Three-dimensional fatigue crack initiation and propagation behavior of stress-corroded steel wires for bridge cables

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-11-19 DOI:10.1016/j.ijfatigue.2024.108717

Rou Li , Hao Wang , Changqing Miao , Zhijie Yuan , Zongxing Zhang

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Abstract

The fatigue test was carried out to investigate the fracture morphology and fatigue life of stress-corroded steel wires. The influence of stress corrosion degree on the initial value of crack propagation and fracture toughness of steel wires was explored. The theoretical method of crack initiation and propagation life of corroded steel wires based on CM-EIFS (Corrosion Modified Equivalent Initial Flaw Size) model was proposed. Finally, the variation law of crack tip stress was studied through the numerical method considering the corrosion surface, and the general expression of shape factor of crack tip and the reduction factor of fracture toughness of corroded steel wires were given. The results showed that the fatigue life of steel wires had a good nonlinear decrease trend with the stress corrosion degree increase. The crack initiation is often located in the surface corrosion pit, and the initiation zone was related to the intermetallic compound containing Fe and Mn. It was necessary to consider the reduction of fracture toughness for steel wires with high degree of stress corrosion. When the stress corrosion degree reached 24 %, the fracture toughness of steel wire was only 50.86 MPa·m^0.5, which was 52 % lower than that of the non-corrosion ones. The higher the stress corrosion degree and stress concentration factor, the lower the proportion of crack initiation life. When the stress concentration reached a certain degree, the total fatigue life was mainly composed of crack propagation life. The depth-width ratio of corrosion pit and the residual thickness of corroded steel wires were the key factors affecting the stress intensity factor at the crack tip. The three-dimensional crack propagation results obtained by XFEM (Extended Finite Element Method) based on the corrosion surface were highly consistent with the test results.

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桥梁缆索应力腐蚀钢丝的三维疲劳裂纹起始和扩展行为

通过疲劳试验研究了应力腐蚀钢丝的断裂形态和疲劳寿命。探讨了应力腐蚀程度对钢丝裂纹扩展初始值和断裂韧性的影响。提出了基于 CM-EIFS（腐蚀修正等效初始缺陷尺寸）模型的腐蚀钢丝裂纹起始和扩展寿命理论方法。最后，通过考虑腐蚀面的数值方法研究了裂纹尖端应力的变化规律，给出了腐蚀钢丝裂纹尖端形状系数和断裂韧性降低系数的一般表达式。结果表明，随着应力腐蚀程度的增加，钢丝的疲劳寿命呈良好的非线性下降趋势。裂纹起始点通常位于表面腐蚀坑中，起始区与含铁和锰的金属间化合物有关。有必要考虑高应力腐蚀度钢丝断裂韧性的降低。当应力腐蚀度达到 24% 时，钢丝的断裂韧性仅为 50.86 MPa-m0.5，比未腐蚀钢丝的断裂韧性低 52%。应力腐蚀度和应力集中系数越高，裂纹起始寿命的比例越低。当应力集中到一定程度时，总疲劳寿命主要由裂纹扩展寿命构成。腐蚀坑的深宽比和腐蚀钢丝的残余厚度是影响裂纹尖端应力强度因子的关键因素。基于腐蚀表面的 XFEM（扩展有限元法）得出的三维裂纹扩展结果与试验结果高度一致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.