Finite element simulation of hot isostatic pressing of metal powders

Abouaf, M.; Chenot, Jean‐Loup; Raisson, G.; Bauduin, P

doi:10.1002/nme.1620250116

Cited by 187 publications

(133 citation statements)

References 7 publications

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“…5. Different expressions of the material functions f (φ) and c(φ) have been proposed in the past based on experimental data on metal powders (Abouaf, 1985;Abouaf and Chenot, 1988;Geindreau et al, 1999b), micromechanical modeling (cell model; Duva and Crow, 1992) or numerical simulations on simple microstructures (Sofronis and McMeeking, 1992). These functions have been identified in a restricted range of porosity (dense materials with φ < 0.4).…”

Section: Density Dependence Of the Iso-dissipation Curvesmentioning

confidence: 99%

Numerical homogenization of the viscoplastic behavior of snow based on X-ray tomography images

2017

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Abstract. While the homogenization of snow elastic properties has been widely reported in the literature, homogeneous rate-dependent behavior responsible for the densification of the snowpack has hardly ever been upscaled from snow microstructure. We therefore adapt homogenization techniques developed within the framework of elasticity to the study of snow viscoplastic behavior. Based on the definition of kinematically uniform boundary conditions, homogenization problems are applied to 3-D images obtained from X-ray tomography, and the mechanical response of snow samples is explored for several densities. We propose an original postprocessing approach in terms of viscous dissipated powers in order to formulate snow macroscopic behavior. Then, we show that Abouaf models are able to capture snow viscoplastic behavior and we formulate a homogenized constitutive equation based on a density parametrization. Eventually, we demonstrate the ability of the proposed models to account for the macroscopic mechanical response of snow for classical laboratory tests.

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Section: Density Dependence Of the Iso-dissipation Curvesmentioning

confidence: 99%

Numerical homogenization of the viscoplastic behavior of snow based on X-ray tomography images

2017

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“…One of the most widely used phenomenological models for pressureless sintering is the model developed by Olevsky. 17) Another, well known model under this category is the Abouaf model 18), 19) for hot isostatic pressing (HIP). Due to limitations on the predictive power of the phenomenological models and their dependency on rheological parameters, physical models were built by considering the effects of various physical diffusion mechanisms (grain boundary diffusion, surface diffusion, volume diffusion, plastic flow, etc.)…”

Section: )mentioning

confidence: 99%

“…Among many different models following the macroscopic approach, the densification model suggested by Abouaf 18), 19) has been frequently employed to simulate the densification process during hot isostatic pressing (HIP). The major advantage of this model is its simplicity and its ability to predict the final shape for big and complex shaped components.…”

Section: Abouaf and The Modified Abouaf Modelmentioning

confidence: 99%

A comparative study of different sintering models for Al<sub>2</sub>O<sub>3</sub>

Nguyen

Sistla

Kempen

et al. 2016

J. Ceram. Soc. Japan

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Based on various deformation mechanisms occurring during solid state sintering (pressureless and pressure assisted), a multitude of sintering models have been developed and presented in literature. As reported in literature, most of the simulation results line up well with experimental data. Unfortunately, none of them can be used arbitrarily and none of them are applicable to a generalized case. This paper focuses on a comparative study of three commonly applied models. The first model is based on a physical approach (Riedel) and the other two are phenomenologically based models (the modified SkorohodOlevsky Viscous Sintering (SOVS) model and a modified Abouaf model). The material models have been implemented through FORTRAN Subroutines used for the FE-Software ABAQUS. The simulation results demonstrate their advantages and disadvantages based on sintering simulations of an aluminum oxide based ceramic cylinder and a bilayer laminate. A guideline to select a suitable model and the adjustment of input parameters under different sintering conditions for general usage is also discussed.

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“…There are different approaches in modeling of sintering processes, ranging from continuum phenomenological models (Abouaf et al, 1988;Duva and Crow, 1992;Cocks, 1989; Sofronis and McMeeking, 1992; Ponte Castañeda, 1991) to atomistic ones (Zeng et al, 1998;Zachariah and Carrier, 1999;Zhu and Averback, 1995;Huilong and Averback, 1996;Matsubara, 1999;Kadau et al, 2002). Growing capabilities of computational techniques increased the possibilities to employ particle sintering models.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Powder Sintering Using a Discrete Element Model

Rojek¹,

Nosewicz²,

Pietrzak³

et al. 2013

Acta Mechanica Et Automatica

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This paper presents numerical simulation of powder sintering. The numerical model introduced in this work employs the discrete element method which assumes that material can be modelled by a large assembly of discrete elements (particles) of spherical shape interacting among one another. Modelling of sintering requires introduction of the cohesive interaction among particles representing interparticle sintering forces. Numerical studies of sintering have been combined with experimental studies which provided data for calibration and validation of the model. In the laboratory tests evolution of microstructure and density during sintering have been studied. Comparison of numerical and experimental results shows a good performance of the numerical model developed.

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Finite element simulation of hot isostatic pressing of metal powders

Cited by 187 publications

References 7 publications

Numerical homogenization of the viscoplastic behavior of snow based on X-ray tomography images

Numerical homogenization of the viscoplastic behavior of snow based on X-ray tomography images

A comparative study of different sintering models for Al<sub>2</sub>O<sub>3</sub>

Simulation of Powder Sintering Using a Discrete Element Model

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