Retardation Effects of Fatigue Crack Propagation in the Optimum Ferrite-Bainite Steel

Autor:	Junichi Katsuta, Noboru Konda, Kazuyoshi Kawano, Shinichi Ushijima, Satoshi Kubo, Shuhei Koga
Rok vydání:	2010
Předmět:	Materials science business.industry Bainite Structural engineering Paris' law Crack growth resistance curve Crack closure Amplitude Ferrite (iron) mental disorders Growth rate Composite material business Stress concentration
Zdroj:	Journal of the Japan Society of Naval Architects and Ocean Engineers. 12:209-217
ISSN:	1881-1760 1880-3717
DOI:	10.2534/jjasnaoe.12.209
Popis:	It is clarified that fatigue crack propagation rate of the optimum ferrite-bainite (F/B) steel shows superior resistance in comparison with conventional ferrite-pearlite (F/P) steel. In this study, fatigue crack propagation properties of both F/P steel and the F/B steel are investigated in consideration of opening/closure of fatigue crack tip. Fatigue crack propagation tests have been carried out under various loading conditions ( constant amplitude cyclic loading, block amplitude cyclic loading and constant amplitude cyclic loading and a few static large spike loads ) for acceleration, retardation and non-propagation of crack growth rate. From the results of this study, fatigue crack propagation phenomena are shown in hysteresis loop for fatigue crack tip, and fatigue crack growth retardation and non-propagation bring long tail of hysteresis loop for fatigue crack tip. And effects of retardation in the F/B steel are larger than that in F/P steel.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c73ad525e27a1dafa88e867ff267fe20 https://doi.org/10.2534/jjasnaoe.12.209 Zobrazit plný text záznamu