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A hypoelasto-plastic finite strain simulation of powder compaction processes with density-dependent endochronic model

Khoei, A. R ; Sharif University of Technology | 2004

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijsolstr.2004.05.013
  3. Publisher: 2004
  4. Abstract:
  5. In this paper, a new approach is developed based on an endochronic density-dependent plasticity model for describing the isothermal deformation behavior of metal powder at low homologous temperature. As large deformations are observed in powder compaction processes, the endochronic constitutive model is presented based on large strain plasticity and an integration scheme is established for the rate constitutive equations. Endochronic constitutive equations are established based on coupling between deviatoric and hydrostatic behavior. The elastic response is stated in term of hypoelastic model and endochronic constitutive equations are stated in unrotated frame of reference. Finally, the algorithmic modulus consistent with numerical integration algorithm of constitutive equations is extracted. Although the concept of yield surface has not been explicitly assumed in endochronic theory, it is demonstrated that the cone-cap yield surface can be derived as a special case of the proposed endochronic model. The material parameters in endochronic model are calibrated for two samples of metal powder by fitting the model to reproduce data from true-triaxial compression experiments. The numerical schemes are examined for efficiency and accuracy in the modeling of three powder compaction components. © 2004 Elsevier Ltd. All rights reserved
  6. Keywords:
  7. Endochronic plasticity ; Hypoelastic model ; Large strain ; Plastic deformation ; Powder forming
  8. Source: International Journal of Solids and Structures ; Volume 41, Issue 22-23 , 2004 , Pages 6081-6110 ; 00207683 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0020768304002409