Definition of fatigue crack growth thresholds for ferritic steels in fitness-for-service codes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27690%2F18%3A10241972" target="_blank" >RIV/61989100:27690/18:10241972 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27690/18:10241974

Výsledek na webu

<a href="http://dx.doi.org/10.1115/PVP201884940" target="_blank" >http://dx.doi.org/10.1115/PVP201884940</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1115/PVP201884940" target="_blank" >10.1115/PVP201884940</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Definition of fatigue crack growth thresholds for ferritic steels in fitness-for-service codes

Popis výsledku v původním jazyce

Fatigue crack growth rates are expressed as a function of the stress intensity factor ranges. The fatigue crack growth thresholds are important characteristics of fatigue crack growth assessment for the integrity of structural components. Almost all materials used in these fatigue tests are ferritic steels. As a result, the reference fatigue crack growth rates and the fatigue crack growth thresholds for ferritic steels were established as rules and they were provided by many fitness-for-service (FFS) codes. However, the thresholds are not well defined in the range of negative stress ratio. There are two types of thresholds under the negative stress ratio. That is, constant thresholds and increment of thresholds with decreasing stress ratios. The objective of this paper is to introduce the thresholds provided by FFS codes and to analyze the thresholds using crack closure. In addition, based on the experimental data, definition of the threshold is discussed to apply to FFS codes. Finally, threshold for ferritic steels under the entirely condition of stress ratio is proposed to the ASME Code Section XI. Copyright (C) 2018 ASME.

Název v anglickém jazyce

Definition of fatigue crack growth thresholds for ferritic steels in fitness-for-service codes

Popis výsledku anglicky

Fatigue crack growth rates are expressed as a function of the stress intensity factor ranges. The fatigue crack growth thresholds are important characteristics of fatigue crack growth assessment for the integrity of structural components. Almost all materials used in these fatigue tests are ferritic steels. As a result, the reference fatigue crack growth rates and the fatigue crack growth thresholds for ferritic steels were established as rules and they were provided by many fitness-for-service (FFS) codes. However, the thresholds are not well defined in the range of negative stress ratio. There are two types of thresholds under the negative stress ratio. That is, constant thresholds and increment of thresholds with decreasing stress ratios. The objective of this paper is to introduce the thresholds provided by FFS codes and to analyze the thresholds using crack closure. In addition, based on the experimental data, definition of the threshold is discussed to apply to FFS codes. Finally, threshold for ferritic steels under the entirely condition of stress ratio is proposed to the ASME Code Section XI. Copyright (C) 2018 ASME.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

ASME 2018 Pressure Vessels &amp; Piping Conference (PVP2018) : July 15-20, 2018, Prague, Czech Republic

ISBN

978-0-7918-5158-6

ISSN

0277-027X

e-ISSN

neuvedeno

Počet stran výsledku

5

Strana od-do

—

Název nakladatele

ASME

Místo vydání

New York

Místo konání akce

Praha

Datum konání akce

15. 7. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—