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
The result's identifiers
Result code in 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>
Alternative codes found
RIV/68378271:_____/22:00560649
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
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
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Applied Physics
ISSN
0021-8979
e-ISSN
1089-7550
Volume of the periodical
132
Issue of the periodical within the volume
6
Country of publishing house
US - UNITED STATES
Number of pages
14
Pages from-to
065107
UT code for WoS article
000839458400004
EID of the result in the Scopus database
2-s2.0-85136926691