Paradox of Shorter Residual Fatigue Life due to Omission of Low-Amplitude Cycles and Its Significance for Testing

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F25%3APU155738" target="_blank" >RIV/00216305:26210/25:PU155738 - isvavai.cz</a>

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/full/10.1111/ffe.14505?saml_referrer" target="_blank" >https://onlinelibrary.wiley.com/doi/full/10.1111/ffe.14505?saml_referrer</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/ffe.14505" target="_blank" >10.1111/ffe.14505</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Paradox of Shorter Residual Fatigue Life due to Omission of Low-Amplitude Cycles and Its Significance for Testing

Popis výsledku v původním jazyce

The work investigates nonvalidity of the common presumption that the nondamaging cycles do not influence residual fatigue life. Paradoxically, application of the full loading spectrum (more cycles) resulted in approximately 2.3 times longer life of the fatigue crack growth specimens than application of the spectrum with 33% of the smallest amplitudes omitted. Unlike in humid air (controlled relative humidity of 50% at 23 degrees C), the effect disappeared in a dry-air chamber (relative humidity <10% at 23 degrees C), where both fatigue lives were short. The mechanism responsible for these effects was identified as the oxide-induced crack closure, an extrinsic mechanism unrelated to material damage. Oxide debris developed on fracture surfaces was observed by light and scanning electron microscopy, whereas crack closure was measured during the experiments. The presented counterintuitive behavior in humid air may result in wrong assessment or prediction of components residual fatigue lives, which can be nonconservative in some scenarios.

Název v anglickém jazyce

Paradox of Shorter Residual Fatigue Life due to Omission of Low-Amplitude Cycles and Its Significance for Testing

Popis výsledku anglicky

The work investigates nonvalidity of the common presumption that the nondamaging cycles do not influence residual fatigue life. Paradoxically, application of the full loading spectrum (more cycles) resulted in approximately 2.3 times longer life of the fatigue crack growth specimens than application of the spectrum with 33% of the smallest amplitudes omitted. Unlike in humid air (controlled relative humidity of 50% at 23 degrees C), the effect disappeared in a dry-air chamber (relative humidity <10% at 23 degrees C), where both fatigue lives were short. The mechanism responsible for these effects was identified as the oxide-induced crack closure, an extrinsic mechanism unrelated to material damage. Oxide debris developed on fracture surfaces was observed by light and scanning electron microscopy, whereas crack closure was measured during the experiments. The presented counterintuitive behavior in humid air may result in wrong assessment or prediction of components residual fatigue lives, which can be nonconservative in some scenarios.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20306 - Audio engineering, reliability analysis

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Fatigue & Fracture of Engineering Materials & Structures

ISSN

8756-758X

e-ISSN

1460-2695

Svazek periodika

48

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

956-966

Kód UT WoS článku

001359768100001

EID výsledku v databázi Scopus

2-s2.0-85209626301