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TECHNICAL PAPERS

Constitutive Data for Powder Compaction Modeling

[+] Author and Article Information
I. C. Sinka, A. C. F. Cocks

Department of Engineering, University of Leicester, University Road, Leicester, LE1 7 RH, United Kingdom

J. H. Tweed

AEA Technology Plc., 552 Harwell, Didcot, OX11 0RA, United Kingdome-mail: james.tweed@aeat.co.uk

J. Eng. Mater. Technol 123(2), 176-183 (Sep 19, 2000) (8 pages) doi:10.1115/1.1339003 History: Received September 02, 1999; Revised September 19, 2000
Copyright © 2001 by ASME
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References

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Doremus,  P., Geindreau,  C., Martin,  A., Debove,  L., Lecot,  R., and Dao,  M., 1995, “High Pressure Triaxial Cell for Metal Powder,” Powder Metall., 38, No. 4, pp. 284–287.
Pavier, E., and Doremus, P., 1997, “Comparison between Constitutive Equations Modelling the Compaction of Iron Powder and Experimental Data Obtained with Triaxial Tests,” International Workshop on Modelling of Metal Powder Forming Processes, Grenoble, 21–23 July, pp. 1–8.
Pavier, E., 1998, “Characterization du Comportament d’Une Poudre de Fer pour le Procede de Compression en Matrice,” These, L’Institut National Polytechnique de Grenoble.
Trasorras, J. R. L., Parameswaran, R., and Cocks, A. C. F., 1998, “Mechanical Behavior of Metal Powders and Powder Compaction Modeling,” ASM Handbook, ASM International, Vol. 7, Powder Metal Technologies and Applications, pp. 326–342.
Cocks, A. C. F., and Sinka, I. C., 2000, “Constitutive Modelling of Powder Compaction–Theoretical Concepts,” to be submitted to Acta Mat.
Sinka, I. C., and Cocks, A. C. F., 1999, “Mechanisms of Powder Compaction,” to be submitted to Acta Mat.
Fleck,  N. A., 1995, “On the Cold Compaction of Powders,” J. Mech. Phys. Solids, 43, No. 9, pp. 1409–1431.
Akisanya,  A. R., Cocks,  A. C. F., and Fleck,  N. A., 1997, “The Yield Behavior of Metal Powders,” Int. J. Mech. Sci., 39, No. 12, pp. 1315–1324.
Sinka, I. C., and Cocks, A. C. F., 1999, “Constitutive Modelling of Powder Compaction–Evaluation of Material Data,” to be submitted to Acta Mat.
Ponter,  A. R. S., and Martin,  A. R. S., 1972, “Some Extremal Properties and Energy Theorems for Inelastic Materials and their Relationship to the Deformation Theory of Plasticity,” J. Mech. Phys. Solids, 20, pp. 281–300.
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Hill, R., 1950, The Mathematical Theory of Plasticity, Oxford University Press.
Sinka,  I. C., Cocks,  A. C. F., Morrison,  C. J., and Lightfoot,  A., 2000, “High Pressure Triaxial Facility for Powder Compaction,” Powder Metallurgy, 43, pp. 253–262.

Figures

Grahic Jump Location
Cross section of 700 MPa capacity triaxial cell illustrating powder specimen, internal load cell, and radial displacement measurement cantilever device
Grahic Jump Location
Isodensity contours in p−σe space, labels indicate absolute specimen density. Abbreviations: HC - isostatic (hydrostatic) compaction, CD - simulated closed die compaction, SR - constant stress ratio test, followed by a figure which indicates the prescribed radial to axial stress ratio.
Grahic Jump Location
Contours of constant work done in p−σe stress space. The labels to the curves indicate the work done per unit (current) volume in MJ/m3.
Grahic Jump Location
Contours of constant complementary work done in Kirchoff stress space (Jp−Jσe). The labels to the curves indicate the work done per unit (initial) volume in MJ/m3.
Grahic Jump Location
Selected contours of constant work, indicating directions of the strain increment vector (left column), and selected contours of constant complementary work, indicating directions of the total strain vector (right column), for a ceramic, a hard metal and a steel powder.

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