NUMERICAL AND EXPERIMENTAL INVESTIGATIONS OF OVERLOAD EFFECTS DURING FATIGUE CRACK GROWTH IN NODULAR CAST IRON

摘要

Today, nodular cast iron is intensively used in highly stressed components like wind turbine, machine and vehicle components, where variable cyclic loads are applied. In contrast to other common materials, where crack growth retardation is observed after overloads, crack growth acceleration was detected in fatigue crack growth experiments within nodular cast iron. Therefore, detailed experimental and numerical investigations were performed in order to get a better understanding of fatigue crack growth mechanisms in nodular cast iron under constant and variable amplitude loading for an improvement of existing lifetime calculation standards.