Influence of micro-shrinkage on the fatigue behavior of ductile iron
Fatigue crack growth and conventional fatigue tests have been carried out from different sampling locations within a wind turbine hub.S/N curves as well as fatigue crack propagation properties have been determined in dependency of the local microstructure.Subsequent fractographic analysis of the conventional fatigue tests showed micro-shrinkage to be the dominant reason for crack initiation.Statistical analysis of these micro-shrinkages showed a relationship between their size and the local solidification conditions.A model is proposed,linking the size of the shrinkages and the fatigue strength of nodular cast iron.Using this model,it is possible to describe the fatigue strength of nodular cast iron in dependence of the local solidification conditions or local microstructure,respectively.
Ductile Iron fatigue defects micro-shrinkage
Paul Kainzinger Christoph Guster Martin Severing Anton Wolf
Chair of Mechanical Engineering,Montanuniversitaet Leoben,Leoben,Austria SHW Casting Technologies,Aalen-Wasseralfingen,Germany AMSC Austria,Klagenfurt,Austria
国际会议
北京
英文
1-9
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）