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 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.
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April 2007
Technical Papers
Modeling of the Semi-Solid Material Behavior and Analysis of Micro-/Mesoscale Feature Forming
Gap-Yong Kim,
Gap-Yong Kim
Department of Mechanical Engineering,
University of Michigan
, 2350 Hayward St., Ann Arbor, MI 48109
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Muammer Koç,
Muammer Koç
NSF I/UCR Center on Precision Forming (CPF) and Department of Mechanical Engineering,
Virginia Commonwealth University
, 601 West Main St., Richmond, VA 23284
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Jun Ni
Jun Ni
Department of Mechanical Engineering,
University of Michigan
, 2350 Hayward St., Ann Arbor, MI 48109
Search for other works by this author on:
Gap-Yong Kim
Department of Mechanical Engineering,
University of Michigan
, 2350 Hayward St., Ann Arbor, MI 48109
Muammer Koç
NSF I/UCR Center on Precision Forming (CPF) and Department of Mechanical Engineering,
Virginia Commonwealth University
, 601 West Main St., Richmond, VA 23284
Rhet Mayor
Powerix, LLC
, Ann Arbor, MI
Jun Ni
Department of Mechanical Engineering,
University of Michigan
, 2350 Hayward St., Ann Arbor, MI 48109J. Manuf. Sci. Eng. Apr 2007, 129(2): 237-245 (9 pages)
Published Online: October 21, 2006
Article history
Received:
May 26, 2005
Revised:
October 21, 2006
Citation
Kim, G., Koç, M., Mayor, R., and Ni, J. (October 21, 2006). "Modeling of the Semi-Solid Material Behavior and Analysis of Micro-/Mesoscale Feature Forming." ASME. J. Manuf. Sci. Eng. April 2007; 129(2): 237–245. https://doi.org/10.1115/1.2673300
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