Modeling of conventional hot compaction and Spark Plasma Sintering based on modified micromechanical models of porous materials

Wolff, Cyprien; Mercier, Sébastien; Couque, H.; Molinari, A.

doi:10.1016/j.mechmat.2011.12.002

Cited by 49 publications

(34 citation statements)

References 47 publications

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“…However, recent efforts have been done to implement specific constitutive sintering laws in FEM codes. [44,52,57,[260][261][262][263] As an example, FEM calculations are shown in Figure 5 for electrically insulating (Si 3 N 4 ) and conductive (TiN) materials. The simulations are based on a FlexPDE transient model with coupled balance equations for thermal and electrical energy transport.…”

Section: Finite Element Modelingmentioning

confidence: 99%

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

et al. 2014

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Field-assisted sintering technology/Spark plasma sintering is a low voltage, direct current (DC) pulsed current activated, pressure-assisted sintering, and synthesis technique, which has been widely applied for materials processing in the recent years. After a description of its working principles and historical background, mechanical, thermal, electrical effects in FAST/SPS are presented along with the role of atmosphere. A selection of successful materials development including refractory materials, nanocrystalline functional ceramics, graded, and non-equilibrium materials is then discussed. Finally, technological aspects (advanced tool concepts, temperature measurement, finite element simulations) are covered.

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Section: Finite Element Modelingmentioning

confidence: 99%

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

et al. 2014

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“…However, in the FAST-machine the powder material undergoes large plastic deformation. Recently [7][8][9] dealt with the densification process. In [7] an additive decomposition of the strain-rate tensor is used for the constitutive model into an elastic, viscoplastic and a thermal part.…”

Section: Wwwgamm-mitteilungenorgmentioning

confidence: 99%

“…It is emphasized that the temperature in the axial direction is not symmetric due to the motion of the upper punches. An electro-thermomechanical simulation with Abaqus is performed in [9]. In this work a micro-mechanical thermo-viscoplastic model with a decomposition of the strain-rate tensor into an elastic, thermal and viscoplastic parts is developed.…”

Section: Wwwgamm-mitteilungenorgmentioning

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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“…However, in the FAST-machine the powder material undergoes large plastic deformation. Recently [33][34][35] dealt with the densification process. In [33] an additive decomposition of the strain-rate tensor is used for the constitutive model into an elastic, viscoplastic and a thermal part.…”

Section: Introductionmentioning

confidence: 99%

“…It is emphasized that the temperature in the axial direction is not symmetric due to the motion of the upper punches. An electro-thermo-mechanical simulation with Abaqus is performed in [35]. In this work a micro-mechanical thermo-viscoplastic model with a decomposition of the strain-rate tensor into an elastic, thermal and viscoplastic parts is developed.…”

Section: Introductionmentioning

confidence: 99%

Field Assisted Sintering Technology, Part II: Simulation

Rothe

Hartmann

2017

GAMM-Mitteilungen

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Field-assisted sintering technology (FAST) implies a multifield problem between electrical, thermal and mechanical fields. Based on a constitutive model proposed in [1], the numerical treatment of the three-field problem in a monolithic finite element framework is discussed. Apart from algorithmic considerations, numerical simulations are performed treating the complex contact problem, large deformations and the multifield issues themselves. This is combined with a PID-controller, which is required when the temperature process is given at specific positions in the graphite tool system and the electrical current is uncertain. The numerical simulations are validated by real experiments.

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Modeling of conventional hot compaction and Spark Plasma Sintering based on modified micromechanical models of porous materials

Cited by 49 publications

References 47 publications

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

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

Field Assisted Sintering Technology, Part II: Simulation

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