Modelling of solid-phase sintering of hardmetal using a mesomechanics approach

Mähler, Lennart; Runesson, Kenneth

doi:10.1002/1099-1484(200011)5:8<653::aid-cfm111>3.0.co;2-a

Cited by 10 publications

(4 citation statements)

References 19 publications

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“…Further, we define the so-called effective Kirchhoff stress tensor (cf. Mähler and Runesson [15])τ = τ − τ s I (18) with the sintering stress τ s and the drag stress R work-conjugate to the accumulated plastic strain:…”

Section: Thermodynamically Consistent Materials Modelmentioning

confidence: 99%

“…Generally, the free surface energy due to porosity depends on the surface area of the pores and thereby on the relative density and on the pore shape. In order to formulate an expression for ψ p , we adopt the ideas of Mähler and Runesson [15]. They assume the pore to be of spherical shape and to remain spherical throughout the compaction.…”

Section: Thermodynamically Consistent Materials Modelmentioning

confidence: 99%

“…The pressure sensitivity of the yield surface is restricted to positive values for the pressure p = −trτ /3 by using the McCauley brackets in (27). Considering (15) in connection with (26.1) and (28), it can be seen that a decrease of the relative density can be avoided in this way.…”

Section: Thermodynamically Consistent Materials Modelmentioning

confidence: 99%

“…McMeeking and Kuhn [18]). In this regard, the definition of a rational thermodynamic force, the so-called sintering stress, that is responsible for a densification even in the absence of an external load has been proposed, e.g., by Mähler and Runesson [15].…”

Section: Introductionmentioning

confidence: 99%

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Modelling and simulation of process-integrated powder coating by radial axial rolling of rings

Frischkorn

Reese

2011

Arch Appl Mech

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In this paper, we present finite element (FE) process simulations of a new production method used to coat ring-shaped work pieces with functional layers. Similarly to the conventionally applied hot isostatic pressing (HIP), this new coating method is based on powder metallurgy. It is expected to overcome some important drawbacks by integrating the consolidation of the powdery layer material into the hot rolling of the substrate ring. This makes HIP dispensable. Nevertheless several difficulties arise through the process integration. E.g., the presence of the compactable layer requires a different handling of the rolling stage compared with classical ring rolling. FE simulations shall support the design of this new process in order to investigate critical process parameters. For this purpose, new finite element modules have to be developed. A crucial point is the adequate modelling of the layer material. In this regard, we present a rate-dependent finite strain material model that describes the consolidation of the layer material in a thermodynamically consistent way. Moreover, FE process simulations of the new production method are presented and compared with experimental results.

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Section: Thermodynamically Consistent Materials Modelmentioning

confidence: 99%

Section: Thermodynamically Consistent Materials Modelmentioning

confidence: 99%

Section: Thermodynamically Consistent Materials Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modelling and simulation of process-integrated powder coating by radial axial rolling of rings

Frischkorn

Reese

2011

Arch Appl Mech

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A Mesoscale Description of Microstructural Evolution for Slip Cast Alumina Sintered at 1350°C

McAfee

Nettleship

2006

Ceramic Transactions Series

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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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Modelling of solid-phase sintering of hardmetal using a mesomechanics approach

Cited by 10 publications

References 19 publications

Modelling and simulation of process-integrated powder coating by radial axial rolling of rings

Modelling and simulation of process-integrated powder coating by radial axial rolling of rings

A Mesoscale Description of Microstructural Evolution for Slip Cast Alumina Sintered at 1350°C

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

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