Fatigue Crack Growth Rates for Ferritic Steels Under Negative R Ratio

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27690%2F16%3A86100046" target="_blank" >RIV/61989100:27690/16:86100046 - isvavai.cz</a>

Výsledek na webu

<a href="http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=2590077" target="_blank" >http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=2590077</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1115/PVP2016-63872" target="_blank" >10.1115/PVP2016-63872</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Fatigue Crack Growth Rates for Ferritic Steels Under Negative R Ratio

Popis výsledku v původním jazyce

Reference curves of fatigue crack growth rates for ferritic steels in air environment are provided by the ASME Code Section XI Appendix A. The fatigue crack growth rates under negative R ratio are given as da/dN vs. Kmax, It is generally well known that the growth rates decreases with decreasing R ratios. However, the da/dN as a function of Kmax are the same curves under R = 0, MINUS SIGN 1 and MINUS SIGN 2. In addition, the da/dN increases with decreasing R ratio for R < MINUS SIGN 2. This paper converts from da/dN vs. Kmax to da/dN vs. ΔKI, using crack closure U. It can be obtained that the growth rates da/dN as a function of ΔKI decrease with decreasing R ratio for MINUS SIGN 2 LESS-THAN OR EQUAL TO R < 0. It can be seen that the growth rate da/dN vs. ΔKI is better equation than da/dN vs. Kmax from the view point of stress ratio R. Furthermore, extending crack closure U to R = MINUS SIGN 5, it can be explained that the da/dN decreases with decreasing R ratio in the range of MINUS SIGN 5 LESS-THAN OR EQUAL TO R < 0. This tendency is consistent with the experimental data.

Název v anglickém jazyce

Fatigue Crack Growth Rates for Ferritic Steels Under Negative R Ratio

Popis výsledku anglicky

Reference curves of fatigue crack growth rates for ferritic steels in air environment are provided by the ASME Code Section XI Appendix A. The fatigue crack growth rates under negative R ratio are given as da/dN vs. Kmax, It is generally well known that the growth rates decreases with decreasing R ratios. However, the da/dN as a function of Kmax are the same curves under R = 0, MINUS SIGN 1 and MINUS SIGN 2. In addition, the da/dN increases with decreasing R ratio for R < MINUS SIGN 2. This paper converts from da/dN vs. Kmax to da/dN vs. ΔKI, using crack closure U. It can be obtained that the growth rates da/dN as a function of ΔKI decrease with decreasing R ratio for MINUS SIGN 2 LESS-THAN OR EQUAL TO R < 0. It can be seen that the growth rate da/dN vs. ΔKI is better equation than da/dN vs. Kmax from the view point of stress ratio R. Furthermore, extending crack closure U to R = MINUS SIGN 5, it can be explained that the da/dN decreases with decreasing R ratio in the range of MINUS SIGN 5 LESS-THAN OR EQUAL TO R < 0. This tendency is consistent with the experimental data.

Druh

D - Stať ve sborníku

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

—

Návaznosti

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP

ISBN

978-0-7918-5035-0

ISSN

0277-027X

e-ISSN

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Počet stran výsledku

6

Strana od-do

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Název nakladatele

American Society of Mechanical Engineers

Místo vydání

Fairfield

Místo konání akce

Vancouver

Datum konání akce

17. 7. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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