Comparison of various plasticity models for metal powder compaction processes

Biswas, Karabi

doi:10.1016/j.jmatprotec.2004.08.006

Cited by 32 publications

(16 citation statements)

References 19 publications

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“…Correction factors for modeling the compaction of one powder are not necessarily applicable to another one, which decreases the effectiveness of modeling [7]. In addition, even one-parameter rheological relations derived by different authors have substantial distinctions [8]. The reasons are obvious: the plastic properties of a powder body being pressed depend not only on porosity, but also on other internal structural parameters disregarded in the simplest models [9].…”

Section: Direct Multiscale Modeling Approachmentioning

confidence: 99%

Direct multiscale modeling of cold pressing of metal powders

Maksimenko

2009

Powder Metall Met Ceram

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A new numerical approach is proposed to model powder pressing. It is called direct multiscale modeling. In direct multiscale modeling, each macroscopic finite element has a corresponding microstructure regarded as a powder representative cell. On the assumption that the strain rate of the macroscopic finite element and average strain rates of the representative cells are equal, the kinetics of macroscopic deformation and microscopic distortions of the representative cells is determined at every instant. The problem dealing with the effect of the initial spheroidization of intraagglomerate pores on the compaction of agglomerated powders is considered as an example. The new approach permits assessing the effect of the initial intraagglomerate pore shape on the closure kinetics of interagglomerate pores in pressing.

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Section: Direct Multiscale Modeling Approachmentioning

confidence: 99%

Direct multiscale modeling of cold pressing of metal powders

Maksimenko

2009

Powder Metall Met Ceram

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“…Moreover, the microscopic dynamic characteristics of particles cannot be studied during physical experiments, which hinder the detailed investigation of translation, rotation, interaction force, and deformation behavior of particles. Moreover, geometric nonlinearity, material nonlinearity, and contact nonlinearity of the forming process raise difficulties in the physical experiments [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Particulate Scale Multiparticle Finite Element Method Modeling on the 2D Compaction and Release of Copper Powder

Li-wen

Han

Liu

et al. 2019

Mathematical Problems in Engineering

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Herein, two-dimensional (2D) single-action die compaction process of copper (Cu) powder was simulated by the multiparticle finite element method (MPFEM) at particulate scale. The initial packing structure, generated by the discrete element method (DEM), was used as an input for the FEM model, where the mesh division of each particle was discretized. The evolution of macro- and microscopic properties, such as relative density, stress distribution, particle deformation, void filling behavior, and force transmission, during compaction and pressure release processes have been systematically studied. The results revealed that the force is mainly concentrated on largely deformed regions of the particles during compaction and formed a contact force network, which hindered the densification process. In the compact, the shorter side of the large void edges rendered higher stress than the longer side. On the other hand, the stress distribution of small void edges remained uniform. After pressure release, large residual stress was observed at the contact area of the adjacent particles and the maximum stress was observed at the particles’ edges. Moreover, the residual stress did not proceed to the interior of the particles. Meanwhile, the stress of large void edges has been completely released but exhibited a nonuniform distribution. The smaller fraction of void filling resulted in a larger reduction of the released stress after pressure removal. Also, the particles closer to the upper die exhibited higher average equivalent von Mises stress inside the particles during compaction and pressure release processes.

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“…Therefore, the researches on the compaction of Al/SiC composite powders when subjected to external energy have increasingly attracted the materials scientists and engineers' interests in the past few years. Nevertheless, even though physical experiments can reproduce the relationship between relative density and compaction pressure and/or temperature, they are unable to quantitatively characterize the local density distribution, stress distribution, and particle motion behavior for pore (or void) filling in situ, especially the nonlinearity features in geometry, materials, and contact during compaction all increase the difficulties of physical experiments [18][19][20][21][22]. Most importantly, it's really hard for researchers to accurately control the uniform distribution (ordered or disordered) of reinforcement (SiC) in the metal (Al) matrix, these disadvantages in physical experiments can be conquered by the so called numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

MPFEM Modeling on the Compaction of Al/SiC Composite Powders with Core/Shell Structure

An¹,

Liu²,

Huang³

et al. 2018

Powder Technology

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Uniaxial die compaction of two-dimensional (2D) Al/SiC core/shell (core: SiC; shell: Al) composite powders with different initial packing structures was numerically reproduced using DEM-FEM coupled MPFEM modeling from particulate scale. The effects of external pressure, initial packing structure, and SiC content on the packing densification were systematically presented. Various macro and micro properties such as relative density and distribution, stress and distribution, particle rearrangement (e.g. sliding and rolling), deformation and mass transfer, and interfacial behavior within composite particles were characterized and analyzed. The results show that by properly controlling the initial packing structure, pressure, and SiC content, various anisotropic and isotropic Al/ SiC particulate composites with high relative densities and uniform density/stress distributions can be obtained. At early stage of the compaction, the densification mechanism mainly lies in the particle rearrangement driven by the low interparticle forces. In addition to sliding, accompanied particle rolling also plays an important role. With the increase of the compaction pressure, the force network based on SiC cores leads to extrusion on Al shells between two cores, contributing to mass transfer and pore filling. During compaction, the debonding between the core and shell of each composite particle appears and then disappears gradually in the final compact.

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Comparison of various plasticity models for metal powder compaction processes

Cited by 32 publications

References 19 publications

Direct multiscale modeling of cold pressing of metal powders

Direct multiscale modeling of cold pressing of metal powders

Particulate Scale Multiparticle Finite Element Method Modeling on the 2D Compaction and Release of Copper Powder

MPFEM Modeling on the Compaction of Al/SiC Composite Powders with Core/Shell Structure

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