Abstract
A novel method is presented to estimate the lower bound of the scatter in fatigue limit of ductile iron based upon the information of microstructural in homogeneities and loading conditions. The predictive capability of the method was verified by comparing to the experimental data obtained by the rotating-bending, torsion and combined tension-torsion fatigue tests for ductile irons with ferritic, pearlitic and bulls-eye (ferritic/pearlitic) microstructures.
Highlights
Fatigue strength of ductile iron is significantly influenced by the microstructural inhomogeneities, i.e., graphite, casting defects, and matrix structures composed of different phases
Laboratory tests with a limited number of small-sized specimens are likely to provide non-conservative fatigue strength in comparison with the actual strength of high-volume commercial products
The purpose of this study is to propose a practical method that enables one to predict the lower bound of the scatter in fatigue limit in a judicious manner
Summary
Fatigue strength of ductile iron is significantly influenced by the microstructural inhomogeneities, i.e., graphite, casting defects, and matrix structures composed of different phases. Laboratory tests with a limited number of small-sized specimens are likely to provide non-conservative fatigue strength in comparison with the actual strength of high-volume commercial products. The purpose of this study is to propose a practical method that enables one to predict the lower bound of the scatter in fatigue limit in a judicious manner
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