Effective complex permittivity of two-phase random composite media: A test of the two exponent phenomenological percolation equation

2008 ◽  
Vol 103 (8) ◽  
pp. 084112 ◽  
Author(s):  
Viktor Myroshnychenko ◽  
Christian Brosseau
Keyword(s):  
Complex Permittivity ◽  
Composite Media ◽  
Two Phase ◽  
Random Composite

Wiener Bounds for Complex Permittivity in Terahertz Spectroscopy: Case Study of Two-Phase Pharmaceutical Tablets

2010 ◽  
Vol 64 (1) ◽  
pp. 127-131 ◽  
Author(s):  
Heikki Tuononen ◽  
Kaori Fukunaga ◽  
Marko Kuosmanen ◽  
Jarkko Ketolainen ◽  
Kai-Erik Peiponen
Keyword(s):  
Complex Permittivity ◽  
Terahertz Spectroscopy ◽  
Two Phase ◽  
Pharmaceutical Tablets

Thermal stresses in two‐phase composite media

1995 ◽  
Vol 18 (5) ◽  
pp. 639-653 ◽  
Author(s):  
June‐Liang Chu ◽  
Sanboh Lee
Keyword(s):  
Thermal Stresses ◽  
Composite Media ◽  
Two Phase

Comparison of experimental velocity measurements with theoretical results in a solid‐solid composite material

Geophysics ◽  
1996 ◽  
Vol 61 (5) ◽  
pp. 1429-1435 ◽  
Author(s):  
Mei Zhang ◽  
Daniel A. Ebrom ◽  
John A. McDonald ◽  
Robert H. Tatham
Keyword(s):  
Elastic Waves ◽  
Numerical Models ◽  
Resin Matrix ◽  
Composite Media ◽  
Velocity Measurements ◽  
Two Phase ◽  
Oblate Spheroidal ◽  
Aspect Ratios ◽  
Spheroidal Shape ◽  
Theoretical Results

Two‐phase composite media were constructed of aluminum powder inclusions embedded randomly in a clear resin matrix. The shapes of the inclusions are elongate, with aspect ratios ranging from 0.1 to 1.0, averaging about 0.25. The effective velocities of ultrasonic elastic waves in the bulk media were measured for these composite materials, and the observed data were compared to the theoretical values calculated using five different numerical models. The observed velocities agree with the theoretical values calculated using a dynamic model under the assumption that the inclusions have an oblate spheroidal shape.

Modeling of two-phase random composite materials by finite element, Mori–Tanaka and strong contrast methods

2013 ◽  
Vol 45 (1) ◽  
pp. 1117-1125 ◽  
Author(s):  
Bohayra Mortazavi ◽  
Majid Baniassadi ◽  
Julien Bardon ◽  
Said Ahzi
Keyword(s):  
Finite Element ◽  
Composite Materials ◽  
Two Phase ◽  
Random Composite ◽  
Strong Contrast

Exact relations between the thermoelectroelastic moduli of heterogeneous materials

1993 ◽  
Vol 441 (1913) ◽  
pp. 549-557 ◽  
Keyword(s):  
Thermal Expansion ◽  
Heterogeneous Media ◽  
Composite Media ◽  
Two Phase ◽  
Elastic Fields ◽  
Piezoelectric Coupling ◽  
Effective Thermal Expansion ◽  
The Individual ◽  
Exact Relations ◽  
Pyroelectric Response

Exact relations are obtained between the effective thermoelectroelastic moduli of two-phase heterogeneous media and their corresponding isothermal effective electroelastic moduli. The relations are obtained by generalizing the results of V. M. Levin, and B. W. Rosen and Z. Hashin to the inherently anisotropic coupling between the electric and elastic fields in thermoelectroelastic composites. The explicit expressions that are obtained can be used to obtain the effective thermal expansion and pyroelectric coefficients of the composite when the effective electroelastic (elastic, piezoelectric and dielectric) moduli are known, either by theory or experiment. The results also provide a means to assess the internal consistency of any micromechanics model that is proposed to estimate the thermoelectroelastic and electroelastic moduli of the composite. It is verified that when piezoelectric coupling is absent, the expressions reduce to those of B. W. Rosen and Z. Hashin for thermoelastic composite media. Finally, the resulting exact relations are exploited to prove the interesting phenomena that two-phase heterogeneous media can exhibit a net pyroelectric response even though neither of the individual phases exhibits pyroelectricity.

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