海洋环境下S355结构钢点蚀疲劳强度退化的数值研究

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2025-05-01 DOI:10.1016/j.engfailanal.2025.109669

S.A. Elahi , F. Mehri Sofiani , S. Chaudhuri , J.A. Balbín , N.O. Larrosa , W. De Waele

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引用次数: 0

摘要

研究了海上风电支撑结构中常用的S355钢的点腐蚀对其疲劳强度的影响。采用短裂纹微结构模型对退化疲劳强度进行估计，以最小的输入参数有效地捕捉了问题的物理性质。材料特性试验提供了S355钢的关键力学性能。参数分析是用来检查坑的形状，大小和纵横比的影响。在不同的凹坑长径比下，确定了退化的疲劳强度与凹坑尺寸之间的一般关系。灵敏度分析表明，凹坑长径比对疲劳强度有显著影响，凹坑越尖锐，降低幅度越大。阈值应力强度因子影响中等，空气疲劳强度和晶粒尺寸影响最小。为了评估S355钢在北海环境下的疲劳强度退化，进行了一项案例研究。研究结果表明，最严重的降解发生在暴露的最初几年，降解率随着时间的推移而下降。结果与实验数据很好地吻合，为评估海洋环境中的结构完整性提供了一个强大的框架。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

A numerical study on fatigue strength degradation due to pitting corrosion of S355 structural steel in a marine environment

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A numerical study on fatigue strength degradation due to pitting corrosion of S355 structural steel in a marine environment

This study investigates the influence of pitting corrosion on the fatigue strength of S355 steel, commonly used in offshore wind support structures. A short crack microstructural model is employed to estimate the degraded fatigue strength, effectively capturing the physics of the problem with minimal input parameters. Material characterization tests provide the key mechanical properties of S355 steel.

A parametric analysis is used to examine the effects of pit shape, size, and aspect ratio. A generic relationship is identified between degraded fatigue strength and pit size for various pit aspect ratios. A sensitivity analysis reveals that the pit aspect ratio significantly influences fatigue strength, with sharper pits leading to greater reductions. The threshold stress intensity factor has a moderate effect, while in-air fatigue strength and grain size have minimal impacts.

A case study is performed to evaluate the fatigue strength degradation of S355 steel exposed to the North Sea environment. Findings indicate that the most severe degradation occurs in the initial years of exposure, with the degradation rate declining over time. The results align well with experimental data, offering a robust framework for assessing structural integrity in a marine environment.

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来源期刊

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.