Hot-isostatic pressing diagrams: New developments

Helle, Aino; Easterling, K. E.; Ashby, Michael F.

doi:10.1016/0001-6160(85)90177-4

Cited by 677 publications

(336 citation statements)

References 10 publications

Supporting

Mentioning

319

Contrasting

Unclassified

Order By: Relevance

“…An improved version is given in Helle et al (1985). This model will be applied in the following to the problem of compaction of chondritic material.…”

Section: The Basic Assumptionsmentioning

confidence: 99%

“…In the derivation of the model of Helle et al (1985) it is assumed that the granular material initially consists of closely packed equal sized spheres. This special assumption is, however, not an irrevocable condition for its applicability, but mainly serves to define a relation between the filling factor D and the average number of contacts between a granular unit to its neighbours for a granular medium initially packed with a significant degree of porosity (i.e.…”

Section: The Basic Assumptionsmentioning

confidence: 99%

“…a material that does not have a special gradation of particle sizes chosen such as to achieve high filling factors as in the case of concrete). In technical applications, the model of Helle et al (1985) is applied successfully to granular materials that have some range of particle sizes.…”

Section: The Basic Assumptionsmentioning

confidence: 99%

“…The model of Helle et al (1985) assumes that there are no gross particle rearrangements by mutual rolling and gliding of particles in the granular material during the compaction process. Particle rearrangements (or granular flow) are responsible for compaction of loose powders with low filling factors.…”

Section: The Basic Assumptionsmentioning

confidence: 99%

See 3 more Smart Citations

Thermal evolution and sintering of chondritic planetesimals

Gail

Henke

Trieloff

2015

A&A

View full text Add to dashboard Cite

Context. Reconstruction of the thermal history of individual meteorites which can be assigned to the same parent body allows us to derive general characteristics of the parent body, such as its size and formation time, which hold important clues on the planetary formation process. This requires us to construct a detailed model of the heating of such a body by short lived radioactives, in particular by 26 Al, and its cooling by heat conduction, which may then be compared to the reconstructed cooling histories of the meteorites. Aims. The heat conductivity of the material from which planetesimals are composed depends critically on the porosity of the chondritic material. This changes during the process of compaction (also called sintering) of the material at elevated temperatures and pressures. Therefore, compaction of an initially granular material is a key process determining the thermal history of the parent bodies of meteorites. The most realistic modelling of sintering of chondritic material is required. Methods. The modelling of the compaction process is improved by applying concepts originally developed for the modelling of hot isostatic pressing in metallurgical processes, and by collecting data available from geosciences for the materials of interest. It is extended to a binary mixture of granular components of very different diameters -matrix and chondrules -as observed in chondrites.Results. By comparison with some published data on sintering experiments it is shown that the algorithm to follow the decrease of porosity of granular material during progressive sintering allows a sufficiently accurate modelling of the compaction of silicate material. The dependence of the compaction process on the nature of the precursor material, either matrix-dominated or chondruledominated, is discussed. It is shown that the characteristic temperature at which sintering occurs is different for matrix or chondruledominated precursor material. We apply the new method for calculating compaction to the evolution of the parent body of the H chondrites and determine an improved optimised set of model parameters for this body.

show abstract

“…An improved version is given in Helle et al (1985). This model will be applied in the following to the problem of compaction of chondritic material.…”

Section: The Basic Assumptionsmentioning

confidence: 99%

Section: The Basic Assumptionsmentioning

confidence: 99%

Section: The Basic Assumptionsmentioning

confidence: 99%

Section: The Basic Assumptionsmentioning

confidence: 99%

See 2 more Smart Citations

Thermal evolution and sintering of chondritic planetesimals

Gail

Henke

Trieloff

2015

A&A

View full text Add to dashboard Cite

show abstract

“…Some applications are found in modeling of ideal liquids [1,2], amorphous materials [3,4], granular media [5], emulsions [6], glasses [7], jamming [8], ceramic components [9,10] and densification processes during sintering [11,12]. The understanding of the final structure of the particles aggregation is important because its physical properties may depend on the packing features such as packing density, mean coordination number, porosity and radial distribution function (RDF).…”

Section: Introductionmentioning

confidence: 99%

Dynamic Simulation of Random Packing of Polydispersive Fine Particles

Ferraz

Marques

2017

Braz J Phys

View full text Add to dashboard Cite

In this paper, we perform molecular dynamics (MD) simulations to study the two-dimensional packing process of both monosized and random size particles with radii ranging from 1.0 µm to 7.0 µm. The initial positions as well as the radii of five thousand fine particles were defined inside a retangular box by using a random number generator. Both the translational and the rotational movement of each particle were considered in the simulations. In order to deal with interacting fine particles, we take into account both the contact forces and the long-range dispersive forces. We account for normal and static/sliding tangential friction forces between particles and between particle and wall by means of a linear model approach, while the long-range dispersive forces are computed by using a Lennard-Jones like potential. The packing processes were studied assuming different long-range interaction strengths. We carry out statistical calculations of the different quantities studied such as packing density, mean coordination number, kinetic energy and radial distribution function as the system evolves over time. We find that the long-range dispersive forces can strongly influence the packing process dynamics as they might form large particle clusters, depending on the intensity of the long-range interaction strength.

show abstract

Modelling of solid-phase sintering of hardmetal using a mesomechanics approach

Mähler¹,

Runesson

2000

Mech. Cohes.-Frict. Mater.

View full text Add to dashboard Cite

Hot-isostatic pressing diagrams: New developments

Cited by 677 publications

References 10 publications

Thermal evolution and sintering of chondritic planetesimals

Thermal evolution and sintering of chondritic planetesimals

Dynamic Simulation of Random Packing of Polydispersive Fine Particles

Modelling of solid-phase sintering of hardmetal using a mesomechanics approach

Contact Info

Product

Resources

About