44 - Effect of Surface Defects on Fatigue Properties of Ferritic Ductile Iron

Abstract:

The fatigue strength of ferritic ductile iron, Grade EN-GJS-400-18U-LT, was determined for large section castings measuring 4 by 24 by 24 inches. Fatigue testing was conducted in bending fatigue in order to determine the influence of surface conditions on fatigue strength. Test specimens with various surface conditions were evaluated, including notched and un-notched specimens, as well as those containing surface defects typical of heavy section ductile iron castings. In addition, smaller, round axial fatigue test specimens were tested to produce the more typical laboratory fatigue test properties for comparison with other materials tested for the Ductile Iron Society.