PROPOSAL OF NEGATIVE STRESS RATIO R FOR FATIGUE CRACK GROWTH RATES OF AUSTENITIC STAINLESS STEELS IN AIR FOR ASME CODE SECTION XI BASED ON TREND IN EXPERIMENTAL DATA

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F24%3A10256757" target="_blank" >RIV/61989100:27360/24:10256757 - isvavai.cz</a>

Result on the web

<a href="https://asmedigitalcollection.asme.org/PVP/proceedings-abstract/PVP2024/88476/V001T01A025/1209331" target="_blank" >https://asmedigitalcollection.asme.org/PVP/proceedings-abstract/PVP2024/88476/V001T01A025/1209331</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1115/PVP2024-122614" target="_blank" >10.1115/PVP2024-122614</a>

Result language

angličtina

Original language name

PROPOSAL OF NEGATIVE STRESS RATIO R FOR FATIGUE CRACK GROWTH RATES OF AUSTENITIC STAINLESS STEELS IN AIR FOR ASME CODE SECTION XI BASED ON TREND IN EXPERIMENTAL DATA

Original language description

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 increasing the ratio R, and da/dN increases with increasing stress ratio R. When R is less than 0, SR = 1. Accordingly, fatigue crack growth rates under negative stress ratios are independent of stress ratios. This means that a cyclic stress state with a minimum that is compressive is considered to cause the same degree of crack growth as one with the same range but a zero minimum. 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. 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.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/EF17_048%2F0007373" target="_blank" >EF17_048/0007373: Damage Prediction of Structural Materials</a><br>

Continuities

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

Publication year

2024

Confidentiality

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

Article name in the collection

Proceedings of ASME 2024 Pressure Vessels &amp;amp; Piping Conference, PVP2024. Volume 1. July 28-August 2, 2024 Bellevue, Washington

ISBN

978-0-7918-8847-6

ISSN

0277-027X

e-ISSN

0277-027X

Number of pages

8

Pages from-to

203947

Publisher name

American Society of Mechanical Engineers

Place of publication

New York

Event location

Bellevue

Event date

Jul 28, 2024

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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