Finite element simulation of metal powder forming

Chenot, Jean‐Loup; Bay, François; Fourment, Lionel

doi:10.1002/nme.1620300820

Cited by 39 publications

(20 citation statements)

References 14 publications

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“…A number of constitutive models have been developed and tested to describe the e ect of stress state on the response of the powder material. Many researchers have proposed several models including micro-mechanical models [9,10] and macro-mechanical models such as elastic, plastic or visco-plastic models [2][3][4][5]. Elasto-plastic models based on porous or frictional materials are commonly used to describe powder material behaviour in cold compaction processes.…”

Section: Constitutive Models For Powdermentioning

confidence: 99%

“…Many studies of powder compaction have been made [1][2][3][4][5][6], most of them concerned with the relationship between compacting pressure rule, which indicate the direction of the plastic strain. In order to adequately reproduce powder material behaviour under cyclic loading, as a sequence of loading=unloading=reloading, modiÿcations have to be introduced to the classical constitutive models.…”

Section: Introductionmentioning

confidence: 99%

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An endochronic plasticity model for numerical simulation of industrial powder compaction processes

Khoei¹,

Bakhshiani²,

Mofid³

2003

Commun. Numer. Meth. Engng.

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SUMMARYIn this paper, the numerical modelling of powder forming process is simulated by a ÿnite element analysis using an endochronic plasticity model. A general algorithm for the endochronic theory from the viewpoint of e cient numerical modelling is presented. Constitutive equations are established based on coupling between deviatoric and hydrostatic behaviour to the endochronic theory. Finally, the numerical schemes are examined for e ciency in the modelling of a rotational anged-component. It is shown how the endochronic plasticity describes the behaviour of powder material from the initial stage of compaction to ÿnal stage, in which material behaves as solid metals.

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Section: Constitutive Models For Powdermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An endochronic plasticity model for numerical simulation of industrial powder compaction processes

Khoei¹,

Bakhshiani²,

Mofid³

2003

Commun. Numer. Meth. Engng.

View full text Add to dashboard Cite

show abstract

“…Several constitutive models for the cold compaction of metal powders have been proposed, including: microscopic models [1][2][3][4], flow formulations [5] and solid mechanics models [6][7][8][9][10]. A visco-plastic model was developed by Storakers et al [11] for the densification of spherical powders.…”

Section: Introductionmentioning

confidence: 99%

A three-invariant hardening plasticity for numerical simulation of powder forming processes via the arbitrary Lagrangian–Eulerian FE model

Khoei

Azami

Anahid

et al. 2006

Int. J. Numer. Meth. Engng

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SUMMARYIn this paper, a three-invariant cap plasticity model with an isotropic hardening rule is presented for numerical simulation of powder compaction processes. A general form is developed for single-cap plasticity which can be compared with some common double-surface plasticity models proposed for powders in literature. The constitutive elasto-plastic matrix and its components are derived based on the definition of yield surface, hardening parameter and non-linear elastic behaviour, as function of relative density of powder. Different aspects of the new single plasticity are illustrated by generating the classical plasticity models as special cases of the proposed model. The procedure for determination of powder parameters is described by fitting the model to reproduce data from triaxial compression and confining pressure experiments. The three-invariant cap plasticity is performed within the framework of an arbitrary Lagrangian-Eulerian formulation, in order to predict the non-uniform relative density distribution during large deformation of powder die pressing. In ALE formulation, the reference configuration is used for describing the motion, instead of material configuration in Lagrangian, and spatial configuration in Eulerian formulation. This formulation introduces some convective terms in the finite element equations and consists of two phases. Each time step is analysed according to Lagrangian phase until required convergence is attained. Then, the Eulerian phase is applied to keep mesh configuration regular. Because of relative displacement between mesh and material, all dependent variables such as stress and strain are converted through the Eulerian phase. Finally, the numerical schemes are examined for efficiency and accuracy in the modelling of a rotational flanged component, an automotive component, a conical shaped-charge liner and a connecting-rod.

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“…On the other hand, the numerical studies for the ÿnite element analysis is now well established, which mostly adopts the homogeneous compressible continuum models [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Application of upper bound method to the powder‐forging of cup‐shaped axisymmetric preforms for estimating punch load

Cho

Jeong

2001

Numerical Meth Engineering

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SUMMARYThis paper is concerned with the analytic derivation of the punch load required to forge cup-shaped axisymmetric porous preforms. Splitting the two-dimensional preform domain into three rectangular regions, we assumed the kinematically admissible velocity ÿelds to apply the upper bound method. According to the resulting formulas, we developed an incremental numerical algorithm for computing time-discretized step-wise punch loads and preform volumes. In order to illustrate the validity of the proposed estimate, we compared the numerical results obtained by the present analysis with those by the ÿnite element simulation. From the comparison made through di erent preform dimensions, we observed that the present analysis expects the reliable upper bounds of process step-wise punch loads.

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Finite element simulation of metal powder forming

Cited by 39 publications

References 14 publications

An endochronic plasticity model for numerical simulation of industrial powder compaction processes

An endochronic plasticity model for numerical simulation of industrial powder compaction processes

A three-invariant hardening plasticity for numerical simulation of powder forming processes via the arbitrary Lagrangian–Eulerian FE model

Application of upper bound method to the powder‐forging of cup‐shaped axisymmetric preforms for estimating punch load

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