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Analiza procesu walcowania blach z zastosowaniem rozwiązań dla ciał lepkosprężystych

100%

Rydz D.

2009

tom Vol. 76, nr 5

348-351

W pracy przedstawiono i omówiono proces walcowania blach z zastosowaniem rozwiązań lepkosprężystych. Celem badań numerycznych było określenie wpływu opóźnionych efektów lepkosprężystych na przebieg procesu walcowania blach na zimno. W pracy określono wartości odkształceń walcowanej blachy w kotlinie walcowniczej oraz w strefie opóźnionych efektów lepkosprężystych metodą zatrzymanego obrazu.

In the work was presented and discussed the problem of rolling plate using solutions for viscoelastic bodies. The aim of the numerical researches was the determination of the phenomena of delayed viscoelastic effects influence at the cold rolling plate. The values of deformations of rolled metal were defined with use digital analysis of freezing picture method in frames of work plates and were qualified in rolling gap and the zone of delayed viscoelastic.

Dynamic contact problems with velocity conditions

75%

Chau O. , Motreanu V. V.

International Journal of Applied Mathematics and Computer Science

2002

tom 12

nr 1

17-26

We consider dynamic problems which describe frictional contact between a body and a foundation. The constitutive law is viscoelastic or elastic and the frictional contact is modelled by a general subdifferential condition on the velocity, including the normal damped responses. We derive weak formulations for the models and prove existence and uniqueness results. The proofs are based on the theory of second-order evolution variational inequalities. We show that the solutions of the viscoelastic problems converge to the solution of the corresponding elastic problem as the viscosity tensor tends to zero and when the frictional potential function converges to the corresponding function in the elastic problem.

Flow properties of high internal phase ratio oil-in-water emulsions

75%

Pal R.

1999

tom Vol. 4, no spec.

363-368

The rheological properties (yield stress, storage modulus) of a series of high internal phase ratio oil-in-water emulsions were investigated using a controlled-stress rheometer. The volume fraction of the dispersed phase ranged from 0.7124 to 0.8961. The yield stress for any given emulsion was determined from three different experiments: steady shear, oscillatory shear, and creep/recovery experiments. The yield stress values obtained from different experiments show good agreement with each other. Both yield stress and storage modulus of the emulsions increase with the increase in the dispersed phase concentration. The Princen and Kiss equations are used to interpret the yield stress and storage modulus data of this study.

Effects of couple stresses on a pulsatile magnetohydrodynamic viscoelastic flow through a channel bounded by two permeable parallel plates

63%

Eldabe N. T. M. , Hassan A. A. , Mohamed M. A. A.

2004

tom Vol. 7, nr 1

5-14

This paper is an analysis of an incompressible unsteady pulsatile laminar flow of electrically conducting non-Newtonian fluid through a channel bounded by two permeable plates taking into account the induced magnetic field and the effect of couple stresses on the flow. Solutions of the equations of motion are obtained by using Mathematica program and the effects of the various parameters entering the problem are discussed with the help of graphs. The main results show that the effect of couple stresses is to decrease the flow velocity and it is to increase (or decrease) the induced magnetic field near one of the boundaries and decrease (or increase) it near the other according to the time variation.