"Alexandroupolis" . "Ab initio calculations of elastic moduli and theoretical uniaxial strength of composite lamina having continuous nano-fibre reinforcements are performed using pseudo-potential plane-wave code. Obtained results are used to verify validity of macro-scale empirical relations for composites (rules of mixtures) on the nano-scale. All quantities are computed from the dependence of crystal energy on a suitable deformation parameter. Results for tungsten nano-fibres in niobium matrix, presented as a particularexample of the ab-initio analysis, reveal that bulk moduli of ideal composites follow the simplest form of the linear mixture rule. On the other hand, Young moduli and theoretical strengths exhibit linear dependence on tungsten atomic concentration onlytill 80% concentration is reached." . . "Ab initio v\u00FDpo\u010Dty elastick\u00FDch modul\u016F a teoretick\u00E9 tahov\u00E9 pevnosti komposit\u016F s nanovl\u00E1knovou v\u00FDztu\u017E\u00ED jsou provedeny pomoc\u00ED pseudo-potenci\u00E1lov\u00E9ho k\u00F3du s b\u00E1z\u00ED rovinn\u00FDch vln. Z\u00EDskan\u00E9 v\u00FDsledky jsou pou\u017Eity k ov\u011B\u0159en\u00ED platnosti empirick\u00FDch vztah\u016F pro maktroskopick\u00E9 komposity (sm\u011B\u0161ovac\u00ED pravidla) na nano-\u00FArovni. V\u0161echny veli\u010Diny jsou po\u010D\u00EDt\u00E1ny ze z\u00E1vislosti tot\u00E1ln\u00ED energie krystalu na vhodn\u00E9m parametru deformace. V\u00FDsledky pro wolframov\u00E1 vl\u00E1kna v niobov\u00E9 matrici, uveden\u00E1 jako p\u0159\u00EDklad ab-initio anal\u00FDzy, odhalila,\u017Ee modul objemov\u00E9 pru\u017Enosti ide\u00E1ln\u00EDho kompozitu spl\u0148uje line\u00E1rn\u00ED sm\u011B\u0161ovac\u00ED pravidlo. Na druhou stranu, Young\u016Fv modul a teoretick\u00E1 pevnost jev\u00ED line\u00E1rn\u00ED z\u00E1vislost na koncentraci wolframu pouze do dosa\u017Een\u00ED 80% koncentrace."@cs . . . "2006-07-03+02:00"^^ . "Ab initio calculations of elastic moduli and theoretical uniaxial strength of composite lamina having continuous nano-fibre reinforcements are performed using pseudo-potential plane-wave code. Obtained results are used to verify validity of macro-scale empirical relations for composites (rules of mixtures) on the nano-scale. All quantities are computed from the dependence of crystal energy on a suitable deformation parameter. Results for tungsten nano-fibres in niobium matrix, presented as a particularexample of the ab-initio analysis, reveal that bulk moduli of ideal composites follow the simplest form of the linear mixture rule. On the other hand, Young moduli and theoretical strengths exhibit linear dependence on tungsten atomic concentration onlytill 80% concentration is reached."@en . "6"^^ . . "2"^^ . . "Ab initio studie pru\u017Enosti a pevnosti nanovl\u00E1knov\u00FDch kompozit\u016F"@cs . . . . "1-4020-4971-4" . "[962ABC100031]" . "2"^^ . "Ab initio Study of Elasticity and Strength of Nano-fibre Reinforced Composites"@en . "P(GA101/05/0320)" . "Ab initio studie pru\u017Enosti a pevnosti nanovl\u00E1knov\u00FDch kompozit\u016F"@cs . . . . "Fracture of Nano and Engineering Materials and Structures" . . "\u010Cern\u00FD, Miroslav" . . "Pokluda, Jaroslav" . "RIV/00216305:26210/06:PU59405!RIV06-GA0-26210___" . "873-878" . . "RIV/00216305:26210/06:PU59405" . . . . . . "Ab initio Study of Elasticity and Strength of Nano-fibre Reinforced Composites" . "nano-fibre composites, ab initio calculations, rules of mixtures, elastic moduli, uniaxial strength"@en . "Ab initio Study of Elasticity and Strength of Nano-fibre Reinforced Composites"@en . "Springer-Verlag" . "Ab initio Study of Elasticity and Strength of Nano-fibre Reinforced Composites" . "26210" . "Alexandroupolis" . "463926" .