Encontrados 21 documentos, a visualizar página 1 de 3
The role of poroelasticity on the biomechanics of the intervertebral disc : a f...
Castro, André; Flores, Paulo; Completo, António; Alves, J. L.The major goal for the present work is to evaluate a biomimetic Finite Element (FE) model of the Intervertebral Disc (IVD). Recent studies have emphasized the importance of an accurate biomechanical modeling of the IVD, which is a highly complex biphasic medium. A novel biphasic poroelastic model was implemented and coupled with Wilson’s model (2005) for biphasic osmotic swelling behavior. Numerical tests were ...
Numerical study on the influence of initial anisotropy on optimal blank shape
Padmanabhan, R.; Oliveira, M. C.; Baptista, A. J.; Alves, J. L.; Menezes, L. F.http://www.sciencedirect.com/science/article/B6V36-4TG8K7H-1/2/f5bb6c39fe2ad213cc96ece4a2f3a08e
Sensitivity study on some parameters in blank design
Oliveira, M. C.; Padmanabhan, R.; Baptista, A. J.; Alves, J. L.; Menezes, L. F.Sensitivity study on various numerical parameters is necessary for modeling a process. It is important to determine the influence of such parameters in order to achieve robust design. Initial blank shape is a process parameter that controls the quality of a formed part. This paper describes a blank shape optimization procedure that uses three numerical tools to determine an optimal blank shape for a formed part...
Blank design for deep drawn parts using parametric NURBS surfaces
Padmanabhan, R.; Oliveira, M. C.; Baptista, A. J.; Alves, J. L.; Menezes, L. F.Deep drawing is a forming process controlled by a number of parameters. The initial blank shape is one of the most important process parameter that has a direct impact on the quality of the finished part. This paper describes a new method to determine the optimal blank shape for a formed part using the deformation behaviour predicted by finite element simulations and salient features of NURBS surfaces. The prop...
Numerical simulation and analysis on the deep drawing of LPG bottles
Padmanabhan, R.; Oliveira, M. C.; Alves, J. L.; Menezes, L. F.Deep drawing is one of the most used sheet metal forming processes in the production of automotive components, LPG bottles and household goods, among others. The formability of a blank depends on the process parameters such as blank holder force, lubrication, punch and die radii, die-punch clearance, in addition to material properties and thickness of the sheet metal. This paper presents a numerical study made ...
Influence of process parameters on the deep drawing of stainless steel
Padmanabhan, R.; Oliveira, M. C.; Alves, J. L.; Menezes, L. F.Optimization of process parameters in sheet metal forming is an important task to reduce manufacturing cost. To determine the optimum values of the process parameters, it is essential to find their influence on the deformation behaviour of the sheet metal. The significance of three important process parameters namely, die radius, blank holder force and friction coefficient on the deep-drawing characteristics of...
Study on the influence of work-hardening modeling in springback prediction
Oliveira, M. C.; Alves, J. L.; Chaparro, B. M.; Menezes, L. F.The main goal of this study is to evaluate the influence of work-hardening modeling in springback prediction in the first phase of the Numisheet'05 "Benchmark 3": the U-shape "Channel Draw". Several work-hardening constitutive models are used in order to allow the different materials' mechanical behavior to be better described: the Swift law (a power law) or a Voce type saturation law to describe the classical ...
Calculations of the atomic and the electronic structures of 4d-transition-metal...
Paiva,R. de; Nogueira,R. A.; Alves,J. L. A.A systematic study of the zinc-blende-type 4d-transition-metal nitrides, which still need to be synthesized, is carried out by means of spin-polarized first-principles full-potential-linearized-augmented-plane- wave calculations using the local spin density approximation. In particular, lattice constants, bulk moduli, band structures and density of states are reported, and trends are discussed.
Trimming of 3D solid finite element meshes using parametric surfaces: Applicati...
Baptista, A. J.; Alves, J. L.; Rodrigues, D. M.; Menezes, L. F.In this paper we present a methodology for trimming 3D solid finite element meshes using a non-uniform rational B-spline (NURBS) surfaces representation. The algorithms applied in the identification of the spatial position of the finite element (FE) nodes and elements relative to the trimming surface are described, as well as, the explanation of the correction methods adopted to geometrically rearrange the trim...
Modelling of anisotropic work-hardening behaviour of metallic materials subject...
Bouvier, S.; Alves, J. L.; Oliveira, M. C.; Menezes, L. F.The present paper aims at reviewing some recent progress in developing advanced constitutive models which are devoted to the description of the anisotropic work-hardening behaviour under strain-path changes at large strains of metallic materials. After reviewing some microscopic and macroscopic experimental evidence, a physically-based phenomenological model using four internal state tensor variables is present...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||