Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
APPROXIMATIONS OF ELASTO-VISCOPLASTIC MATERIALS
Submission Author:
Giovanni Furtado , RS
Co-Authors:
Giovanni Furtado, Márleson Ferreira, Sergio Frey, Monica Naccache, Paulo Roberto de Souza Mendes
Presenter: Giovanni Furtado
doi://10.26678/ABCM.COBEM2019.COB2019-0659
Abstract
Viscoplastic fluids are materials of great interest both in industry and in our daily lives. These applications range from food and cosmetics products to industrial applications such as plastics in the industry of polymers and drilling muds the oil industry. This class of material is characterized by having a yield stress that must be exceeded to the material starts to flow. These fluids are classically predicted by purely viscous models with yield stress. In the last decade, however, there some experimental visualizations has reported that the unyielded regions exhibit elasticity inside. This work is an attempt to investigate the effect of elasticity and inertia in those materials. We will studied, therefore, inertia flow of elastic-viscoplastic materials with no thixotropic behavior, according to the material equation introduced in de Souza Mendes (2011). The mechanical model is approximated by a stabilized finite element method in terms of extra stress, pressure and velocity. Due to its fine convergence feature, the method allows the use of equal-order finite elements and generates stable solutions in high advective-dominated flows. In this study is considered the geometry of a biquadratic cavity, in which the top wall moves to the right at constant velocity. In all computations is used biquadratic Lagrangian (Q1) elements. Results focuses in determining the influence of elasticity and inertia on the position and shape of unyielded. These results proved to be physically meaningful, indicating a strong interlace between elasticity and inertia on determining of the topology of yield surfaces.
Keywords
elastic-viscoplastic materials, finite element, biquadratic cavity, elasticity and inertia
