Abstract
Specimens of two sizes have been taken from two sampling locations within a wind turbine hub made of nodular cast iron (EN-GJS-400-18-LT) for constant amplitude fatigue testing. The sampling positions exhibit varying cooling conditions, resulting in different microstructures. Fatigue tests have been carried out at R-ratios of R = −1 and R = 0. The coarse microstructure as well as the larger specimens yielded in lower fatigue strengths. No effect of the microstructure or the specimen size on the mean stress sensitivity has been found. Fractographic analysis of the fractured specimen's surface revealed micro-shrinkages to be the source of crack initiation for all specimens. Micro-shrinkage size increases from fine to coarse microstructure and with increasing specimen size. The El-Haddad equation using the √area parameter was used to describe the fatigue limit. The results were in good agreement with the experiments.
Highlights
Ductile Iron is widely used throughout different industrial fields due to its beneficial castability, price-performance ratio and availability
Specimens of two sizes have been taken from two sampling locations within a wind turbine hub made of nodular cast iron (EN-GJS-400-18-LT) for constant amplitude fatigue testing
The characterization of the mean stress sensitivity of the ductile iron EN-GJS-400-18-LT is subject of the present paper
Summary
Ductile Iron is widely used throughout different industrial fields due to its beneficial castability, price-performance ratio and availability. Components made of ductile Iron are often subjected to dynamic loads. Superimposed mean stresses significantly influence the durable stress amplitude. The characterization of the mean stress sensitivity of the ductile iron EN-GJS-400-18-LT is subject of the present paper
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