Change of Fatigue Properties of Steel-S460NL Damaged by Various Levels of Corrosion

This study investigates the effect of corrosion on the fatigue performance of S460 NL high-strength steel, which is commonly used in offshore structures exposed to harsh conditions. We conducted fatigue tests and analyzed S-N curves over various exposure periods while simulating corrosion conditions in a laboratory setting. The findings show a direct correlation between prolonged corrosion exposure and increased fatigue damage. Our findings show that longer corrosion periods result in significant accumulation of corrosion products, thereby increasing the severity of metallic corrosion. Using damage theory, we quantified mechanical property degradation, providing important insights into fracture formation mechanisms. High stress levels were associated with fewer fatigue striations and more cumulative damage. These findings have significant implications for improving the durability and reliability of S460 NL steel in practical engineering applications.