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TECHNICAL PAPERS

Constitutive Modeling of Cold Compaction and Sintering of Hardmetal

[+] Author and Article Information
Lennart Mähler, Kenneth Runesson

Department of Solid Mechanics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden

J. Eng. Mater. Technol 125(2), 191-199 (Apr 04, 2003) (9 pages) doi:10.1115/1.1491576 History: Received July 30, 1999; Revised February 19, 2001; Online April 04, 2003
Copyright © 2003 by ASME
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References

Figures

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A typical shape of Φ=0 for increasing values of K (when ϱ′ and θ are fixed)
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Multiplicative decomposition of F into F̿,F̄th, and Fp
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Unit cell with a spherical pore
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Function f(ϱ) defining the dependence of ϱ′ on σs
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A typical shape of Φ=0 for increasing values of ϱ′ (when K and θ are fixed)
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A typical shape of Φ=0 for the case when θ increases from θ0 (when K and ϱ′ are fixed)
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Temperature-dependence of yield stress
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Comparison of experimental and calculated (calibrated and predicted) response at free sintering at different hold-temperatures
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Comparison of experimental and calculated (calibrated) response at sintering with a uniaxial load of 1N
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Comparison of experimental and calculated (predicted) response at sintering with a uniaxial load of 5N
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Comparison of experimental and calculated (predicted) response at sintering with a uniaxial load of 25N
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μ=0.20 and τy=40 MPa
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A schematic model of the wedge with die walls and double action punches
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Results after double action compaction: (1) deformed mesh and (2) relative density ϱ′
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Results when compaction tools are removed: (1) equivalent stress T̄e and (2) mean stress T̄m (sintering stress σs=0.55)=3.42 MPa)
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Results during sintering (after 3600 s): (1) deformed mesh and (2) relative density ϱ′
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Results during sintering (after 3600 s): (1) equivalent stress T̄e and (2) mean stress T̄m (sintering stress σs=0.56)=3.47 MPa)
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Results during sintering (after 5600 s): (1) deformed mesh and (2) relative density ϱ′
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Results during sintering (after 5600 s): (1) equivalent stress T̄e and (2) mean stress T̄m (sintering stress σs=0.67)=4.05 MPa)
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Results after sintering: (1) deformed mesh and (2) relative density ϱ′
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Results after sintering: (1) equivalent stress T̄e and (2) mean stress T̄m (sintering stress σs=0.81)=5.19 MPa).

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