3D modelling of ceramic composites and simulation of their electrical, thermal and elastic properties

Müller, Th.; Raether, F.

doi:10.1016/j.commatsci.2013.08.013

Cited by 15 publications

(10 citation statements)

References 39 publications

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“…[19] As in our previous work, the interface energy curves E M (v) showed good convergence for RVE sizes of 32 3 and above. This edge-parallel orientation of the test lines together with using the linear intercept method avoids artefacts www.advancedsciencenews.com www.advtheorysimul.com due to the stepped interfaces of the voxel model.…”

Section: Monte Carlo Modelsupporting

confidence: 83%

Modeling Inherently Homogeneous Sintering Processes

Raether¹,

Seifert²

2018

Advcd Theory and Sims

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A novel Monte Carlo model for the simulation of sintering processes is introduced. Different from previous models, local interface curvature is considered in the acceptance of diffusion steps. This enables the investigation of the effects of interface energies on the sintering process. Sintering paths are calculated for various microstructures and interface energies. Results are interpreted in the framework of thermodynamic criteria for homogeneous sintering processes which were presented recently.Using Eq. (3), the grain boundary to surface energy ratio can be determined from the dihedral angle alone. [15] The surface energy

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Section: Monte Carlo Modelsupporting

confidence: 83%

Modeling Inherently Homogeneous Sintering Processes

Raether¹,

Seifert²

2018

Advcd Theory and Sims

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“…As the general method of modeling ceramic microstructures has already been described thoroughly in Ref. , we present here only briefly the steps necessary to generate models of microstructures close to that of real multi‐phase silicon nitride ceramics.…”

Section: Experimentals and Simulation Toolsmentioning

confidence: 99%

“…The microstructures of the RVEs are meshed with VoxSM , a new tool developed recently at Fraunhofer ISC . First, all interfaces are meshed with equi‐sized triangles.…”

Section: Experimentals and Simulation Toolsmentioning

confidence: 99%

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The influence of sintering additives on the microstructure and material properties of silicon nitride ceramics investigated by advanced simulation tools

Brockmann

Staab

Raether

2017

Physica Status Solidi (a)

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In multi‐phase bulk ceramics, the separate influence of individual phases on the overall macroscopic properties can often hardly be studied by purely experimental observations. However, once a realistic microstructure model exists, computer simulations allow for that by varying the properties of individual phases and, thus, for studying their role independently. In the present article, the microstructure of liquid phase sintered silicon nitride ceramics was created using a voxel‐based structure generator. These generated microstructures have been meshed with a special tool so that thermal conductivities and elastic properties of these ceramics could be calculated using standard finite element simulations. Variations of the properties of individual phases were considered in a realistic range for the experimental optimization of silicon nitride ceramics and, therefore, their respective influence on macroscopic properties could be studied. It turns out that a high volume fraction of the primary β‐Si3N4 ‐phase has the largest positive impact on both stiffness and thermal conductivity, whereas the effect of grain shape and anisotropic material properties of the β‐Si3N4 ‐grains is rather low. However, the thermal conductivity of the secondary phase plays a significant role in the overall thermal conductivity, provided that it drops beyond 10 W m·K−1. Nevertheless, experimentally the thermal conductivity of silicon nitride ceramics is dominated by the thermal conductivity of the β‐Si3N4 ‐grains, where the latter is controlled by impurities which can be incorporated into the silicon nitride lattice during sintering. Thus, inverse simulation can be used as a powerful tool to investigate individual phase properties in multiphase ceramics, for example, estimating a decreased thermal conductivity of the primary phase (β‐Si3N4 ‐grains).

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“…According to [1], there are four levels of the study of concretes: macrolevel, mesolevel, microlevel, and nanolevel. Mesolevel analysis of concrete is most popular because it can be used for further analysis of important properties of concrete such as deformation and damage resistance [2], mechanical properties [3], and electrical, thermal, and elastic properties [4]. At mesolevel, the concrete is treated as consisting of reinforced aggregates, mortar contents, and, optionally, interfacial zones between the aggregates and the mortar content, where the reinforced aggregates play the most important role.…”

Section: Introductionmentioning

confidence: 99%

A New Numerical Simulation Method for Three-Dimensional Mesoscale Analysis of Concretes

Song

Shen

et al. 2015

Mathematical Problems in Engineering

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This paper presents a method for generating a region with a lot of randomly distributed ellipsoids. Using the parametric expression of an ellipsoid, the criterion for determining if a spatial point is in the interior or exterior of the ellipsoid is established. Then the computation of the distance between a point and the ellipsoid is converted into finding the solution to an optimization problem, which can be efficiently approximated by the searching method. Based on these facts, the proposed method is able to make the distance between generated ellipsoids very small and then successfully improve the content of ellipsoids grains in the region. Numerical results show that the proposed method can generate simulation of specimens in which the content of ellipsoids is higher than 55% according to four-graded aggregates, 50% according to three-graded aggregates, and 45% according to two-graded aggregates, respectively, in relatively short time.

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3D modelling of ceramic composites and simulation of their electrical, thermal and elastic properties

Cited by 15 publications

References 39 publications

Modeling Inherently Homogeneous Sintering Processes

Modeling Inherently Homogeneous Sintering Processes

The influence of sintering additives on the microstructure and material properties of silicon nitride ceramics investigated by advanced simulation tools

A New Numerical Simulation Method for Three-Dimensional Mesoscale Analysis of Concretes

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