Linking information from non-destructive testing and casting process simulation of components made of nodular cast iron with the cyclic, strain-based material behavior influenced by dross

摘要

The fatigue life assessment of large cast components, e.g. for windenergy application, requires knowledge of material strength as well asthe inclusion of information from casting process simulation and nondestructivetesting. These methods provide the opportunity to estimate,for instance, the position and characteristics of dross in nodular cast iron(GJS). Specimens with and without dross are analyzed based on straincontrolledfatigue tests and correlated with the results of computertomography images in order to gain the necessary knowledge about theinfluence of dross on fatigue strength. Metallographic and fractographicinvestigations are carried out on fatigue specimens and compared withthe results of the fatigue tests. Additionally, virtual limiting samples canbe used to assign a value for fatigue-acceptable imperfections to eachcomponent area. Moreover, data from casting process simulation,simulation of local stress and the requirement for fatigue life can becorrelated with this concept.