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Stabilized finite element method for viscoplastic flow: formulation and a simple progressive solution strategy

✍ Scribed by Antoinette M. Maniatty; Yong Liu; Ottmar Klaas; Mark S. Shephard


Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
694 KB
Volume
190
Category
Article
ISSN
0045-7825

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✦ Synopsis


This paper presents a stabilized ®nite element formulation for steady-state viscoplastic ¯ow and a simple strategy for solving the resulting non-linear equations with a Newton±Raphson algorithm. An Eulerian stabilized ®nite element formulation is presented, where mesh dependent terms are added element-wise to enhance the stability of the mixed ®nite element formulation. A local reconstruction method is used for computing derivatives of the stress ®eld needed when higher order elements are used. Linearization of the weak form is derived to enable a Newton±Raphson solution procedure of the resulting non-linear equations. In order to get convergence in the Newton±Raphson algorithm, a trial solution is needed which is within the radius of convergence. An eective strategy for progressively moving inside the radius of convergence for highly non-linear viscoplastic constitutive equations, typical of metals, is presented. Numerical experiments using the stabilization method with both linear and quadratic shape functions for the velocity and pressure ®elds in viscoplastic ¯ow problems show that the stabilized method and the progressive convergence strategy are eective in non-linear steady forming problems. Finally, conclusions are inferred and extensions of this work are discussed.


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✍ Eugenio Oñate 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 182 KB

A stabilized ®nite element formulation for incompressible viscous ¯ows is derived. The starting point are the modi®ed Navier± Stokes equations incorporating naturally the necessary stabilization terms via a ®nite increment calculus (FIC) procedure. Application of the standard ®nite element Galerkin