Quantitative assessment of compression fatigue history effect on the subsequent tension fatigue limit of strain localized material

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-10-31 DOI:10.1016/j.ijfatigue.2024.108682

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Abstract

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.

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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

本研究对应变局部材料进行了带有扩展缺口的压缩疲劳试验，以定量评估压缩疲劳过程中的损伤以及加载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"。前者的特点是同时出现多条裂纹并独立扩展。相反，后者的特征是主裂纹和次裂纹之间的凝聚。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不扩展的近裂纹尖端力学。此外，通过研究压缩疲劳时的非扩展裂纹长度、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，该方法与机械小裂纹的村上-恩多方程参数相对应。因此，这项研究对于理解不同载荷块引起的疲劳损伤和改进米纳法则具有重要意义。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.