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H-adaptive finite element analysis for localization phenomena with reference to metal powder forming

Khoei, A. R ; Sharif University of Technology | 2002

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  1. Type of Document: Article
  2. DOI: 10.1016/S0168-874X(01)00082-8
  3. Publisher: 2002
  4. Abstract:
  5. Standard finite element models, i.e. finite element methods that use standard constitutive models, suffer from excessive mesh dependence when strain-softening models are used in numerical analyses and cannot reproduce the size effect commonly observed in quasi-brittle failure. In this paper, an h-adaptive analysis for the mixed finite element solution of solid mechanics problems is presented with special reference to metal powder forming involving localization due to material instability. A remeshing strategy is employed to compute the distribution of required element size using the estimated error distribution. The numerical results are obtained for a Von-Mises yield criterion applied to a multi-level component, at the final stage of compaction. It shows how adaptive remeshing techniques can be applied to improve the definition of the shear band, using a non-local constitutive model to avoid loss of mesh objectivity. © 2002 Elsevier Science B.V. All rights reserved
  6. Keywords:
  7. Adaptive remeshing ; Displacement discontinuity ; Element elongation ; Incompressibility ; Strain softening
  8. Source: Finite Elements in Analysis and Design ; Volume 38, Issue 6 , 2002 , Pages 503-519 ; 0168874X (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0168874X01000828