National Repository of Grey Literature 6 records found  Search took 0.01 seconds. 
Reologická charakterizace LDPE materiálů pomocí diferenciálních konstitučních rovnic
Pivokonský, Radek ; Zatloukal, M. ; Filip, Petr
For rheological description of branched LDPE melts (Escorene LD165BW1 a Bralen RB0323) the following differential constitutive equations were used: eXtended Pom-Pom, Phan Thien-Tanner-XPP, and modified Leonov models. There was carried out quantitative and qualitative comparison of efficiency of the predictions determined by these models with the experimental data measured at 200oC. For both materials there were measured linear viscoelastic properties, shear and uniaxial extensional viscosities.
Vliv reakčního vytlačování na reologické vlastnosti metalocénových polypropylénů
Pivokonský, Radek ; Zatloukal, M. ; Filip, Petr ; Tzoganakis, C.
Constitutive equations represent a powerful tool for analysis and description of linear and branched polymer materials (even for polydisperse ones). Predictive/fitting capabilities of three constitutive models (eXtended Pom-Pom, PTT-XPP, and modified Leonov models) were examined using four standard industrial PE materials (two linear and two branched). All the materials were tested in both shear and uniaxial extensional flows (steady and transient).
Určování mechanických vlastností věnčitých tepen
Beneš, J. ; Horný, L. ; Konvičková, S. ; Chlup, Hynek
Samples of human coronary arteries underwent inflation tests to obtain parameters which characterize its mechanical behavior. A pressure-diameter relationship was determined. Strain energy density function was used to model constitutive behavior. Its numerical characterization was found by regression analysis of experimental data.
Mechanical Properties of Rheonomic Materials
Minster, Jiří
There are introduced with consideration for engineering applications, constitutive equations small and moderate deformation behaviour of both non-ageing and ageing rheonomic materials, basic methods for identification of their mechanical characteristics and possibilities of an ultimate behaviour assessment.

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