Fracture toughness of Fe-Si single crystals in mode I: Effect of loading rate on an edge crack (-110)[110] at macroscopic and atomistic level

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F22%3A00560649" target="_blank" >RIV/61388998:_____/22:00560649 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/22:00560649

Výsledek na webu

<a href="https://aip.scitation.org/doi/full/10.1063/5.0101626" target="_blank" >https://aip.scitation.org/doi/full/10.1063/5.0101626</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0101626" target="_blank" >10.1063/5.0101626</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Fracture toughness of Fe-Si single crystals in mode I: Effect of loading rate on an edge crack (-110)[110] at macroscopic and atomistic level

Popis výsledku v původním jazyce

This paper is devoted to an experimental and 3D atomistic study of the influence of loading rate on fracture toughness in dilute Fe-Si alloys and in bcc iron. We analyze new and previous experimental results from fracture tests performed at room temperature on bcc ironsilicon single crystals with edge cracks (110) [110] (crack plane/crack front). The specimens of SEN (single edge notch) type were loaded in tension mode I under different loading rates. The ductile-brittle behavior at the crack front was monitored on-line via optical microscopy together with external force and prolongation of the specimens. About 30% decrease in fracture toughness was monitored in the new experiment under the highest loading rate. The nanoscopic processes produced by the crack itself were studied at room temperature via 3D molecular dynamic (MD) simulations in bcc iron under equivalent boundary conditions as in experiments to reveal (explain) the sensitivity of the crack to loading rate. For this purpose, this MD study utilizes the self-similar character of linear fracture mechanics. The results show that the emission of blunting dislocations from the crack is the most difficult under the highest loading rate, which leads to the reduced fracture toughness of the atomistic sample. This is in a qualitative agreement with the experimental (macro) results. Moreover, MD indicates that there may be some synenergetic (resonant) effect between the loading rate and thermal activation that promotes dislocation emission.

Název v anglickém jazyce

Fracture toughness of Fe-Si single crystals in mode I: Effect of loading rate on an edge crack (-110)[110] at macroscopic and atomistic level

Popis výsledku anglicky

This paper is devoted to an experimental and 3D atomistic study of the influence of loading rate on fracture toughness in dilute Fe-Si alloys and in bcc iron. We analyze new and previous experimental results from fracture tests performed at room temperature on bcc ironsilicon single crystals with edge cracks (110) [110] (crack plane/crack front). The specimens of SEN (single edge notch) type were loaded in tension mode I under different loading rates. The ductile-brittle behavior at the crack front was monitored on-line via optical microscopy together with external force and prolongation of the specimens. About 30% decrease in fracture toughness was monitored in the new experiment under the highest loading rate. The nanoscopic processes produced by the crack itself were studied at room temperature via 3D molecular dynamic (MD) simulations in bcc iron under equivalent boundary conditions as in experiments to reveal (explain) the sensitivity of the crack to loading rate. For this purpose, this MD study utilizes the self-similar character of linear fracture mechanics. The results show that the emission of blunting dislocations from the crack is the most difficult under the highest loading rate, which leads to the reduced fracture toughness of the atomistic sample. This is in a qualitative agreement with the experimental (macro) results. Moreover, MD indicates that there may be some synenergetic (resonant) effect between the loading rate and thermal activation that promotes dislocation emission.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Journal of Applied Physics

ISSN

0021-8979

e-ISSN

1089-7550

Svazek periodika

132

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

065107

Kód UT WoS článku

000839458400004

EID výsledku v databázi Scopus

2-s2.0-85136926691