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A new computational algorithm for 3D contact modeling of large plastic deformation in powder forming processes

Khoei, A. R ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.commatsci.2009.02.026
  3. Publisher: 2009
  4. Abstract:
  5. In this paper, the three-dimensional large deformation frictional contact of powder forming process is modeled using a simple computational algorithm based on the augmented-Lagrange approach. The technique is applied by imposing the contact constraints and modifying the contact properties of frictional slip through the node-to-surface (NTS) contact algorithm. The Coulomb friction law is employed to simulate the friction between the rigid punch and the work-piece by the use of penalty and augmented-Lagrange approaches. It is shown that the augmented-Lagrange technique significantly improves imposing of the constraints on contact surfaces. The nonlinear contact friction algorithm is employed together with a double-surface cap plasticity model for highly nonlinear behavior of powder within the framework of large FE deformation in order to predict the non-uniform relative density and stress distributions during the large deformation of powder die-pressing. Finally, the numerical schemes are examined for accuracy and efficiency in modeling of a set of powder components. © 2009 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Augmented-Lagrange approach ; Cap plasticity ; Contact friction ; Large deformation ; Node-to-surface algorithm ; Compaction ; Computation theory ; Deformation ; Friction ; Lagrange multipliers ; Laws and legislation ; MOSFET devices ; Plasticity ; Powders ; Stress concentration ; Three dimensional ; Tribology ; Three dimensional computer graphics
  8. Source: Computational Materials Science ; Volume 46, Issue 1 , 2009 , Pages 203-220 ; 09270256 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0927025609000846