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Rubber material properties for computational modeling of powertrain dynamics
Zubík, Martin ; Svída, David (referee) ; Novotný, Pavel (advisor)
The thesis provides a view on the problems of describing rubber dynamic properties and its determination. It summarises basic tendency of their dependences on frequency, loading amplitude and temperature as well as their interrelations. It also presents contemporary approach to generalized viscoelastic models of rubber materials and suggests the ways of obtaining their parameters by comparing the measured response of viscoelastic model body and its response calculated by using FEM.
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Simulation of collagen solution flow in rectangular capillary
Kysela, Bohuš ; Skočilas, J. ; Zitny, R. ; Stancl, J. ; Houska, M. ; Landfeld, A.
The viscoelastic properties of foods and polymers can be evaluated from flow of the material in capillary with specified dimension and shape. The extrusion rheometer equipped by capillary with rectangular cross-section was used for determination of the rheological behaviour of water collagen solution. The measurements of the axial profiles in longitudinal direction of the total stresses at capillary wall were performed for various shear rates. The linear viscoelastic model of Oldroyd B type: White-Metzner model was used for simulation of fluid flow in OpenFOAM software package. The simulations describe the effect of relaxation time on wall total stress in convergent-divergent capillary.
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Rubber material properties for computational modeling of powertrain dynamics
Zubík, Martin ; Svída, David (referee) ; Novotný, Pavel (advisor)
The thesis provides a view on the problems of describing rubber dynamic properties and its determination. It summarises basic tendency of their dependences on frequency, loading amplitude and temperature as well as their interrelations. It also presents contemporary approach to generalized viscoelastic models of rubber materials and suggests the ways of obtaining their parameters by comparing the measured response of viscoelastic model body and its response calculated by using FEM.
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