About: Mechanical stability of cubic crystals under hydrostatic and uniaxial loading

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Theoretical strength corresponds to a stress associated with failure of a crystal lattice, i.e., with the first occurrence of mechanical instability. Its value sets an upper limit of attainable stresses in a solid crystal without defects and imperfections. The goal of this study is to advance our fundamental understanding of microscopic mechanisms that limit region of mechanical stability of fcc Ni and fcc Ir under hydrostatic (isotropic) and uniaxial [001] loading. The stability is assessed by analysing phonon spectra that are calculated for different values of strain from first principles. Two methods (linear response method and supercell method) are employed for computation of phonon dispersion curves and their results are compared. A relevant analysis of elastic stability conditions is also performed. Although most of the previous studies of isotropic loading predicted that first instabilities in crystals correspond to macroscopic (elastic) instabilities we found soft phonons of finite wave vector Theoretical strength corresponds to a stress associated with failure of a crystal lattice, i.e., with the first occurrence of mechanical instability. Its value sets an upper limit of attainable stresses in a solid crystal without defects and imperfections. The goal of this study is to advance our fundamental understanding of microscopic mechanisms that limit region of mechanical stability of fcc Ni and fcc Ir under hydrostatic (isotropic) and uniaxial [001] loading. The stability is assessed by analysing phonon spectra that are calculated for different values of strain from first principles. Two methods (linear response method and supercell method) are employed for computation of phonon dispersion curves and their results are compared. A relevant analysis of elastic stability conditions is also performed. Although most of the previous studies of isotropic loading predicted that first instabilities in crystals correspond to macroscopic (elastic) instabilities we found soft phonons of finite wave vector (en)
Title	Mechanical stability of cubic crystals under hydrostatic and uniaxial loading Mechanical stability of cubic crystals under hydrostatic and uniaxial loading (en)
skos:prefLabel	Mechanical stability of cubic crystals under hydrostatic and uniaxial loading Mechanical stability of cubic crystals under hydrostatic and uniaxial loading (en)
skos:notation	RIV/00216305:26210/14:PU112630!RIV15-MSM-26210___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(ED1.1.00/02.0068)
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Řehák, Petr Černý, Miroslav
http://linked.open.../riv/druhVysledku	O - Ostatní výsledky nezařaditelné do žádného z výše uvedených druhů výsledku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoké učení technické v Brně / Fakulta strojního inženýrství
http://linked.open...dnocenehoVysledku	28089
http://linked.open...ai/riv/idVysledku	RIV/00216305:26210/14:PU112630
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	ab initio calculations, elastic stability, phonon instability, theoretical strength, hydrostatic loading, uniaxial loading (en)
http://linked.open.../riv/klicoveSlovo	hydrostatic loading uniaxial loading ab initio calculations theoretical strength phonon instability elastic stability
http://linked.open...ontrolniKodProRIV	[206CF3119F5E]
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Central european institute of technology
http://linked.open...UplatneniVysledku	2014
http://linked.open...iv/tvurceVysledku	Černý, Miroslav Řehák, Petr Šob, Mojmír
http://localhost/t...ganizacniJednotka	26210

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