Die compaction of copper powder designed for material parameter identification

Bier, Wolfgang; Dariel, M.P.; Frage, N.; Hartmann, Stefan; Michailov, O.

doi:10.1016/j.ijmecsci.2006.09.026

Cited by 39 publications

(14 citation statements)

References 22 publications

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“…In PM production, powder cold compaction in the die is one of the most important steps because a high performance compact with high relative density, uniform density and stress distributions can not only simplify the subsequent processes such as sintering and finishing but also produce the part with superior quality and property and low cost. [1][2][3] Therefore, numerous studies either physically or numerically were carried out in this regard for powder cold die compaction, [3][4][5][6][7][8][9][10][11][12][13] whereas most of which were focusing on the forming of powders with relatively low initial packing density. Actually, die filling in the PM production is also a critical step; researchers have realized that high relative density and homogeneity in initial powder packing formed during die filling are of key importance for subsequent procedures.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Modeling on the Compaction of Copper Powder Under Different Conditions

Zhang²,

Zhang

et al. 2015

Metall Mater Trans A

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Single-action die compaction of copper powders with initial loose natural packing and vibrated random dense packing structures was carried out numerically by finite element method and physically for validation. Furthermore, the compaction under various cyclic loadings was modeled to identify its effects on the compact properties. The results were analyzed and compared between compacts formed at different initial packing structures and different forming conditions, which indicate that at the same pressure, single-action die compaction on the dense uniform initial packing can produce compacts with high relative density, uniform density and stress distributions, which implies the necessity to improve initial packing density and uniformity in forming high performance compacts. Meanwhile, by using cyclic loading on such dense initial packing structures, compacts with higher packing density and more uniform density and stress distributions can be created. The numerical and physical results are comparable and in good agreement with the proposed double logarithmic equation.

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Section: Introductionmentioning

confidence: 99%

Finite Element Modeling on the Compaction of Copper Powder Under Different Conditions

Zhang²,

Zhang

et al. 2015

Metall Mater Trans A

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“…7 both parameters -evaluated at room-temperature - are assembled from the data of the literature, see [28]. Here, we refer to the discussion in [29] as well, where constant values are assumed. We follow this assumption of constant values -however, choosing different values -since there are physical observations being more complex to be modeled, see Section 4.…”

Section: Thermo-mechanical Properties Of Copper Powdermentioning

confidence: 99%

“…These test are performed in a classical tension/compression testing machine, where strain gauges are applied on the surface of the graphite die, and reverse computations are performed using finite elements to estimate the radial stress distribution, see [29] for a similar discussion -there, radial displacements are measured instead of the circumferential strains. The tests of cold compaction are drawn on in such a manner that particular material parameters of the yield function can be determined.…”

Section: Thermo-mechanical Properties Of Copper Powdermentioning

confidence: 99%

Field assisted sintering technology. Part I: Experiments, constitutive modeling and parameter identification

et al. 2016

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Field-assisted sintering technology (FAST), also well-known under the term spark-plasma sintering (SPS), is a grown process technology to produce parts made of a powder material. The process itself has the advantage of carrying out compaction, sintering and cooling with high temperature rates in one process step. This is done using an electrical current, which heats the graphite tools and, accordingly, the powder within the die itself. The theoretical description itself is very complicated caused by the fact of having electro-thermomechanical coupling effects, large deformations, contact problems for each field, but the essential point are the amount of experiments required to determine the parameters of the model. In this article, the required experiments to obtain the electrical, thermal and mechanical properties of both materials are discussed, a constitutive model of compressible thermo-viscoplasticity for copper powder is proposed, and aspects of material parameter identification are addressed.

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“…The calibration relation can be identified experimentally from a die compaction test on an incompressible rubbery sample (Mosbah et al, 1997;Geindreau et al, 1999;Hong et al, 2008;Michrafy et al, 2009) or numerically when the circumferential strain of the hollow cylinder is known (Bier et al, 2007). In this study, we choose to carry out a calibration test with an incompressible sample.…”

Section: Calibration Test On a Rubbery Samplementioning

confidence: 99%

Characterization and modelling of a carbon ramming mix used in high-temperature industry

Brulin¹,

Rekik²,

Josserand³

et al. 2011

International Journal of Solids and Structures

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a b s t r a c tThis paper is devoted to the modelling of a specific ramming mix mainly used in the high-temperature industry due to its high-compacting behaviour. This material has the ability to absorb the deformation of parts submitted to high thermal loads. Triaxial and instrumented die compaction tests were carried out in order to identify the shear and hardening behaviours, respectively. Tests on the ramming mix were led for a temperature range between 20°C and 80°C. The temperature effect is particularly observed on the material response when it is compacted. The main features of the behaviour of the ramming mix can be represented by the theoretical framework of the Modified Cam-Clay model. A single variable allows to accurately reproduce the hardening behaviour depending on the temperature. Moreover, an extension of the model for the hardening behaviour at high pressures is proposed. A good agreement between the experimental data and numerical tests is reached with this model.

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Die compaction of copper powder designed for material parameter identification

Cited by 39 publications

References 22 publications

Finite Element Modeling on the Compaction of Copper Powder Under Different Conditions

Finite Element Modeling on the Compaction of Copper Powder Under Different Conditions

Field assisted sintering technology. Part I: Experiments, constitutive modeling and parameter identification

Characterization and modelling of a carbon ramming mix used in high-temperature industry

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