Simulated effective elastic moduli and wave velocities in water-saturated sintered glass-beads

Kurashige, Michio; Hayashi, Takumi; Imai, Kiyoko

doi:10.1007/bf01186966

Cited by 11 publications

(16 citation statements)

References 50 publications

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“…This simulation method, which is composed of "geometrical model construction in a computer", "finite element analysis of an extracted particle pair", and "structural analysis of a random network", was proposed by Kurashige et al (10) and Kato et al. (11) to predict effective elastic moduli of randomly packed identical sphere aggregates.…”

Section: Introductionmentioning

confidence: 99%

Statistical Properties of Random Packing and Macroscopic Thermal Conductivity of Sintered Balloons (Re-Examination)

Taguchi¹,

Kurashige

2008

JMMP

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This paper simulates the macroscopic thermal conductivities of randomly-packed, sintered balloons for various degrees of sintering and for a wide range of the balloon inner/outer diameter ratio. Although this problem was already studied by Ono et al., we found some errors in their paper, including a critical one. Thus, we re-examine the same theme and correct all errors. Furthermore, we extend its contents and discuss the results in more detail. For practical purposes, we present all the macroscopic conductivities in terms of a simple expression of two balloon's geometrical parameters. "Specific" macroscopic thermal conductivities (i.e., those per weight) are precisely estimated and found to have a peak when the balloons have the diameter ratio larger than approximately 0.8.

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Section: Introductionmentioning

confidence: 99%

Statistical Properties of Random Packing and Macroscopic Thermal Conductivity of Sintered Balloons (Re-Examination)

Taguchi¹,

Kurashige

2008

JMMP

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“…To avoid this difficulty, Kurashige et al [4] proposed a simulation method to calculate the elastic properties of a random packing of identical spheres by replacing the real arrangement by a random network of springs of six degrees of freedom. The results by this simulation were in good agreement with experimental ones.…”

Section: Introductionmentioning

confidence: 99%

“…Kurashige et al [5] and Kato et al [6] extracted some statistical characteristics of random packing structures from the data on the random packings; no statistical information of the packings can be provided by other models such as the self-consistent model. In addition, they estimated thermal and mechanical properties by the same evaluation method as that in [4] and discussed relations of them to the statistical characteristics. The thermal conductivity and elastic moduli of the sintered aggregates are of transverse isotropy, which is caused by the deviated microstructures of the packings.…”

Section: Introductionmentioning

confidence: 99%

“…A secondary step may involve pressureless sintering or severe plastic deformation at high temperature, depending on final applications [9][10][11][12][13]. The above simulations [4][5][6] do not take into account effects of the compaction on the macroscopic mechanical properties. This paper deals with microstructures and macroscopic conductivity of randomly-packed, uniaxially-compacted/sintered particles.…”

Section: Introductionmentioning

confidence: 99%

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Microstructures and macroscopic conductivity of randomly packed and uniaxially pressed sphere compacts

Taguchi¹,

Kurashige²

2007

International Journal of Heat and Mass Transfer

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The present paper deals with simulation of microstructures and macroscopic conductivity of randomly packed, uniaxially pressed and sintered particles. Random packings of identical spheres are constructed by using a sequential deposition method and their microgeometry after the compaction in sintering is geometrically created by proportional reduction in distances between the sphere centers only in the vertical direction and by mass addition around overlapped necks. Some of microgeometrical characteristics of the created compacts are statistically examined. Using the data on the packings and geometrical models, macroscopic thermal conductivities of the compacts are estimated. It is found that the conductivities are greatly different from those of simple cubic packings, although both the packings have almost the same coordination number, and that anisotropy in the conductivity is induced by the compaction in addition to gravity. The conductivities are expressed as a function of the compaction and sintering degrees for practical purposes. Keywords

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“…Furthermore, the microstructural modeling is a cumbersome task (e.g., image-based modeling); we need large computational cost. Kurashige et al (11) proposed a three step simulation method to predict effective elastic moduli of randomly packed identical sphere aggregates. Kato et al (12) extracted a statistical characteristic of the random packing structure from data on the random packing; they also estimated the mechanical properties (effective elastic moduli and elastic wave speeds) by the same evaluation method as that in Kurashige et al (11) .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Macroscopic Elastic Properties of Porous Compacts Prepared by Powder Pressure Sintering for Biomedical Implant

Taguchi

Kurashige

2007

JMMP

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Macroscopic elastic properties of porous compacts prepared by applying uniaxial pressure in powder sintering are numerically estimated, with their biomedical application in mind. The estimation is based on a three step simulation method similar to the previous one. It is found that the compaction by the pressure and the sintering lead to increase in the macroscopic elastic moduli in the pressure direction, which is made to coincide with that of gravity in packing. It is also found that these moduli are larger than those in the direction normal to the pressure by 20% to 40%. Those for the less sintered compacts whose porosity ranges from approximately 32% to 37 % fall in those of human cortical bone and show similar behavior to those of artificial implants.

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Simulated effective elastic moduli and wave velocities in water-saturated sintered glass-beads

Cited by 11 publications

References 50 publications

Statistical Properties of Random Packing and Macroscopic Thermal Conductivity of Sintered Balloons (Re-Examination)

Statistical Properties of Random Packing and Macroscopic Thermal Conductivity of Sintered Balloons (Re-Examination)

Microstructures and macroscopic conductivity of randomly packed and uniaxially pressed sphere compacts

Evaluation of Macroscopic Elastic Properties of Porous Compacts Prepared by Powder Pressure Sintering for Biomedical Implant

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