历史对后续拉伸疲劳极限的相应影响。因此,在损伤累积 (DA) 模式下发现了两种类型的疲劳裂纹“增长”和“扩展”。前者具有多个同步多裂纹起始和独立延伸。相反,后者的特点是主裂缝和次裂缝之间的聚结。此外,还讨论了在各自的疲劳裂纹扩展类型中导致裂纹扩展和非扩展的近裂纹尖端力学。此外,通过研究压缩疲劳过程中非扩展裂纹长度、维氏硬度和 DA 模式下的残余应力,提出了一种考虑压缩疲劳效应的后续拉伸疲劳极限预测方法,对应于机械小裂纹的 Murakami-Endo 方程参数。因此,本研究有望对理解不同载荷块引起的疲劳损伤和改进 Miner 规则具有重要意义。