3D computational modeling of powder compaction processes using a three-invariant hardening cap plasticity model

Azami, A.R.; Khoei, A.R.

doi:10.1016/j.finel.2006.01.011

Cited by 17 publications

(13 citation statements)

References 23 publications

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“…24 and 25, the evolution of normal stress σ y contours and the predicted relative density distributions are shown at different bottom punch movements for both Lagrangian and ALE analysis. These results can be compared with those obtained by Azami and Khoei [52] using a Lagrangian FE modeling. The applicability of the cap plasticity model in the formwork of ALE approach to handle the complete compaction simulation of powder is clearly evident in this figure.…”

Section: An Automotive Componentmentioning

confidence: 86%

“…These experiments were carried out by Khoei and Azami [48] to present the performance of their plasticity model with isotropic hardening behavior, and then applied into the finite element code by Azami and Khoei [52] to demonstrate the simulation of powder forming processes. Both isostatic and triaxial tests are driven to determine and calibrate the parameters of the model.…”

Section: Model Parameters For Iron Powdermentioning

confidence: 99%

“…22a. A Lagrangian finite element modeling was carried out for this component by Azami and Khoei [52]. Also, the measured density distribution was obtained for this example by Shen et al [54].…”

Section: An Automotive Componentmentioning

confidence: 99%

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Arbitrary Lagrangian–Eulerian method in plasticity of pressure-sensitive material: application to powder forming processes

et al. 2008

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In this paper, an application of Arbitrary Lagrangian-Eulerian (ALE) method is presented in plasticity behavior of pressure-sensitive material, with special reference to large deformation analysis of powder compaction process. In ALE technique, the reference configuration is used for describing the motion, instead of material configuration in Lagrangian, and spatial configuration in Eulerian formulation. The convective term is used to reflect the relative motion between the mesh and the material. Each time-step is divided into the Lagrangian phase and Eulerian phase. The convection term is neglected in the material phase, which is identical to a time-step in a standard Lagrangian analysis. The stresses and plastic internal variables are converted to account the relative mesh-material motion in the convection phase. The ALE formulation is then performed within the framework of a three-invariant cap plasticity model in order to predict the non-uniform density distribution during the large deformation of powder die pressing. The plasticity model is based on a hardening rule with the isotropic and kinematic material functions. The constitutive elasto-plastic matrix and its components are derived by using the definition of yield surface, material functions and non-linear elastic behavior, as function of hardening parameters. Finally, the numerical examples are performed to illustrate the applicability of the computational algorithm in modeling of powder forming process and the results are compared with those obtained from Lagrangian simulation in order to demonstrate the accuracy of proposed model.

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Section: An Automotive Componentmentioning

confidence: 86%

Section: Model Parameters For Iron Powdermentioning

confidence: 99%

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Arbitrary Lagrangian–Eulerian method in plasticity of pressure-sensitive material: application to powder forming processes

et al. 2008

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“…Green compacts are made typically at ambient temperature through following stages ( Fig. 1): 1) Rearrangement of the particles by filling large pores accompanied with the increase in number of contacts (coordination number); 2) packing of particles resulting in decrease in porosity with the formation of localized agglomeration of particles, namely secondary and higher order particle structures; 3) increase in the contact area between particles accompanying elastic deformation of particles; and 4) contact enlargement through plastic deformation of particles (Azami and Khoei, 2006;Bortzmeyer, 1992;Castellanos et al, 2005;Cunningham et al, 2004;Fayed and Otten, 1984;German, 2014;.…”

Section: Compaction As a Powder Processing Operationmentioning

confidence: 99%

Critical Review on Engineering Mechanical Quality of Green Compacts using Powder Properties

Pandeya²,

Karamchandani

et al. 2018

KONA

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For processes involving particulate materials, mechanical properties of green compacts are of great interest when they are final or intermediate products. Optimal quality of green compacts is achieved usually with empirical approaches, i.e., unexpected issues in processes or products' quality are usually mitigated by time and resource consuming trial-and-error methods. Issues of the powder compaction are commonly observed when there are problems in feed materials or operational conditions even without any substantial change in a formula. Such divergent behavior of particulate materials is especially problematic for product developments and reliable operations. It has been widely accepted hypothesis that properties of particles are determinants of mechanical behavior of powder during compaction and the quality of resulting compacts. With recent developments in nanotechnology, characterization and engineering of individual particles at a microscopic or sub-microscopic scale are now feasible. Leveraging recent technological advancements, there has been a good progress in regard to quantitative understanding of mechanical relationships between properties of particles, particle system and final product. This review highlights the recent developments and gaps in engineering mechanical quality of powder compacts in conjunction with the characterization of particle systems and compaction at multiple scales.

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“…can be found in the literature (Homand & Shao 2000, Azami & Khoei 2006, Wu et al 2005. However, many of these models are limited to the short-term response.…”

Section: Introductionmentioning

confidence: 99%

An elastoplastic and viscoplastic model for porous geomaterials

Souley¹,

Lafrance²,

Auvray³

et al. 2016

Rock Mechanics and Rock Engineering: From the Past to the Future

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Chalk rocks have been used for centuries as strong building materials and for the production of lime. The shallow underground room-and-pillar quarries where chalk rocks were extracted are now abandoned and are enduring the effects of time and weathering which increases their risk of collapse. A large campaign of laboratory tests under different Relative Humidity values (from 90 to 98%) was undertaken to describe the short and long term behavior of two chalks. These laboratory tests clearly show an elastoplastic behavior with strain-hardening/softening, a relative humidity-dependent strength, a pore collapse and matrix densification even if the stress level is much higher than that prevailing in situ as well as a time-dependent shear and volumetric strains. A multi-mechanism (tensile, shear, pore collapse/compaction, creep) model of the mechanical behavior for highly porous geomaterials is proposed based on the laboratory characterization and constitutive models published in the literature. The proposed model was implemented in FLAC 3D and used to simulate laboratory tests in order to verify and validate the implementation.

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3D computational modeling of powder compaction processes using a three-invariant hardening cap plasticity model

Cited by 17 publications

References 23 publications

Arbitrary Lagrangian–Eulerian method in plasticity of pressure-sensitive material: application to powder forming processes

Arbitrary Lagrangian–Eulerian method in plasticity of pressure-sensitive material: application to powder forming processes

Critical Review on Engineering Mechanical Quality of Green Compacts using Powder Properties

An elastoplastic and viscoplastic model for porous geomaterials

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