Fatigue cracks in Eurofer 97 steel: Part II. Comparison of small and long fatigue crack growth

0359061 - ÚFM 2012 RIV NL eng J - Journal Article
Kruml, Tomáš - Hutař, Pavel - Náhlík, Luboš - Seitl, Stanislav - Polák, Jaroslav
Fatigue cracks in Eurofer 97 steel: Part II. Comparison of small and long fatigue crack growth.
Journal of Nuclear Materials. Roč. 412, 1 (2011), s. 7-12. ISSN 0022-3115. E-ISSN 1873-4820
R&D Projects: GA ČR GA106/09/1954; GA ČR GA101/09/0867
Institutional research plan: CEZ:AV0Z20410507
Keywords : ferritic-martensitic steel * long crack growth * small crack growth * crack closure
Subject RIV: JL - Materials Fatigue, Friction Mechanics
Impact factor: 2.052, year: 2011

The fatigue crack growth rate in the Eurofer 97 steel at room temperature was measured by two different methodologies. Small crack growth data were obtained using cylindrical specimens with a shallow notch and no artificial crack starters. The growth of semicircular cracks of length between 10–2000 lm was followed in symmetrical cycling with constant strain amplitude (Re = 1). Long crack data were measured using standard CT specimen and ASTM methodology, i.e. R = 0.1. The growth of cracks having the length in the range of 10–30 mm was measured. It is shown that the crack growth rates of both types of cracks are in a very good agreement if J-integral representation is used and usual assumptions of the crack closure effects are taken into account.
Permanent Link: http://hdl.handle.net/11104/0196930