Fatigue strength degradation of metals in corrosive environments

1st Conference of Computational Methods in Offshore Technology

计算机科学

Adasooriya, N.D.^1 ; Hemmingsen, T.^1 ; Pavlou, D.^1

Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Norway^1

关键词: Analytical approach;    Corrosion degradation;    Corrosive environment;    Environmental conditions;    High cycle fatigue;    Surface irregularities;    Time-dependent loss;    Very high cycle fatigue;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/276/1/012039/pdf
DOI  :  10.1088/1757-899X/276/1/012039

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Structures exposed to aggressive environmental conditions are often subjected to time-dependent loss of coating and loss of material due to corrosion; this causes reduction in the cross-sectional properties of the members, increased surface roughness, surface irregularities and corrosion pits, and degradation of material strengths. These effects have been identified and simulated in different research studies. However, time and corrosive media dependent fatigue strength curves for materials have not been discussed in the design or assessment guidelines for structures. This paper attempts to review the corrosion degradation process and available approaches/models used to determine the fatigue strength of corroded materials and to interpolate corrosion deterioration data. High cycle fatigue and full range fatigue life formulae for fatigue strength of corroded materials are proposed. The above formulae depend on the endurance limit of corroded material, in addition to the stress-life fatigue curve parameters of the uncorroded material. The endurance limit of corroded material can either be determined by a limited number of tests in the very high-cycle fatigue region or predicted by an analytical approach. Comparison with experimentally measured corrosion fatigue behavior of several materials is provided and discussed.