Near-Threshold Fatigue Crack Growth Behavior of SUS304 Steel at High Temperatures Using Interferometric Strain/Displacement Gage. 2nd Report, Fatigue Crack Growth Behavior

Autor:	Shoji Shiotani, Hisanori Enoki, Kiyotsugu Ohji, T.A.P. Kacou, Eiichi Tamura, Yoshikazu Nakai, Shiro Kubo
Rok vydání:	1999
Předmět:	Materials science Strain (chemistry) business.industry Mechanical Engineering Effective stress Fracture mechanics Structural engineering Paris' law Crack growth resistance curve Crack closure General Materials Science Composite material business Displacement (fluid) Stress intensity factor
Zdroj:	JSME International Journal Series A. 42:97-103
ISSN:	1347-5363 1344-7912
DOI:	10.1299/jsmea.42.97
Popis:	Fatigue crack growth tests were conducted at 450, 550, 650 and 700 (°C) using type 304 stainless steel. Crack closure level was measured using the interferometric strain/ displacement gage (I.S.D.G.), described in the previous paper. Crack growth rates for stress ratio R= -0.1 plotted against stress intensity factor range, ΔK. deviated from those for R=0.5, Using the effective stress intensity factor range, ΔK eff and effective J integral range, ΔJ f,eff, which were calculated using crack opening ratio determined from the I.S.D.G. measurement, the crack growth behaviors for R=0.1 and 0.5 were reconciled at each test temperature. A threshold value, ΔK eff,th, of fatigue crack growth was determined at each temperature investigated. It was found that the threshold value reached a maximum at a temperature between 450 and 550 (°C).
Databáze:	OpenAIRE
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