Transport Properties of CVI Preforms and Composites

1989 ◽  
Vol 168 ◽  
Author(s):  
G. B. Freeman ◽  
T. L. Starr ◽  
T. C. Elston
Keyword(s):  
Simple Model ◽  
Transport Properties ◽  
Material Properties ◽  
Gas Permeability ◽  
Layer Structure ◽  
Transport Coefficients ◽  
Experimental Measurements ◽  
Model Calculations ◽  
Component Material ◽  
Anisotropic Transport

AbstractA simple model, based on physical microstructure, that predicts the anisotropic transport properties of cloth lay-up composites is discussed. This anisotropic material is modeled as a layer structure consisting of two, or more, isotropic components. Composite transport coefficients perpendicular and parallel to the layers are given by “series” and “parallel” combining laws involving the isotropic coefficients of these component materials and their volume fractions. These component material properties are determined using microstructural information and fundamental material properties. Model calculations are compared to experimental measurements for gas permeability.

Effect of Electron-Phonon Coupling on Transport Properties of Monolayers of ZrS2, BiI3 and PbI2: A thermoelectric Perspective

2021 ◽  
Author(s):  
Gautam Sharma ◽  
Vineet Kumar Pandey ◽  
Shouvik Datta ◽  
Prasenjit Ghosh
Keyword(s):  
Relaxation Time ◽  
Band Structure ◽  
Transport Properties ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
Waste Heat ◽  
Transport Coefficients ◽  
Electrical Energy ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Thermoelectric materials are used for conversion of waste heat to electrical energy. The transport coefficients that determine their thermoelectric properties depend on the band structure and the relaxation time of...

Anisotropic transport properties of charge-ordered La 5/8− y Pr y Ca 3/8 MnO 3 ( y = 0.43) film

2015 ◽  
Vol 24 (5) ◽  
pp. 057304
Author(s):  
Yuan-Bo Liu ◽  
Shuan-Hu Wang ◽  
Ji-Rong Sun ◽  
Bao-Gen Shen
Keyword(s):  
Transport Properties ◽  
Anisotropic Transport

Interpreting equilibrium-conductivity and conductivity-relaxation measurements to establish thermodynamic and transport properties for multiple charged defect conducting ceramics

2015 ◽  
Vol 182 ◽  
pp. 49-74 ◽  
Author(s):  
Huayang Zhu ◽  
Sandrine Ricote ◽  
W. Grover Coors ◽  
Robert J. Kee
Keyword(s):  
Transport Properties ◽  
Material Properties ◽  
Ceramic Materials ◽  
Barium Zirconate ◽  
Charged Defect ◽  
Conductivity Measurements ◽  
Conductivity Relaxation ◽  
Kinetics Parameters ◽  
Relaxation Measurements ◽  
Thermodynamic And Transport Properties

A model-based interpretation of measured equilibrium conductivity and conductivity relaxation is developed to establish thermodynamic, transport, and kinetics parameters for multiple charged defect conducting (MCDC) ceramic materials. The present study focuses on 10% yttrium-doped barium zirconate (BZY10). In principle, using the Nernst–Einstein relationship, equilibrium conductivity measurements are sufficient to establish thermodynamic and transport properties. However, in practice it is difficult to establish unique sets of properties using equilibrium conductivity alone. Combining equilibrium and conductivity-relaxation measurements serves to significantly improve the quantitative fidelity of the derived material properties. The models are developed using a Nernst–Planck–Poisson (NPP) formulation, which enables the quantitative representation of conductivity relaxations caused by very large changes in oxygen partial pressure.

Anisotropic transport properties in tiltedc-axis MgB2thin films

2009 ◽  
Vol 23 (2) ◽  
pp. 025012 ◽  
Author(s):  
P Orgiani ◽  
Ke Chen ◽  
Yi Cui ◽  
Qi Li ◽  
V Ferrando ◽  
...  
Keyword(s):  
Transport Properties ◽  
Anisotropic Transport

Anisotropic Transport Properties of Cerium Kondo Compounds

1993 ◽  
pp. 255-264
Author(s):  
A. K. Bhattacharjee ◽  
B. Coqblin ◽  
S. M. M. Evans ◽  
C. Ayache ◽  
P. Haen ◽  
...  
Keyword(s):  
Transport Properties ◽  
Anisotropic Transport

scholarly journals Model Calculations of Elastic Moduli in Highly Deformed Composites

1989 ◽  
Vol 10 (2) ◽  
pp. 153-164 ◽  
Author(s):  
H. J. Bunge
Keyword(s):  
Plastic Deformation ◽  
Simple Model ◽  
Elastic Moduli ◽  
Opposite Sign ◽  
Internal Stresses ◽  
Minor Importance ◽  
High Increase ◽  
Two Phase ◽  
Linear Elasticity Theory ◽  
Model Calculations

Young's modulus of heavily deformed two-phase composites shows an unusually high increase after plastic deformation. It is assumed that this is due to two reasons, i.e. texture changes and changes of the moduli of the constitutive phases on the basis of non-linear elasticity theory and internal stresses of opposite sign in the phases. Expressions of the two contributions are given on the basis of simple model assumptions. It is estimated that the changes of shape and arrangement of the phases and shape and arrangement of the crystallites in the phases are only of minor importance.

A Simple Approach to Characterize Finite Compressibility of Elastomers

2003 ◽  
Vol 76 (4) ◽  
pp. 912-922 ◽  
Author(s):  
Mark R. Gurvich ◽  
Thomas S. Fleischman
Keyword(s):  
Carbon Black ◽  
Bulk Modulus ◽  
Experimental Verification ◽  
Material Properties ◽  
Numerical Approach ◽  
Simple Approach ◽  
Experimental Measurements ◽  
Axially Loaded ◽  
Different Levels

Abstract A hybrid experimental-numerical approach is proposed for accurate dimensionless characterization of rubber finite compressibility. Rubber specimens in the form of bonded rubber disks are considered as elastomeric structures with unknown material properties. These properties are calculated by matching results of FEA with experimental measurements of radial deformations of the axially-loaded disks. The approach may be used for reliable characterization of Poisson's ratio, bulk modulus, or other characteristics of interest. Implementation of the approach is considered for two representative elastomeric compounds with different levels of carbon black. Good experimental verification of the approach is shown at different levels of loading. Moreover, the same parameters of finite compressibility are independently obtained using both compressive and tensile loads. Higher compressibility is observed for a compound with larger content of carbon black as expected.

Correlation between morphology and anisotropic transport properties of diblock copolymers melts

Soft Matter ◽  
2019 ◽  
Vol 15 (5) ◽  
pp. 851-859 ◽  
Author(s):  
Mohammed Suliman Alshammasi ◽  
Fernando A. Escobedo
Keyword(s):  
Transport Properties ◽  
Diblock Copolymers ◽  
Molecular Simulations ◽  
Coarse Grained ◽  
Anisotropic Transport

Molecular simulations of coarse-grained diblock copolymers (DBP) were conducted to study the effect of segregation strength and morphology on transport properties.

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