Development of Scaling Parameter SR for Negative Stress Ratios R Based on Trend in Experimental Data for Fatigue Crack Growth Rates of Austenitic Stainless Steels for ASME Code Section XI

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F25%3A10257478" target="_blank" >RIV/61989100:27360/25:10257478 - isvavai.cz</a>

Výsledek na webu

<a href="https://asmedigitalcollection.asme.org/pressurevesseltech/article-abstract/147/2/021201/1210949/Development-of-Scaling-Parameter-SR-for-Negative?redirectedFrom=fulltext" target="_blank" >https://asmedigitalcollection.asme.org/pressurevesseltech/article-abstract/147/2/021201/1210949/Development-of-Scaling-Parameter-SR-for-Negative?redirectedFrom=fulltext</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1115/1.4067484" target="_blank" >10.1115/1.4067484</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Development of Scaling Parameter SR for Negative Stress Ratios R Based on Trend in Experimental Data for Fatigue Crack Growth Rates of Austenitic Stainless Steels for ASME Code Section XI

Popis výsledku v původním jazyce

Fatigue crack growth rates da/dN for stainless steels in air environment are provided by the ASME Code Section XI. The fatigue crack growth rates are given by da/dN = CF(ΔK)n, where CF is the fatigue crack growth rate coefficient, n is the fatigue crack growth rate exponent and ΔK is the stress intensity factor range. The coefficient CF contains a temperature parameter ST, and a scaling parameter SR, which is a function of the stress ratio R. When the stress ratio R is positive from 0 to 1, the parameter SR increases with the increasing ratio R, and da/dN increases with the increasing stress ratio R. When R is less than 0, SR = 1. Hence, fatigue crack growth rates under negative stress ratios are independent of stress ratios according to the ASME Code Section XI. However, from the results of literature survey, experimental data reveal that the fatigue crack growth rates decrease with decreasing R ratios below zero, i.e., negative stress ratios, when being expressed by da/dN = CF(ΔK)n, where ΔK is the full range of the stress intensity factor. The objective of this paper is to assess fatigue crack growth rates under such negative stress ratios for stainless steels in air environment. An equation determined from trends in experimental data surveyed in this study is proposed for negative R ratios to calculate the parameter SR for the ASME Code Section XI, Appendix Y.

Název v anglickém jazyce

Development of Scaling Parameter SR for Negative Stress Ratios R Based on Trend in Experimental Data for Fatigue Crack Growth Rates of Austenitic Stainless Steels for ASME Code Section XI

Popis výsledku anglicky

Fatigue crack growth rates da/dN for stainless steels in air environment are provided by the ASME Code Section XI. The fatigue crack growth rates are given by da/dN = CF(ΔK)n, where CF is the fatigue crack growth rate coefficient, n is the fatigue crack growth rate exponent and ΔK is the stress intensity factor range. The coefficient CF contains a temperature parameter ST, and a scaling parameter SR, which is a function of the stress ratio R. When the stress ratio R is positive from 0 to 1, the parameter SR increases with the increasing ratio R, and da/dN increases with the increasing stress ratio R. When R is less than 0, SR = 1. Hence, fatigue crack growth rates under negative stress ratios are independent of stress ratios according to the ASME Code Section XI. However, from the results of literature survey, experimental data reveal that the fatigue crack growth rates decrease with decreasing R ratios below zero, i.e., negative stress ratios, when being expressed by da/dN = CF(ΔK)n, where ΔK is the full range of the stress intensity factor. The objective of this paper is to assess fatigue crack growth rates under such negative stress ratios for stainless steels in air environment. An equation determined from trends in experimental data surveyed in this study is proposed for negative R ratios to calculate the parameter SR for the ASME Code Section XI, Appendix Y.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20500 - Materials engineering

Projekt

<a href="/cs/project/EF17_048%2F0007373" target="_blank" >EF17_048/0007373: Predikce poškození konstrukčních materiálů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Journal of Pressure Vessel Technology, Transactions of the ASME

ISSN

0094-9930

e-ISSN

1528-8978

Svazek periodika

147

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

021201

Kód UT WoS článku

001437262800004

EID výsledku v databázi Scopus

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