Effect of particle shape on packing properties during tapping

Miyajima, Toshiaki; Sugimoto, Masunori

doi:10.1163/156855201745001

Cited by 24 publications

(9 citation statements)

References 7 publications

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“…Furthermore, although the measurement of bulk and tap density is comparably easy, especially for the tap density it is well known that powders often do not reach stable density values within a reasonable number of tapping cycles [22]. Miyajima [23] showed that the change in void volume fraction of packed powder beds can be estimated, but it might be necessary to apply [100 taps to reach a more or less stable situation depending on particle shape. The dependence of HR on particle shape was also approved by Zou and Yu [24].…”

Section: Hausner Ratio Hrmentioning

confidence: 99%

Powder flowability characterisation methodology for powder-bed-based metal additive manufacturing

et al. 2015

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Key in powder-bed-based additive manufacturing is the use of appropriate powder materials that fit to the process conditions. There are many parameters affecting the build process and the corresponding quality of the parts being built. Therefore, an accurate assessment of the powders becomes important. Such an assessment involves, besides others, the powder flowability, which should be sufficient in order to create good-quality powder layers. The current study aims at the development of suitable parameters and values for the qualification of metal powders for selective laser melting (SLM) with regard to their flowability. The powder flowability is assessed by the statistical analysis of the measured powder avalanche angles and the powder surface fractal, which give valuable information about the significance of inter-particle forces. A set of 21 different Fe-and Ni-based powders has been analysed and good correlations between the powder avalanche angles, the surface fractal and the particle shape with the optically evaluated flowability could be derived. The method allows a quantitative powder flowability assessment, which correlates with the experiences for powders for powder-bed-based additive manufacturing, especially for SLM.

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Section: Hausner Ratio Hrmentioning

confidence: 99%

Powder flowability characterisation methodology for powder-bed-based metal additive manufacturing

et al. 2015

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“…The particle shape controls the number of contacts per adjacent particle and the direction of those contacts relative to a line passing through the centre of two adjacent particles (Johanson, 2009). Particle shape, in particular circularity, affects the packing characteristics in terms of void fraction and bed height (Miyajima et al, 2001).…”

Section: Barriers To the Use Of Dem For Industrial Applicationsmentioning

confidence: 99%

Discrete Element Method (DEM) for Industrial Applications: Comments on Calibration and Validation for the Modelling of Cylindrical Pellets

Marigo

Stitt

2015

KONA

198

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As a consequence of increasing computer power and more readily useable commercial and open source codes, Discrete Element Method (DEM) is becoming widely used across a range of applications to simulate increasingly complex processes. This is exacerbating the challenge of setting up simulations for industrial applications. The literature on input parameter selection is divided. A number of papers report methods for their direct measurement. Others, by contrast, propose a "calibration" approach where the particle properties are derived as adjustable parameters by quantitative comparison of experimental and simulation results. This paper reports on the calibration and validation of the input parameters for the specific case of cylindrical tablets represented by conjoined spheres. The initial steps are to not only assign and optimise the DEM input parameters but also optimise the shape representation; what degree of linearity of the edges and angularity of the corners are required to accurately reflect the cylindrical shape. The model was used to simulate two configurations of a rotating drum: an "attrition tester" with a single longitudinal baffle and an un-baffled drum. The results were compared qualitatively and quantitatively with experimental data. While the qualitative comparison was good in most cases, detailed quantitative comparison fared less well, with some significant errors. This study highlights some of the key issues for a wider-spread of industrial applications for DEM.

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“…The effects of various factors on the average particle discharge rate N Ҁ were quantitatively investigated based on the multiple regression analysis [4] as follows. The analysis was restricted to the results of f ҃25kHz and Case-2 (see Fig.…”

Section: Discussionmentioning

confidence: 99%

Particle Discharge Characteristics from the Nozzle of a Thin Tube Immersed in Liquid Subjected to Ultrasonic Wave Force [Translated]<sup>†</sup>

Shiokari

Miyajima

Kawamura

et al. 2003

KONA

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Effect of particle shape on packing properties during tapping

Cited by 24 publications

References 7 publications

Powder flowability characterisation methodology for powder-bed-based metal additive manufacturing

Powder flowability characterisation methodology for powder-bed-based metal additive manufacturing

Discrete Element Method (DEM) for Industrial Applications: Comments on Calibration and Validation for the Modelling of Cylindrical Pellets

Particle Discharge Characteristics from the Nozzle of a Thin Tube Immersed in Liquid Subjected to Ultrasonic Wave Force [Translated]<sup>†</sup>

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