A NEW CONSTITUTIVE EQUATION FOR VISCOELASTIC MATERIALS AND ITS PERFORMANCE IN AN ABRUPT CONTRACTION / UMA NOVA EQUAÇÃO CONSTITUTIVA PARA MATERIAIS VISCOELÁSTICOS E SEU DESEMPENHO EM CONTRAÇÃO ABRUPTA 4:1

AUTOR(ES)

RONEY LEON THOMPSON

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

01/04/1997

RESUMO

A new constitutive equation for the stress tensor is proposed. This equation allows fitting os stationary shear and elongational material functions experimental data due to the total discoupling of these functions. A local kinematic criteria of classifying flows is used in order to capture the influence of rigid body motion, pure shear flows and shear free flows to intermediate regions where the kinematics characteristics are in between these limit cases, making easy the analysis of complex flows. The model was tested in a 4 for 1 abrupt contraction and some results were in good agreement with literature, like the vortex growth with increasing extensional power law index and the countrary effects of elastic and extensional propertys. The effects of changing a purely elastic property was studied for the first time, because tipical models cant isolate this effect.

ASSUNTO(S)

viscoelasticidade viscoelasticity equacao equation

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