Fatigue strength study based on geometric shape of bulk defects in cast steel

This work applies Taylor’s Theory of Critical Distances (TCD) to assess the fatigue strength of defect-afflicted cast steel components made of G21Mn5+N. Based on radiographs of complexly shaped spatial imperfections, the established TCD-framework leads to a sound agreement of numerical and experimen...

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Bibliographic Details
Published in:International journal of fatigue 2022-10, Vol.163, p.107082, Article 107082
Main Authors: Horvath, Michael, Stoschka, Michael, Fladischer, Stefan
Format: Article
Language:English
Subjects:
Cast steel
Defects
Fatigue design
Stress analysis
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Summary:This work applies Taylor’s Theory of Critical Distances (TCD) to assess the fatigue strength of defect-afflicted cast steel components made of G21Mn5+N. Based on radiographs of complexly shaped spatial imperfections, the established TCD-framework leads to a sound agreement of numerical and experimental fatigue strength. Moreover, a novel fatigue assessment methodology is presented, which bases on the projected planar defect shape, featuring an engineering-feasible design method without the need of extensive numerical simulations. About one-hundred additional imperfections referring to ASTM E446 class A and C validate the model, showing an average deviation of about five percent in fatigue strength. •Notch fatigue assessment of casting defects using planar projections.•Study of varying uniaxial load direction on shrinkage imperfections.•A novel geometry-based defect fatigue assessment methodology is presented.•Arbitrarily shaped imperfections are converted into planar, elliptical defects.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2022.107082