The viscoplastic compaction of composite powders

Storåkers, Bertil; Fleck, N.A.; McMeeking, Robert M.

doi:10.1016/s0022-5096(98)00076-3

Cited by 146 publications

(107 citation statements)

References 37 publications

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“…Storakers et al [15] show that the simpli®cation (3) is in close agreement with (2) for the initial stages of densi®cation D À D 0 < 0.15. For the case of powder composites, the SFM theory assumes a bimodal distribution of spheres; one population is of radius R 1 and of strength s 1 , whereas the other population is of radius R 2 and of strength s 2 (but with the same strain-hardening exponent M ).…”

Section: Pertinent Results Of the Powder Compaction Model By Storakersupporting

confidence: 53%

“…Storakers, Fleck and McMeeking (SFM) [15] consider the viscoplastic densi®cation of a composite powder aggregate. Here, we specialise their results to the rate independent case, for equi-sized spherical powder of particle radius R 1 .…”

Section: Pertinent Results Of the Powder Compaction Model By Storakermentioning

confidence: 99%

“…The SFM model assumes a kinematically admissible ®eld, based on the a ne motion of particle centres without rotation; thus, the e ects of particle rearrangement in the initial stages of compaction are neglected, and the model is an upper bound to the true response. Further, recent calculations by Mesarovic and Fleck [20] reveal that the local indentation response between particles (both soft±soft and soft±hard contacts) is less sti than the contact laws assumed by Storakers et al [15] by 30±40%. Thus the predicted macroscopic stresses for compaction are expected to be at least 30±40% less than that given by the original SFM model.…”

Section: Isostatic Compaction Of Al and Al±40%sic Compositementioning

confidence: 86%

“…The densi®cation response of Al±40%SiC has also been compared with the composite powder compaction theory of Storakers et al [15] in Fig. 4(c).…”

Section: Isostatic Compaction Of Al and Al±40%sic Compositementioning

confidence: 99%

“…Recently, Storakers et al [15] have developed a Stage I model to predict the macroscopic compaction response of a powder composite. We begin by summarising the relevant results of their theory.…”

Section: Introductionmentioning

confidence: 99%

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Yield behaviour of cold compacted composite powders

Idapalapati

Fleck

2000

Acta Materialia

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AbstractÐA triaxial test rig is used to study the axisymmetric cold compaction behaviour of powder composites comprising aluminium with silicon carbide reinforcement, and lead shot with steel reinforcement. Under hydrostatic loading the pressure±density response shows an increase in strength with increasing volume fraction of reinforcement. For a given volume fraction of inclusions, the compaction pressure to achieve a given relative density increases with diminishing size of reinforcement. The yield surfaces are measured after isostatic and closed-die compaction; it is found that the shape depends upon the deformation path, with greatest hardening along the loading direction. The e ect of reinforcement on the overall shape of the yield surface is found to be minor. 7

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Section: Pertinent Results Of the Powder Compaction Model By Storakersupporting

confidence: 53%

Section: Pertinent Results Of the Powder Compaction Model By Storakermentioning

confidence: 99%

Section: Isostatic Compaction Of Al and Al±40%sic Compositementioning

confidence: 86%

“…The densi®cation response of Al±40%SiC has also been compared with the composite powder compaction theory of Storakers et al [15] in Fig. 4(c).…”

Section: Isostatic Compaction Of Al and Al±40%sic Compositementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Yield behaviour of cold compacted composite powders

Idapalapati

Fleck

2000

Acta Materialia

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(De)compaction of porous viscoelastoplastic media: Model formulation

2015

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A nonlinear viscoelastoplastic theory is developed for porous rate-dependent materials filled with a fluid in the presence of gravity. The theory is based on a rigorous thermodynamic formalism suitable for path-dependent and irreversible processes. Incremental evolution equations for porosity, Darcy's flux, and volumetric deformation of the matrix represent the simplest generalization of Biot's equations. Expressions for pore compressibility and effective bulk viscosity are given for idealized cylindrical and spherical pore geometries in an elastic-viscoplastic material with low pore concentration. We show that plastic yielding around pores leads to decompaction weakening and an exponential creep law. Viscous and plastic end-members of our model are consistent with experimentally verified models. In the poroelastic limit, our constitutive equations reproduce the exact Gassmann's relations, Biot's theory, and Terzaghi's effective stress law. The nature of the discrepancy between Biot's model and the True Porous Media theory is clarified. Our model provides a unified and consistent formulation for the elastic, viscous, and plastic cases that have previously been described by separate "end-member" models.

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Simulation in Powder Technology

Riedel

Kraft

2004

Continuum Scale Simulation of Engineering Materials

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The viscoplastic compaction of composite powders

Cited by 146 publications

References 37 publications

Yield behaviour of cold compacted composite powders

Yield behaviour of cold compacted composite powders

(De)compaction of porous viscoelastoplastic media: Model formulation

Simulation in Powder Technology

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