scholarly journals Limit transitions in plane homogenization problems for two-phase dielectric composites with extreme material properties of one phase

2021 ◽  
Vol 1847 (1) ◽  
pp. 012039
Author(s):  
A B Kudimova ◽  
A V Nasedkin
Keyword(s):  
Material Properties ◽  
Two Phase ◽  
Homogenization Problems

Theoretical Meso-Model of Al2O3/ZrO2 Ceramic Response under Compression

2014 ◽  
Vol 601 ◽  
pp. 92-95
Author(s):  
Tomasz Sadowski ◽  
Liviu Marsavina
Keyword(s):  
Grain Boundary ◽  
Material Properties ◽  
Mechanical Model ◽  
Constitutive Relations ◽  
Ceramic Composites ◽  
Theoretical Modeling ◽  
Polycrystalline Structure ◽  
Two Phase

This paper presents theoretical modeling of two-phase ceramic composites subjected to compression. The meso-mechanical model allows for inclusion of all microdefects in the polycrystalline structure that exists at the grain boundary interfaces and inside the grains. The constitutive relations for the Al2O3/ZrO2composite with the gradual degradation of the material properties due to different defects development were formulated.

Numerical Studies of the Correlation between Inclusion Shape and Effective Elastic Properties of the Particle Reinforced Composites

2019 ◽  
Vol 827 ◽  
pp. 234-239
Author(s):  
Romana Piat ◽  
Pascal A. Happ
Keyword(s):  
Material Properties ◽  
Three Dimensional ◽  
Reinforced Composites ◽  
Two Phase ◽  
Smooth Structures ◽  
Irregular Shapes ◽  
Numerical Studies ◽  
Effective Material Properties ◽  
Particle Reinforced Composites ◽  
Inclusion Shape

In present paper the effect of inclusions with irregular shapes on the elastic material properties of two-phase composites is studied. The irregular shapes of the real inclusions were approximated using smooth three-dimensional structures. For this needs the images of the microscopic particles were numerically approximated through smooth structures using methods of the computer algebra and were used for the following FE studies. The reference elements with typical inclusions with irregular shapes were determined and used for calculation of the effective material properties.

Multiscale Modelling of Gradual Degradation in Al2O3/ZrO2 Ceramic Composites under Tension

2010 ◽  
Vol 638-642 ◽  
pp. 2743-2748
Author(s):  
Tomasz Sadowski ◽  
Liviu Marsavina
Keyword(s):  
Material Properties ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
Multiscale Approach ◽  
Solid Modelling ◽  
Induced Anisotropy ◽  
Two Phase ◽  
State Of Stress ◽  
Ceramic Composite Materials ◽  
As Stress

Two-phase ceramic composite materials, (CMC, e.g. Al2O3/ZrO2), have a non-linear and complex overall response to applied loads due to: different phases, existence of an inital porosity, development of limited plasticity and internal microdefects. All microdefects act as stress concentrators and locally change the state of stress, leading to the development of mesocracks and finally macrocracks. Experimental results show that defects develop mainly inter-granular and cause inhomogeneity and induced anisotropy of the solid. Modelling of such material response is possible by multiscale approach describing different phenomena occuring at different scales: micro- meso- and macro- ones. The paper presents uniaxial tension process of the Al2O3/ZrO2 composite with the gradual degradation of the material properties due to different defects development.

Anisotropic Damage Model for Concrete Affected by Alkali-Aggregate Reaction

2010 ◽  
Vol 20 (4) ◽  
pp. 598-617 ◽  
Author(s):  
Claudia Comi ◽  
Umberto Perego
Keyword(s):  
Chemical Reaction ◽  
Material Properties ◽  
Damage Model ◽  
Experimental Tests ◽  
Anisotropic Damage ◽  
Damage Development ◽  
Two Phase ◽  
Alkali Aggregate Reaction ◽  
Significant Damage ◽  
Strength And Stiffness

An anisotropic two-phase coupled chemo-thermo-damage model is proposed, for the simulation of the behavior of concrete affected by the alkali-aggregate reaction, which may create significant damage in existing concrete structures. The chemical reaction produces a gel expanding in the concrete pores, leading to macroscopic strength and stiffness deterioration in the concrete skeleton. The model is capable to account for the anisotropic damage development and consequent directional degradation of material properties. The model is validated against experimental tests taken from the literature.

Interface Transition Zone and the Elastic Modulus of Cement-Based Composites

1994 ◽  
Vol 370 ◽  
Author(s):  
Peter I. Simeonov ◽  
S.H. Ahmad
Keyword(s):  
Experimental Data ◽  
Elastic Modulus ◽  
Transition Zone ◽  
Material Properties ◽  
General Trend ◽  
Two Phase ◽  
Interface Transition Zone ◽  
The Matrix ◽  
Approach Zero ◽  
Highly Porous

AbstractThe influence of the Interface Transition Zone (ITZ) on the elastic modulus of concrete is demonstrated as a divergence of the experimental data from the general trend of the theoretical Hashin-Shtrikman bounds. This divergence is well related to the W/C of the composite. With reduction of W/C the influence of ITZ decreases and for values close to 0.4 and lower it is insignificant.The formation of the ITZ is characterized by a transfer of water from the matrix to the surface of the aggregates. As a result of this a highly porous ITZ is formed while the matrix remains with a reduced porosity. This process can also be described as a transfer of material properties. For some compositions the balance of this transfer can approach zero. The imbalance in this process is more pronounced at higher W/C.The effect of Interface Transition Zone can be successfully simulated by the help of recently derived Hashin's variational bounds for two-phase composites with imperfect interfaces.

scholarly journals More than just oil droplets in water: surface tension and viscosity of protein condensates quantified by micropipette aspiration

2021 ◽  
Author(s):  
Huan Wang ◽  
Fleurie M Kelley ◽  
Dragomir Milovanovic ◽  
Benjamin S Schuster ◽  
Zheng Shi
Keyword(s):  
Surface Tension ◽  
Phase Separation ◽  
Liquid Phase ◽  
Material Properties ◽  
Water Surface ◽  
Phase System ◽  
Surface Wetting ◽  
Two Phase ◽  
Quantitative Studies ◽  
Liquid Liquid Phase Separation

The material properties of biomolecular condensates play pivotal roles in many biological and pathological processes. Despite the rapid increase in the number of biomolecules identified that undergo liquid-liquid phase separation (LLPS), quantitative studies of the resulting condensates have been severely lagging behind. Here, we develop a micropipette-based technique, which uniquely allows quantifications of both the surface tension and viscosity of biomolecular condensates, independent of labeling and surface wetting effects. We demonstrate the accuracy and versatility of this technique by measuring condensates of LAF-1 RGG domains and a polymer-based aqueous two-phase system (ATPS). We anticipate this technique will be widely applicable to biomolecular condensates and will resolve several limitations regarding current approaches.

Design and analysis of metamaterials for wireless power transfer with same resonance frequency but different L/C combinations

2020 ◽  
Vol 64 (1-4) ◽  
pp. 377-384
Author(s):  
Wenjia Yang ◽  
S.L. Ho ◽  
W.N. Fu ◽  
Shiyou Yang
Keyword(s):  
Robust Design ◽  
Material Properties ◽  
Power Transmission ◽  
Operating Conditions ◽  
Wireless Power ◽  
Two Phase ◽  
Analysis And Design ◽  
Unique Material ◽  
Unit Cells ◽  
Conventional Material

Metamaterial is an artificial material with unique material properties that cannot be found in a naturally existing one, and hence it is able to perform functions that a conventional material cannot do. Consequently, it has shown great potential in various engineering applications such as resonance coupled mid-range wireless power transmission (R-WPT) systems. However, the analysis and design of an application-oriented metamaterial include both the unit cells and their combinations, and thus are very complex. Moreover, the performance of a metamaterial is very sensitive to uncertainties in both manufacturing and operating conditions. In this regard, a two-phase methodology for robust design optimizations of metamaterial slabs in R-WPT applications is proposed and applied to the design optimization of a prototype R-WPT system with promising results.

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