"Tokov\u00E9 chov\u00E1n\u00ED nov\u00FDch materi\u00E1l\u016F, kter\u00E9 maj\u00ED zpravidla slo\u017Eitou vnit\u0159n\u00ED strukturu, se p\u0159i zpracov\u00E1n\u00ED st\u00E1v\u00E1 natolik komplexn\u00EDm, \u017Ee je velmi obt\u00ED\u017En\u00E9 optimalizovat jednotliv\u00E9 v\u00FDrobn\u00ED procesy. Hlavn\u00EDm d\u016Fvodem je skute\u010Dnost, \u017Ee b\u011B\u017En\u011B pou\u017E\u00EDvan\u00E9 konstitutivn\u00ED rovnice nejsou schopny charakterizovat a popsat reologick\u00E9 projevy t\u011Bchto materi\u00E1l\u016F s takovou p\u0159esnost\u00ED, aby bylo mo\u017Eno vyu\u017E\u00EDt jejich prediktivn\u00EDch a kvantifika\u010Dn\u00EDch schopnost\u00ED pro optimalizaci dan\u00E9ho procesu pomoc\u00ED matematick\u00E9ho modelov\u00E1n\u00ED. Z toho d\u016Fvodu si p\u0159edkl\u00E1dan\u00FD projekt klade za c\u00EDl: odvozen\u00ED nov\u00E9ho fenomenologick\u00E9ho modelu vhodn\u00E9ho pro popis \u0161irok\u00E9 t\u0159\u00EDdy viskoelastick\u00FDch materi\u00E1l\u016F vykazuj\u00EDc\u00EDch nemonot\u00F3nn\u00ED z\u00E1vislost viskozity na deforma\u010Dn\u00EDch charakteristik\u00E1ch, dan\u00FD model by m\u011Bl b\u00FDt dostate\u010Dn\u011B pru\u017En\u00FD, aby postihl i chov\u00E1n\u00ED v okol\u00ED extr\u00E9mn\u00EDch bod\u016F (maxima, minima) a spr\u00E1vn\u011B charakterizoval i newtonsk\u00E9 \u00FAseky (v\u010Detn\u011B p\u0159\u00EDpadn\u011B mezilehl\u00E9ho); zejm\u00E9na bude minimalizov\u00E1n po\u010Det parametr\u016F modelu a voleny takov\u00E9 funkcion\u00E1ln\u00ED vztahy, kter\u00E9" . . . . "http://www.isvav.cz/projectDetail.do?rowId=GA103/05/2311"^^ . "rheological models" . . "0"^^ . . "Development of methematical models for description of complex fluids rheology"@en . . "1"^^ . . . . "1"^^ . "Byla provedena kvalitativn\u00ED anal\u00FDza vybran\u00FDch diferenci\u00E1ln\u00EDch konstitutivn\u00EDch model\u016F (XPP, PTT-XPP a modifikovan\u00FD Leonov\u016Fv model) s ohledem na predikci tokov\u00E9ho chov\u00E1n\u00ED polymern\u00EDch materi\u00E1l\u016F a posouzen\u00ED mo\u017Enosti zp\u011Btn\u00E9ho stanoven\u00ED struktur\u00E1ln\u00EDch charakte"@cs . . "GA103/05/2311" . . "2008-12-16+01:00"^^ . . "V\u00FDvoj matematick\u00FDch model\u016F pro reologick\u00FD popis kapalin se slo\u017Eitou vnit\u0159n\u00ED strukturou" . "2007-05-02+02:00"^^ . . . "2005-01-01+01:00"^^ . . "2007-12-31+01:00"^^ . "20"^^ . "The selected differential constitutive models (XPP, PTT-XPP, and modified Leonov models) were analysed with the aim to evaluate both, their predicting/fitting capabilities and ability to determine the structural characteristics of macromolecular chains ("@en . "20"^^ . " constitutive equations" . . "rheological models; constitutive equations; viscosity"@en . . "A wide variety of new industrially used or produced materials and products is expected to exhibit tailor-made flow properties of the final product and fulfil the requirements of desired final performance. Control of such properties usually depends on theknowledge of process variables as well as on the ability to measure and mathematically characterise meaningful flow properties information. Constitutive models represent one of the basic points for characterisation of materials behaviour and consecutive description of flow for the given geometrical arrangements. The aim of the proposed project is to present a new phenomenological rheological model suitable for the description of a wide class of viscoelastic fluids that exhibit nonmonotonous dependenceof viscosity on deformation characteristics, this model should be sufficiently flexible to respect local extremes (maximum, minimum) and Newtonian plateau including an intermediate one; a number of entry parameters will be minimised; to modify and"@en . .