Dislocation emission and crack growth in 3D bcc iron crystals under biaxial loading by atomistic simulations

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F19%3A00508315" target="_blank" >RIV/61388998:_____/19:00508315 - isvavai.cz</a>

Result on the web

<a href="https://aip.scitation.org/doi/pdf/10.1063/1.5109949?class=pdf" target="_blank" >https://aip.scitation.org/doi/pdf/10.1063/1.5109949?class=pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.5109949" target="_blank" >10.1063/1.5109949</a>

Result language

angličtina

Original language name

Dislocation emission and crack growth in 3D bcc iron crystals under biaxial loading by atomistic simulations

Original language description

This paper is devoted to the study of the ductile-brittle behavior of a central nanocrack (1¯10)[110] (crack plane/crack front) under biaxial loading via free 3D molecular dynamics (MD) simulations, as well as the comparison of MD results with continuum predictions concerning T-stress. The so called T-stress is a constant stress component acting along the crack plane, which should be considered (together with the stress intensity factor K) in the assessment of brittle-ductile behavior, namely, in the case of the short cracks. Previous 2D atomistic simulations under plane strain conditions indicated that the level of T-stress (controlled by the biaxiality ratio σB/σA from the external loading) affects dislocation emission from the crack and can cause the ductile-brittle transition. The plane strain simulations using the periodic or translational boundary conditions in the bcc lattice have certain limitations: they enable the in-plane dislocation emission (Burgers vector lies in the observation plane), but they do not allow the complete dislocation emission on the all slip systems favored by the shear stress. As presented, our new free 3D atomistic simulations (without periodic or symmetry conditions) enable the activity of the all favored slip systems. Thus, they offer a more realistic insight into the microscopic processes generated by the crack itself in dependence on the T-stress level.

Czech name

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Czech description

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Type

J_imp - 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

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

Journal of Applied Physics

ISSN

0021-8979

e-ISSN

—

Volume of the periodical

126

Issue of the periodical within the volume

7

Country of publishing house

US - UNITED STATES

Number of pages

11

Pages from-to

075115

UT code for WoS article

000483849000035

EID of the result in the Scopus database

2-s2.0-85071124624