Modeling of the semi-solid material behavior and analysis of micro-/mesoscale feature forming

Gap Yong Kim, Muammer Koç, Rhet Mayor, Jun Ni

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

One of the major challenges in simulation of semi-solid forming is characterizing the complex behavior of a material that consists of both solid and liquid phases. In this study, a material model for an A356 alloy in a semi-solid state has been developed for high solid fractions (>0.6) and implemented into a finite element simulation tool to investigate the micro-/mesoscale feature formation during the forming process. Compared to previous stress models, which are limited to expressing the stress dependency on only the strain rate and the temperature (or the solid fraction), the proposed stress model adds the capability of describing the semi-solid material behavior in terms of strain and structural evolution. The proposed stress model was able to explain the strain-softening behavior of the semi-solid material. Furthermore, a simulation model that includes the yield function, the flow rule, and the stress model has been developed and utilized to investigate the effects of various process parameters, including analysis type (isothermal vs nonisothermal), punch velocity, initial solid fraction, and workpiece shape ("flat" versus "tall") on the micro-/mesofeature formation process.

Original languageEnglish
Pages (from-to)237-245
Number of pages9
JournalJournal of Manufacturing Science and Engineering, Transactions of the ASME
Volume129
Issue number2
DOIs
Publication statusPublished - 1 Apr 2007
Externally publishedYes

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Keywords

  • A356
  • Material modeling
  • Micro/meso-scale forming
  • Semisolid forming

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering

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