Shear instabilities in perfect bcc crystals during simulated tensile tests

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F13%3APU106141" target="_blank" >RIV/00216305:26620/13:PU106141 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.dpg-verhandlungen.de/year/2013/conference/regensburg/parts?lang=en" target="_blank" >http://www.dpg-verhandlungen.de/year/2013/conference/regensburg/parts?lang=en</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Shear instabilities in perfect bcc crystals during simulated tensile tests

Popis výsledku v původním jazyce

This work demonstrates a simple but efficient way how to determine the existence of shear instabilities in ideal bcc crystals under uniaxial loading. The theoretical tensile strengths are derived from calculated values of the theoretical shear strength and their dependence on the superimposed normal stress. The presented procedure enables us to avoid complicated and time-consuming analyses of elastic stability of crystals. Results of first-principles simulations of coupled shear and tensile deformationsfor two most frequent slip systems (mbox{textbraceleft}110mbox{textbraceright}$langle 111rangle$ and mbox{textbraceleft}112mbox{textbraceright}$langle 111rangle$) in six ideal cubic crystals are used to evaluate the uniaxial tensile strengths in three low-index crystallographic directions ($langle 100rangle$, $langle 110rangle$, and $langle 111rangle$) by assuming a shear instability in the weakest shear system. While instabilities occurring under $langle 100rangle$

Název v anglickém jazyce

Shear instabilities in perfect bcc crystals during simulated tensile tests

Popis výsledku anglicky

This work demonstrates a simple but efficient way how to determine the existence of shear instabilities in ideal bcc crystals under uniaxial loading. The theoretical tensile strengths are derived from calculated values of the theoretical shear strength and their dependence on the superimposed normal stress. The presented procedure enables us to avoid complicated and time-consuming analyses of elastic stability of crystals. Results of first-principles simulations of coupled shear and tensile deformationsfor two most frequent slip systems (mbox{textbraceleft}110mbox{textbraceright}$langle 111rangle$ and mbox{textbraceleft}112mbox{textbraceright}$langle 111rangle$) in six ideal cubic crystals are used to evaluate the uniaxial tensile strengths in three low-index crystallographic directions ($langle 100rangle$, $langle 110rangle$, and $langle 111rangle$) by assuming a shear instability in the weakest shear system. While instabilities occurring under $langle 100rangle$

Druh

O - Ostatní výsledky

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/ED1.1.00%2F02.0068" target="_blank" >ED1.1.00/02.0068: CEITEC - central european institute of technology</a><br>

Návaznosti

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

Rok uplatnění

2013

Kód důvěrnosti údajů

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