Very high frequency induced fatigue damage

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F24%3A00588417" target="_blank" >RIV/68081723:_____/24:00588417 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0167844224003409?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0167844224003409?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.tafmec.2024.104590" target="_blank" >10.1016/j.tafmec.2024.104590</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Very high frequency induced fatigue damage

Popis výsledku v původním jazyce

Fatigue lifetime and fatigue endurance limit are enhanced by the increased strain rate for many materials. Consequently, ultrasonic fatigue testing yields an S-N curve well above the conventionally obtained ones for the strain rate sensitive materials. Thus, understanding of the fatigue damage mechanisms operating under very high frequencies and their relation to the conventional testing results is crucial for lifetime prediction in the very high cycle fatigue region. he increase in test frequency from 20 Hz to 20 kHz enhances the fatigue life and the fatigue endurance limit of the ferritic-pearlitic structure steel. On the other hand, the character of the created surface relief was similar for all the test conditions in terms of test frequency and stress amplitude applied. The increased testing frequency reduced the number of slip markings. Nevertheless, it seems that test frequency only slightly impacted the height/depth of the extrusions/intrusions. Focused ion beam tomography and 3D reconstruction of the volume below the slip markings demonstrated the cavity distribution within the material volume and along the slip plane. No slip markings were observed in the pearlite areas. Fatigue crack initiation occurred predominantly in the slip markings, however, subsurface cavity-assisted crack initiation was occasionally observed, too. Coalescence of cavities along the slip plane facilitated the fatigue crack initiation and early growth. No difference in damage mechanism was detected regardless of the test frequency or stress amplitude.

Název v anglickém jazyce

Very high frequency induced fatigue damage

Popis výsledku anglicky

Fatigue lifetime and fatigue endurance limit are enhanced by the increased strain rate for many materials. Consequently, ultrasonic fatigue testing yields an S-N curve well above the conventionally obtained ones for the strain rate sensitive materials. Thus, understanding of the fatigue damage mechanisms operating under very high frequencies and their relation to the conventional testing results is crucial for lifetime prediction in the very high cycle fatigue region. he increase in test frequency from 20 Hz to 20 kHz enhances the fatigue life and the fatigue endurance limit of the ferritic-pearlitic structure steel. On the other hand, the character of the created surface relief was similar for all the test conditions in terms of test frequency and stress amplitude applied. The increased testing frequency reduced the number of slip markings. Nevertheless, it seems that test frequency only slightly impacted the height/depth of the extrusions/intrusions. Focused ion beam tomography and 3D reconstruction of the volume below the slip markings demonstrated the cavity distribution within the material volume and along the slip plane. No slip markings were observed in the pearlite areas. Fatigue crack initiation occurred predominantly in the slip markings, however, subsurface cavity-assisted crack initiation was occasionally observed, too. Coalescence of cavities along the slip plane facilitated the fatigue crack initiation and early growth. No difference in damage mechanism was detected regardless of the test frequency or stress amplitude.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/EH22_008%2F0004634" target="_blank" >EH22_008/0004634: Strojní inženýrství biologických a bioinspirovaných systémů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Theoretical and Applied Fracture Mechanics

ISSN

0167-8442

e-ISSN

1872-7638

Svazek periodika

133

Číslo periodika v rámci svazku

OCT

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

104590

Kód UT WoS článku

001282468600001

EID výsledku v databázi Scopus

2-s2.0-85199575214