A model for the simulation of powder compaction processes

Rossi, Rodrigo; Alves, Marcelo Krajnc; Al-Qureshi, H. A.

doi:10.1016/j.jmatprotec.2006.08.011

Cited by 16 publications

(12 citation statements)

References 12 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…X t & R n . As is customary in the literature of powder compaction modeling (Brown and Weber, 1988;Oliver et al, 1996;Bier and Hartmann, 2006;Rossi et al, 2007), we adopt the assumption of the local multiplicative decomposition of the deformation gradient of u, denoted by F, into plastic and elastic parts:…”

Section: Kinematics Of Plastic Large Deformationsmentioning

confidence: 99%

“…Parabolic plastic potential function Whereas the hypothesis of associated flow rule is generally accepted in the case of the elliptical cap, the direction of d p when the stress point lies on the Drucker-Prager envelope is plagued by much controversy. Some authors simply extend the validity of the associative assumption and consider that d p is normal to the failure line (Chtourou et al, 2002a;Erhart et al, 2005;Rossi et al, 2007). However, this hypothesis is clearly at odds with reality: it over-predicts the dilatational response of the material, as experimental studies carried out by Pavier (1998) and Sinka and Cocks (2007) evidence.…”

Section: Flow Rulementioning

confidence: 99%

See 1 more Smart Citation

Numerical modeling of crack formation in powder forming processes

Hernández

Oliver

Cante

et al. 2011

International Journal of Solids and Structures

View full text Add to dashboard Cite

a b s t r a c tThis paper presents a constitutive model describing the mechanical behavior of metal powders during (uniaxial) cold die compaction processes, placing special emphasis on the modeling of cracks formed during the ejection stage. The constitutive relationships are derived within the general framework of rateindependent, isotropic, finite strain elastoplasticity. The yield condition is determined by three surfaces intersecting non-smoothly in stress space, namely, an elliptical cap and the classical Von Mises and Drucker-Prager yield surfaces. The distinct irreversible processes are described in terms of two internal variables: an internal hardening variable, associated with accumulated compressive (plastic) strains, and an internal softening variable, linked with accumulated (plastic) shear strains. Motivated by both numerical and physical reasons, a parabolic plastic potential function is introduced to characterize the plastic flow on the linear Drucker-Prager failure surface. A thermodynamically consistent calibration procedure is employed to relate the softening modulus to fracture energy values obtained experimentally on Distaloy AE powder specimens. The predictive capability of the constitutive model is checked by simulating three representative cases: a diametral compression test, the ejection of an over-densified thin cylindrical part and the compaction of an axially symmetric multilevel part in an advanced CNC press machine. These simulations demonstrate the ability of the model to detect evidence of macroscopic cracks, clarify and provide reasons for the formation of such cracks, and evaluate, at least qualitatively, the influence of variations in the input variables on their propagation through the green compact.

show abstract

Section: Kinematics Of Plastic Large Deformationsmentioning

confidence: 99%

Section: Flow Rulementioning

confidence: 99%

Numerical modeling of crack formation in powder forming processes

Hernández

Oliver

Cante

et al. 2011

International Journal of Solids and Structures

View full text Add to dashboard Cite

show abstract

“…Several researchers have proposed and utilized finite element schemes for problems of large displacements [26][27][28][29][30][31] which include diverse formulations of both the Eulerian and Lagrangian type. In Eulerian procedure, the physical quantities are expressed as a function of time and position vector in the geometric space.…”

Section: Literature Reviewmentioning

confidence: 99%

Development of a finite element model of metal powder compaction process at elevated temperature

Rahman

Ariffin

Nor

2009

Applied Mathematical Modelling

View full text Add to dashboard Cite

a b s t r a c tThis paper presents the finite element modelling of metal powder compaction process at elevated temperature. In the modelling, the behaviour of powder is assumed to be rate independent thermo-elastoplastic material where the material constitutive laws are derived based on a continuum mechanics approach. The deformation process of metal powder has been described by a large displacement based finite element formulation. The Elliptical Cap yield model has been used to represent the deformation behaviour of the powder mass during the compaction process. This yield model was tested and found to be appropriate to represent the compaction process. The staggered-incremental-iterative solution strategy has been established to solve the non-linearity in the systems of equations. Some numerical simulation results were validated through experimentation, where a good agreement was found between the numerical simulation results and the experimental data.

show abstract

“…Most prior studies have focused on optimizing the compaction process conditions and geometries to obtain full density [2][3][4][5][6][7][8][9][10]. Kwon et al [11] and Lee et al [12] carried out simulations on a powder compaction process for complex shapes such as automobile parts, to predict their densities.…”

Section: Introductionmentioning

confidence: 99%

Pressure Transmission in the Compaction Process of Nickel Powder Using the Finite Element Methods

Baek¹,

Park

2019

Korean J. Met. Mater.

View full text Add to dashboard Cite

The compression process is one of the more widely used industrial manufacturing methods for fabricating desired shape of specimens with various materials such as metals and ceramics. In the compaction process, the upper punch moves into the powder, and force is transmitted between particles, then achieving densification. In this process, the powder can be considered to be in a particulate state, which means that while the powder consists of solids, it has characteristics quite similar to the fluid. Therefore, particles in the process can be seen as responding to hydrostatic pressure, and it can be assumed that the pressure is constant. However, the forces acted on the inter-particle continue to change during the process. Many parameters affect the force change, including compaction speed and the contact angle between particles. However, it is very difficult to verify these effects through experiments because it is impossible to arrange the inter-particle angle. Therefore, in this study, the force transmission mechanism was simulated in the compaction process using FEM simulation. To examine the contact angle and force transmission between the particles, a green compact was modeled as individual particles rather than as a continuum green compact. Finally, it was confirmed through analysis that the pressure transmission between the particles remained constant during the compression process.

show abstract

A model for the simulation of powder compaction processes

Cited by 16 publications

References 12 publications

Numerical modeling of crack formation in powder forming processes

Numerical modeling of crack formation in powder forming processes

Development of a finite element model of metal powder compaction process at elevated temperature

Pressure Transmission in the Compaction Process of Nickel Powder Using the Finite Element Methods

Contact Info

Product

Resources

About