Simulation of the elastic properties of porous ceramics with realistic microstructure

Jauffrès, David; Martín, Christophe; Lichtner, Aaron; Bordia, Rajendra K.

doi:10.1088/0965-0393/20/4/045009

Cited by 24 publications

(34 citation statements)

References 34 publications

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“…In addition, DES has been used to calculate the properties of partially sintered bodies. As DES predicts the grain size and its distribution quite well, excellent agreements have been found in the simulated and measured elastic properties, fracture toughness, compressive strength, and transport properties . The DES approach can be used to calculate the constitutive parameters and should be extended to predict anisotropic constitutive parameters (Section 3.5).…”

Section: Challenges and Outlookmentioning

confidence: 81%

Current understanding and future research directions at the onset of the next century of sintering science and technology

2017

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Sintering and accompanying microstructural evolution is inarguably the most important step in the processing of ceramics and hard metals. In this process, an ensemble of particles is converted into a coherent object of controlled density and microstructure at an elevated temperature (but below the melting point) due to the thermodynamic tendency of the particle system to decrease its total surface and interfacial energy. Building on a long development history as a major technological process, sintering remains among the most viable methods of fabricating novel ceramics, including high surface area structures, nanopowder-based systems, and tailored structural and functional materials. Developing new and perfecting existing sintering techniques is crucial to meet ever-growing demand for a broad range of technologically significant systems including, for example, fuel and solar cell components, electronic packages and elements for computers and wireless devices, ceramic and metal-based bioimplants, thermoelectric materials, materials for thermal management, and materials for extreme environments.In this study, the current state of the science and technology of sintering is presented. This study is, however, not a comprehensive review of this extremely broad field. Furthermore, it only focuses on the sintering of ceramics. The fundamentals of sintering, including the thermodynamics and kinetics for solid-stateand liquid-phase-sintered systems are described. This study summarizes that the sintering of amorphous ceramics (glasses) is well understood and there is excellent agreement between theory and experiments. For crystalline materials, attention is drawn to the effect of the grain boundary and interface structure on sintering and microstructural evolution, areas that are expected to be significant for future studies. Considerable emphasis is placed on the topics of current research, including the sintering of composites, multilayered systems, microstructure-based models, multiscale models, sintering under external stresses, and innovative and novel sintering approaches, such as field-assisted sintering. This study includes the status of these subfields, the outstanding challenges and opportunities, and the outlook of progress in sintering research. Throughout the manuscript, we highlight the important lessons learned from sintering fundamentals and their implementation in practice.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Challenges and Outlookmentioning

confidence: 81%

Current understanding and future research directions at the onset of the next century of sintering science and technology

2017

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“…The shape, location, and size distribution of pores, all play a significant role on the resultant material properties and of particular interest is the effect that pore anisotropy can have on mechanical performance . It has also been shown that in addition to porosity, the particle coordination plays an important role in determining the mechanical properties of partially sintered bodies …”

Section: Introductionmentioning

confidence: 99%

“…4,5 It has also been shown that in addition to porosity, the particle coordination plays an important role in determining the mechanical properties of partially sintered bodies. 6,7 Ceramics with anisotropic, directionally porous microstructures are often sought for their flow characteristics and open porous networks, however, their directional nature affects mechanical characteristics as well. 8 Multiple approaches are currently used to create anisotropic pores, many of which rely on various sol-gel, 9 gel-casting, 10 or additive manufacturing methods.…”

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confidence: 99%

Effect of Macropore Anisotropy on the Mechanical Response of Hierarchically Porous Ceramics

et al. 2015

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International audiencePorous ceramics are commonly used in electrochemical, catalytic, biological, and filtration processes, but in many cases, improvements to their designed performance come at the expense of their mechanical properties. By controlling the pore morphology and orientation, it is possible to mitigate some mechanical losses while maintaining adequately porous microstructures. Hierarchically, porous ceramics with similar porosities but differing macropore arrangements were synthesized using both freeze casting and slip casting, and then tested in compression to study the effects of macropore morphology and orientation on mechanical behavior. The mechanical properties of the anisotropic structures were a strong function of the orientation of the macropores relative to the applied stress. The properties of the isotropic hierarchical porous structures were in between the two orthotropic directions of the anisotropic porous ceramics. For the freeze-cast samples, the compressive strength was a function of the macropore size. The experimental results are rationalized using detailed microstructural analysis

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“…S, J, Jp are area, moment of inertia, and polar moment of inertia of the cross section; k is a dimensionless shear coefficient [19]. Then formulas (11) and (12)…”

Section: Long Bondsmentioning

confidence: 99%

Enhanced vector-based model for elastic bonds in solids

Kuzkin¹,

Кривцов²

2017

LoM

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A model (further referred to as the enhanced vector-based model or EVM) for elastic bonds in solids, composed of bonded particles is presented. The model can be applied for a description of elastic deformation of rocks, ceramics, concrete, nanocomposites, aerogels and other materials with structural elements interacting via forces and torques. A material is represented as a set of particles (rigid bodies) connected by elastic bonds. Vectors rigidly connected with particles are used for description of particles orientations. Simple expression for potential energy of a bond is proposed. Corresponding forces and torques are calculated. Parameters of the potential are related to longitudinal, transverse (shear), bending, and torsional stiffnesses of the bond. It is shown that fitting parameters of the potential allows one to satisfy any values of stiffnesses. Therefore, the model is applicable to bonds with arbitrary length / thickness ratio. Bond stiffnesses are expressed in terms of geometrical and elastic properties of the bonds using three models: Bernoulli-Euler beam, Timoshenko beam, and short elastic cylinder. An approach for validation of numerical implementation of the model is presented. Validation is carried out by a comparison of numerical and analytical solutions of four test problems for a pair of bonded particles. Benchmark expressions for forces and torques in the case of pure tension / compression, shear, bending and torsion of a single bond are derived. This approach allows one to minimize the time required for a numerical implementation of the model.

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Simulation of the elastic properties of porous ceramics with realistic microstructure

Cited by 24 publications

References 34 publications

Current understanding and future research directions at the onset of the next century of sintering science and technology

Current understanding and future research directions at the onset of the next century of sintering science and technology

Effect of Macropore Anisotropy on the Mechanical Response of Hierarchically Porous Ceramics

Enhanced vector-based model for elastic bonds in solids

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