Abstract
An experimental investigation of the effect of corrosive environment on the fatigue life of circular cross section specimens made from structural low carbon steel S355 is presented in this paper. Uniaxial load controlled fatigue tests in the regime of 105 to 107cycles were performed in two different environments: at room temperature in air (without corrosion) and in-situ fresh water solution environment. Various approaches to evaluate mean stress effect on stress-life behaviour in inert environment are reviewed and used to estimate the mean stress sensitivity factors both for air and corrosive environment. Mean stress sensitivity factor is calculated based on experimental results and predicted using the different approaches. Moreover, a comparison between Haigh Diagram predicted by these models and experimental results is proposed and the Walker approach is found to be the one that best fits experimental data.
Highlights
Corrosion fatigue is a common failure mechanism where mechanical parts or components are subjected to cycling loads in corrosive and aggressive environment
This work presents an experimental investigation of the effect of fresh water environment on the fatigue strength and the effect of stress ration on corrosion fatigue life of a structural low carbon steel
The experimental results show that the effect of corrosive environment is to reduce the fatigue strength of the material: deterioration is higher at lower level of stress amplitude but it occurs even a lower number of cycles
Summary
Corrosion fatigue is a common failure mechanism where mechanical parts or components are subjected to cycling loads in corrosive and aggressive environment. Corrosion fatigue failure is an essential design consideration in many industrial fields, where pumps components work under the influence of alternating load due to cyclic pressure in a corrosive environment that degrades material surface. Many studies have been conducted to understand how corrosive environment influences fatigue life of steel [1] and how fatigue strength of material decreases. Sea water condition are tested and many data are available in literature relevant to this condition. Other corrosive environment less aggressive have received less attention in research and, less data are available in literature. This study, because of application requirements, considers corrosion fatigue behaviour in fresh water environment
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