Fatigue Crack Growth Rates for Ferritic Steels Under Negative R Ratio

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

Fatigue Crack Growth Rates for Ferritic Steels Under Negative R Ratio

Original language description

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.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

JG - Metallurgy, metal materials

OECD FORD branch

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Project

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Continuities

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Publication year

2016

Confidentiality

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

Article name in the collection

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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Number of pages

6

Pages from-to

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Publisher name

American Society of Mechanical Engineers

Place of publication

Fairfield

Event location

Vancouver

Event date

Jul 17, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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