A study on the uniqueness of the plastic flow direction for granular assemblies of ductile particles using discrete finite-element simulations

Abdelmoula, Nouha; Harthong, Barthélémy; Imbault, D.; Dorémus, P.

doi:10.1016/j.jmps.2017.07.021

Cited by 23 publications

(13 citation statements)

References 42 publications

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“…The compaction of deformable matter has been addressed in experiments using ceramic, metallic, and pharmaceutical powders [1][2][3][4][5], gels [6][7][8], rubberlike particles [9][10][11][12], and even blood cells [13]. More recently, developments of numerical approaches based on meshless methods [14][15][16], the discrete element method [17,18], or the coupled finite element-discrete element methods [11,[19][20][21][22][23][24] have enabled the exploration of the physics of deformable granular media.…”

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confidence: 99%

Compaction Model for Highly Deformable Particle Assemblies

et al. 2020

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The compaction behavior of deformable grain assemblies beyond jamming remains bewildering, and existing models that seek to find the relationship between the confining pressure P and solid fraction ϕ end up settling for empirical strategies or fitting parameters. Using a coupled discrete-finite element method, we analyze assemblies of highly deformable frictional grains under compression. We show that the solid fraction evolves nonlinearly from the jamming point and asymptotically tends to unity. Based on the micromechanical definition of the granular stress tensor, we develop a theoretical model, free from ad hoc parameters, correctly mapping the evolution of ϕ with P. Our approach unveils the fundamental features of the compaction process arising from the joint evolution of grain connectivity and the behavior of single representative grains. This theoretical framework also allows us to deduce a bulk modulus equation showing an excellent agreement with our numerical data.

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confidence: 99%

Compaction Model for Highly Deformable Particle Assemblies

et al. 2020

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“…In addition, their comparison allowed the calibration of the MPFE-Model parameters in order to reproduce, with good accuracy, the process as a whole. To investigate further the evolution of the mechanical properties of the grains during compaction, a procedure based on [13] has been followed. An assembly of 50 spherical particles has been created using an algorithm implemented in YADE, which consists in generating randomly disposed particles in a cubic cell and growing their radii until contact between the particles is detected.…”

Section: Compaction Processmentioning

confidence: 99%

“…The plates' side is 1 mm and the spheres radius is 0.13 mm. All spheres were modelled using a linear elastic constitutive law with Mises plasticity and an isotropic power-law strain hardening, with the material parameters taken equal to those reported in [13]. Contact parameters were also taken from the cited article.…”

Section: Compaction Processmentioning

confidence: 99%

“…Multiple loading directions have been tested by performing restarts analysis from the end of step-2. The onset of plasticity for each loading direction has been detected following the procedure explained in [12,13] which is based on the total dissipation within the numerical model. The obtained yield surfaces of the MPFE-Model for the two values of final relative density D are reported in Figure 4 in a deviatoric stress/mean stress diagram.…”

Section: Compaction Processmentioning

confidence: 99%

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Investigating the ceramic processes by numerical approaches

Fusi¹,

Valli²,

Lucisano³

et al. 2019

FME Transactions

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The considerable increase in computers performance has led in recent decades to a growing diffusion of numerical modelling as a valuable tool to support the manufacturing industry. Among the industrial sectors that may take advantage of this methodology there is the ceramic one. In fact, the production of large format ceramic slabs have introduced new technological challenges in a sector already subject to complex productdevelopment procedures, often based on a trial and error approach. For this reason, numerical simulations have become an actual and attractive method to overcome practical limitations and give a deeper insight into each phase of the production process. In this paper, advanced application of numerical modelling applied to the ceramic industry are presented, with special consideration for the production of ceramic slabs. Advantages and limitations of the adopted numerical techniques are discussed.

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“…In this case, the discrete element method (DEM) can improve the particulate scale understanding of the powder compaction process [29][30][31][32][33][34][35], while the effectiveness of DEM numerical simulation is largely limited to small deformation or lower relative density than 0.85 [31]. In recent years, to alleviate the restrictions and difficulties involved in the FEM and DEM modelling, the socalled multiparticle finite element method (MPFEM) has been introduced to comprehensively simulate the compaction process of various powders such as pure copper [36][37][38], Al [39], iron [40], composite Fe/Al [41], Al/SiC [42], and other ductile and brittle [43][44][45] powder mixtures. e advantages of this approach can be attributed to combining the characteristics of FEM and DEM and intuitively presenting the powder movement, large deformation, and stress distribution from the particulate scale, while literature review indicated that to the best of our knowledge, fewer numerical studies have been reported in the compaction of TiC-316L composite powders from particulate scale, and the corresponding densification dynamics and mechanisms during compaction process are still far from fully understood.…”

Section: Introductionmentioning

confidence: 99%

Particulate Scale Numerical Investigation on the Compaction of TiC-316L Composite Powders

Wang

Han

et al. 2020

Mathematical Problems in Engineering

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This paper presents a numerical investigation on the 2D uniaxial die compaction of TiC-316L stainless steel (abbreviated by 316L) composite powders by the multiparticle finite element method (MPFEM). The effects of TiC-316L particle size ratios, TiC contents, and initial packing structures on the compaction process are systematically characterized and analyzed from macroscale and particulate scale. Numerical results show that different initial packing structures have significant impacts on the densification process of TiC-316L composite powders; a denser initial packing structure with the same composition can improve the compaction densification of TiC-316L composite powders. Smaller size ratio of 316L and TiC particles (R316L/RTiC = 1) will help achieve the green compact with higher relative density as the TiC content and compaction pressure are fixed. Meanwhile, increasing TiC content reduces the relative density of the green compact. In the dynamic compaction process, the void filling is mainly completed by particle rearrangement and plastic deformation of 316L particles. Furthermore, the contacted TiC particles will form the force chains impeding the densification process and cause the serious stress concentration within them. Increasing TiC content and R316L/RTiC can create larger stresses in the compact. The results provide valuable information for the formation of high-quality TiC-316L compacts in PM process.

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A study on the uniqueness of the plastic flow direction for granular assemblies of ductile particles using discrete finite-element simulations

Cited by 23 publications

References 42 publications

Compaction Model for Highly Deformable Particle Assemblies

Compaction Model for Highly Deformable Particle Assemblies

Investigating the ceramic processes by numerical approaches

Particulate Scale Numerical Investigation on the Compaction of TiC-316L Composite Powders

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