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  • Výpočty modulů pružnosti a teoretické pevnosti v jednoosém tahu kompozitu se spojitou nanovláknovou výztuží jsou provedeny prostřednictvím ab initio metody. Všechny veličiny jsou počítány ze závislosti energie krystalu na vhodném deformačním parametru. Výsledky pro wolframová nanovlákna ve vanadové matrici jsou uvedeny jako konkrtétní příklad ab initio analýzy. Závislost modulů pružnosti ideálních kompozitů na atomové koncentraci W (přibližně odpovídající objemovému podílu vláken) je porovnána s nejjednodnodušší formou lineárních směšovacích pravidel pro ideální kompozit. Získané výsledky ukazují, že platnost lineárních směšovacích pravidel je teoreticky splněna pro většinu z nich. Na druhou stranu, vypočtené honoty teoretické pevnosti jeví rostoucí závislost na atomové koncentraci W jen do 70%. Pak dojde k jejich saturaci nebo dokonce poklesu. (cs)
  • Calculations of elastic moduli and theoretical uniaxial strength of unidirectional composite having continuous nano-fiber reinforcements are performed using ab initio method. All quantities are computed from the dependence of crystal energy on a suitable deformation parameter. Results for tungsten nano-fibers in vanadium matrix are presented as a particular example of the analysis. The dependence of the computed composite elastic moduli on the atomic concentration of W (nearly corresponding to the volume fraction of fibers) is compared with the rule of mixture for an ideal composite. Results show that validity of the linear mixture rule is theoretically justified for most of them. On the other hand, computed values of theoretical strength exhibit a simple increasing dependence on atomic concentration of W only up to about 70% concentration. Then the values become saturated or even slightly decrease.
  • Calculations of elastic moduli and theoretical uniaxial strength of unidirectional composite having continuous nano-fiber reinforcements are performed using ab initio method. All quantities are computed from the dependence of crystal energy on a suitable deformation parameter. Results for tungsten nano-fibers in vanadium matrix are presented as a particular example of the analysis. The dependence of the computed composite elastic moduli on the atomic concentration of W (nearly corresponding to the volume fraction of fibers) is compared with the rule of mixture for an ideal composite. Results show that validity of the linear mixture rule is theoretically justified for most of them. On the other hand, computed values of theoretical strength exhibit a simple increasing dependence on atomic concentration of W only up to about 70% concentration. Then the values become saturated or even slightly decrease. (en)
Title
  • First Principles Study of Vanadium Based Composites Reinforced by Tungsten Nano-fibers
  • First Principles Study of Vanadium Based Composites Reinforced by Tungsten Nano-fibers (en)
  • Prvoprncipiální studie vanadových kompositů vyztužených wolframovými nanovlákny (cs)
skos:prefLabel
  • First Principles Study of Vanadium Based Composites Reinforced by Tungsten Nano-fibers
  • First Principles Study of Vanadium Based Composites Reinforced by Tungsten Nano-fibers (en)
  • Prvoprncipiální studie vanadových kompositů vyztužených wolframovými nanovlákny (cs)
skos:notation
  • RIV/00216305:26210/06:PU63118!RIV07-MSM-26210___
http://linked.open.../vavai/riv/strany
  • 297-300
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(OC 148)
http://linked.open...vai/riv/dodaniDat
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  • 475924
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  • RIV/00216305:26210/06:PU63118
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  • ab inito calculations, nano-composites, theoretical strength (en)
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http://linked.open...ontrolniKodProRIV
  • [71ADA7439748]
http://linked.open...v/mistoKonaniAkce
  • Brno
http://linked.open...i/riv/mistoVydani
  • FSI VUT Brno
http://linked.open...i/riv/nazevZdroje
  • Nano 06
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
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http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...iv/tvurceVysledku
  • Pokluda, Jaroslav
  • Černý, Miroslav
http://linked.open...vavai/riv/typAkce
http://linked.open.../riv/zahajeniAkce
number of pages
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  • VUTIUM
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  • 80-214-3331-0
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  • 26210
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