A density-dependent modified Drucker-Prager Cap model for die compaction of Ag57.6-Cu22.4-Sn10-In10 mixed metal powders

Zhou, Miaolei; Hu, Jianhua; Lei, Yu; Xiao, Yong; Li, Bei; Yan, Shiwei; Zou, Fangli

doi:10.1016/j.powtec.2016.09.061

Cited by 40 publications

(36 citation statements)

References 55 publications

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“…Actually, the frictional coefficient is variable and determined by particle characteristics, lubricant content and pressures in contact interface (Cunningham et al, 2004). The Janssen-Walker theory was employed to measure the die wall/powder frictional coefficient with the strain-gauge measurement method (Zhou et al, 2017). The result showed that the die wall/powder frictional coefficient increased with the increasing of relative density, and a small increase occurred when the relative density was over 0.8.…”

Section: Multi-particle Finite Element Modeling Of Fe Powder Compactionmentioning

confidence: 99%

Experimental and numerical investigation of densification behaviors during powder compaction

Lei

Yan

Huang

et al. 2018

JAMDSM

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With the rapid development of manufacturing technology powder compaction has been a highly-developed forming technology for manufacturing net shape or near net shape parts with complex geometries and special mechanical performances. An experimental and numerical investigation was made to study the densification behaviors during powder compaction. A series of compaction tests were carried out. A numerical model using multi-particle finite element model (MPFEM) was presented for densification analysis, particles were discretized with fine elements for precise description of inter-particle interactions, and three initial packing structures (hexagonal, tetragonal, and random) were considered in the numerical model. The simulation results of the multi-particle finite element model with random packing structure were in good agreement with experimental results, and can give further insight into the particle-level densification mechanism behind the macroscopic phenomenon in physical compaction tests. Particles' flow behavior, stress field and energy conversion, that are related to the particle rearrangement, contact interactions and local plastic deformation, were detailed analyzed with the numerical model. The effects of friction, particle size and compacting velocity on compaction densification were discussed, and response surface studies of inter-particle friction, particle size and compacting velocity were completed for compaction process optimization.

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Section: Multi-particle Finite Element Modeling Of Fe Powder Compactionmentioning

confidence: 99%

Experimental and numerical investigation of densification behaviors during powder compaction

Lei

Yan

Huang

et al. 2018

JAMDSM

Self Cite

View full text Add to dashboard Cite

show abstract

“…Current praxis for calibration relies on the extensive experiments performed on green body apt to quantify the parameters, which are regarding the only single value of relative density (see e.g. [19,[21][22]29]). In order to quantify them over a wider range, it is required to perform a significant amount of experiments, with some values of relative density difficult to test.…”

Section: Experimental Procedures 21 Constitutive Model and The Assesmentioning

confidence: 99%

“…Additional press tests were performed utilizing the configuration 1 to produce cylindrical green bodies with different levels of relative density, specifically: 0.73, 0.78, 0.83, 0.88 and 0.93, to be further subjected to Brazilian test and Crush test. On the basis of these tests, through the procedure explained in [21], following constitutive parameters are calculated: cohesion (d 0 ), friction angle (α) and hydrostatic pressure yield stress (p b ). These values served as a reference to compare against those assessed through a novel procedure presented here.…”

Section: Adopted Experiments and Related Numerical Modelingmentioning

confidence: 99%

“…Calibration of such models is a difficult task, often involving a large number of experiments [20]. As current praxis, the calibration of constitutive models used for powder pressing involves a series of destructive tests performed on green bodies [19,[21][22]. An additional complication is encountered for certain powder mixtures where particles deform and undergo viscous flow to the die wall, effectively changing friction during the pressing.…”

Section: Introductionmentioning

confidence: 99%

“…Developed procedure is experimentally verified with reference to the modified Drucker-Prager CAP model already employed by several authors for cold pressing simulations (see e.g. [19,[21][22]). With additional complexity adopted in this study, with respect to previous works, the number of parameters to identified equals 19.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reduced order numerical modeling for calibration of complex constitutive models in powder pressing simulations

Pandey¹,

Buljak²,

Balać³

2017

SCI SINTER

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Numerical simulations of different ceramic production phases often involve complex constitutive models, with difficult calibration process, relying on a large number of experiments. Methodological developments, proposed in present paper regarding this calibration problem can be outlined as follows: assessment of constitutive parameters is performed through inverse analysis procedure, centered on minimization of discrepancy function which quantifies the difference between measurable quantities and their computed counterpart. Resulting minimization problem is solved through genetic algorithms, while the computational burden is made consistent with constraints of routine industrial applications by exploiting Reduced Order Model (ROM) based on proper orthogonal decomposition. Throughout minimization, a gradual enrichment of designed ROM is used, by including additional simulations. Such strategy turned out to be beneficial when applied to models with a large number of parameters. Developed procedure seems to be effective when dealing with complex constitutive models, that can give rise to non-continuous discrepancy function due to the numerical instabilities. Proposed approach is tested and experimentally validated on the calibration of modified Drucker-Prager CAP model, frequently adopted for ceramic powder pressing simulations. Assessed values are compared with those obtained by traditional, timeconsuming tests, performed on pressed green bodies.

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Study on the densification behavior of aluminum powders using microwave hot pressing process

Abedinzadeh

2018

Int J Adv Manuf Technol

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A density-dependent modified Drucker-Prager Cap model for die compaction of Ag57.6-Cu22.4-Sn10-In10 mixed metal powders

Cited by 40 publications

References 55 publications

Experimental and numerical investigation of densification behaviors during powder compaction

Experimental and numerical investigation of densification behaviors during powder compaction

Reduced order numerical modeling for calibration of complex constitutive models in powder pressing simulations

Study on the densification behavior of aluminum powders using microwave hot pressing process

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