Experimental and Numerical Study on the Effect of Corrosion on the Fatigue Behavior of a Marine Ship Hull

Influence of corrosion on fatigue behavior of the hull of marine ships. This research talks about the effect of the phenomenon of corrosion resulting from marine salt water on the fatigue limit and fatigue life of C35 carbon steel, which is used to manufacture plates for the hulls of marine ships in the ship port in Basra. Five stress levels were applied (200.7, 211.5, 220.7, 231.5, 240.7) (MPa). Laboratory-prepared artificial seawater was used in the corrosion-fatigue test. An estimated equation was derived to predict the fatigue life and limit to determine the fatigue behavior of C35 carbon steel. The numerical method was used in the prediction process using MATLAB Software. It was concluded from this research that the fatigue life decreased by 70.15% for corroded samples compared to samples that were not subjected to corrosion. The fatigue limit decreased, which weakened the metal's ability to resist cyclic loads. The predictive model is economical and saves the cost of many samples, as we only need five samples for each case.