Fatigue Strength Improvement by Replacing Welded Joints with Ductile Cast Iron Joints

In this study fatigue experiments are conducted for ductile cast iron (DCI) to compare with the fatigue strength of cruciform welded joints. Here, several DCI specimens are prepared to have nearly the same fatigue strength in smooth specimens before welding and to have similar cruciform shapes in th...

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Bibliographic Details
Published inTetsu-to-Hagane Vol. 105; no. 6; pp. 619 - 628
Main Authors Hidaka, Tetsuro, Noda, Nao-Aki, Sano, Yoshikazu, Kai, Nobuhiro, Fujimoto, Hiroyoshi
Format Journal Article
LanguageJapanese
Published The Iron and Steel Institute of Japan 01.06.2019
Subjects
ductile cast iron
fatigue strength
notch insensitivity
residual stress
stress concentration
welded joint
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Summary:In this study fatigue experiments are conducted for ductile cast iron (DCI) to compare with the fatigue strength of cruciform welded joints. Here, several DCI specimens are prepared to have nearly the same fatigue strength in smooth specimens before welding and to have similar cruciform shapes in the welded joints. It is found that the fatigue strength of DCI specimen is about three times larger than that of the welded joint specimens. The fatigue strength improvement can be explained in terms of the small stress concentration factor, notch insensitivity and compressive residual stress generated by shot blasting for DCI joints.
ISSN:0021-1575
1883-2954
DOI:10.2355/tetsutohagane.TETSU-2018-158