Constitutive modeling and related numerical issues in conjunction with the macroscopic analysis and simulation of cold compaction and subsequent solid phase sintering of hard-metal are discussed. A key ingredient is the concept of sintering stress, which is derived as a thermodynamically consistent dissipative stress, based on a simplified microstructural arrangement with spherical pores. In order to account for the temperature effect on the rate-dependent response during the sintering phase, the concept of viscoplastic admissibility is employed as part of the model framework. A generic class of pressure-sensitive models is considered, and the particular model chosen for calibration is based on quasistatic and dynamic yield surfaces that are elliptic in the meridian planes of the stress space. Implicit integration is used for the pertinent evolution equations. The paper is concluded by a numerical investigation of the compaction and sintering of a specimen, whereby the model is calibrated using experimental data from free and uniaxially loaded sintering experiments (within a joint research project).
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April 2003
Technical Papers
Constitutive Modeling of Cold Compaction and Sintering of Hardmetal
Lennart Ma¨hler,
Lennart Ma¨hler
Department of Solid Mechanics, Chalmers University of Technology, SE-412 96 Go¨teborg, Sweden
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Kenneth Runesson
Kenneth Runesson
Department of Solid Mechanics, Chalmers University of Technology, SE-412 96 Go¨teborg, Sweden
Search for other works by this author on:
Lennart Ma¨hler
Department of Solid Mechanics, Chalmers University of Technology, SE-412 96 Go¨teborg, Sweden
Kenneth Runesson
Department of Solid Mechanics, Chalmers University of Technology, SE-412 96 Go¨teborg, Sweden
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division July 30, 1999; revised manuscript received February 19, 2001. Associate Editor: H. ZBIB.
J. Eng. Mater. Technol. Apr 2003, 125(2): 191-199 (9 pages)
Published Online: April 4, 2003
Article history
Received:
July 30, 1999
Revised:
February 19, 2001
Online:
April 4, 2003
Citation
Ma¨hler , L., and Runesson, K. (April 4, 2003). "Constitutive Modeling of Cold Compaction and Sintering of Hardmetal ." ASME. J. Eng. Mater. Technol. April 2003; 125(2): 191–199. https://doi.org/10.1115/1.1491576
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