An Anisotropic Model for the Plastic Response of Powder Compacts

Abstract:

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In this paper we present an anisotropic compaction model based on a generic modeling framework. The model is a generalization of Hill’s anisotropic model to compressible materials and reduces to a Cam-clay type model in the isotropic limit. The model has been calibrated using experimental data for a commercial steel powder obtained from a computer controlled triaxial cell in which the yield surface was probed following loading along different paths in stress and strain space. Closed-form analytical expressions are presented for the yield surface as a function of the inelastic strain. The model has been implemented in the general purpose finite element code ABAQUS. Simulations are presented which explore the effect of a detailed structure of the constitutive law on the compaction response.

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Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

1809-1812

Citation:

W. R. Ruziwa and A. C.F. Cocks, "An Anisotropic Model for the Plastic Response of Powder Compacts", Materials Science Forum, Vols. 561-565, pp. 1809-1812, 2007

Online since:

October 2007

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$38.00

[1] A.C.F. Cocks, S.P.A. Gill, Jingzhe Pan (1999): Modeling microstructure evolution in engineering materials. Advances in Applied Mechanics, Academic Press, INC, Vol 36, pp.81-162.

DOI: https://doi.org/10.1016/s0065-2156(08)70185-6

[2] R. Hill (1950): The mathematical theory of plasticity. Oxford University Press, Oxford.

[3] L. C. R. Schneider and A. C. F. Cocks (2002): Advances in powder metallurgy and particulate materials, Princeton, NJ, MPIF.

[4] W.R. Ruziwa, L.C.R. Schneider and A.C.F. Cocks: An anisotropic model for the plastic response of ceramic powder compacts (to be published).

[5] D. Muir-Wood (1990): Soil Behaviour and Critical State Soil Mechanics. Cambridge University Press, Cambridge.

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