scholarly journals Bounds for effective parameters of heterogeneous media by analytic continuation

1983 ◽  
Vol 90 (4) ◽  
pp. 473-491 ◽  
Author(s):  
K. Golden ◽  
G. Papanicolaou
Keyword(s):  
Analytic Continuation ◽  
Heterogeneous Media ◽  
Effective Parameters

Bounds for effective parameters of multicomponent media by analytic continuation

1985 ◽  
Vol 40 (5-6) ◽  
pp. 655-667 ◽  
Author(s):  
K. Golden ◽  
G. Papanicolaou
Keyword(s):  
Analytic Continuation ◽  
Effective Parameters ◽  
Multicomponent Media

Effective Electrodynamic Parameters of Nano-Composite Media and the Theory of Homogenisation

2019 ◽  
pp. 4-14 ◽  
Author(s):  
Leon A. Apresyan
Keyword(s):  
Heterogeneous Media ◽  
Transport Coefficients ◽  
Optoelectronic Devices ◽  
Initial Point ◽  
Dielectric Permeability ◽  
Nano Particles ◽  
Effective Parameters ◽  
Nano Composite ◽  
The Media ◽  
Percolation Thresholds

When creating new lighting and optoelectronic devices, great attention in recent years is paid to use nano-composite materials, i.e. the media containing impregnations of nanometre size, such as nano-particles of metals, quantum points, carbon nanotubes, graphenes, etc. This allows obtaining media with new, formerly unattainable characteristics. An initial point when describing properties of such medias is usually evaluation of their effective parameters (dielectric permeability, conductivity, heat conduction and of other similar transport coefficients) in the model of macroscopically heterogeneous media, in other words, media containing macroscopic impregnations with known or determined from experiments characteristics. Main approaches used in such cases are known Maxwell Garnett and Bruggeman approximations. In this review, methodical questions connected with various approaches to obtain these approximations and of their generalisations are discussed. Also some new results are given, which connected with evaluations of percolation thresholds within generalised Bruggeman approximations in the event of multi-component media.

Comparative study of the effective parameters on residual stress relaxation in welded aluminum plates under cyclic loading

2020 ◽  
Vol 21 (5) ◽  
pp. 505
Author(s):  
Yousef Ghaderi Dehkordi ◽  
Ali Pourkamali Anaraki ◽  
Amir Reza Shahani
Keyword(s):  
Residual Stress ◽  
Cyclic Loading ◽  
Stress Relaxation ◽  
Stress Amplitude ◽  
Cyclic Plasticity ◽  
Mean Stress ◽  
Effective Parameters ◽  
Perfect Plasticity ◽  
Residual Stress Relaxation ◽  
Aluminum Plates

The prediction of residual stress relaxation is essential to assess the safety of welded components. This paper aims to study the influence of various effective parameters on residual stress relaxation under cyclic loading. In this regard, a 3D finite element modeling is performed to determine the residual stress in welded aluminum plates. The accuracy of this analysis is verified through experiment. To study the plasticity effect on stress relaxation, two plasticity models are implemented: perfect plasticity and combined isotropic-kinematic hardening. Hence, cyclic plasticity characterization of the material is specified by low cycle fatigue tests. It is found that the perfect plasticity leads to greater stress relaxation. In order to propose an accurate model to compute the residual stress relaxation, the Taguchi L18 array with four 3-level factors and one 6-level is employed. Using statistical analysis, the order of factors based on their effect on stress relaxation is determined as mean stress, stress amplitude, initial residual stress, and number of cycles. In addition, the stress relaxation increases with an increase in mean stress and stress amplitude.

AN XFEM BASED MULTISCALE APPROACH TO FRACTURE OF HETEROGENEOUS MEDIA

2013 ◽  
Vol 11 (6) ◽  
pp. 565-580 ◽  
Author(s):  
Mirmohammadreza Kabiri ◽  
Franck J. Vernerey
Keyword(s):  
Heterogeneous Media ◽  
Multiscale Approach

Determination of the thermal conductivity of large volumes of heterogeneous media

2017 ◽  
pp. 48-50
Author(s):  
I.A. Zholobov ◽  
◽  
V.S. Zaitsev ◽  
Keyword(s):  
Thermal Conductivity ◽  
Heterogeneous Media

Vibroacoustic dynamics of heterogeneous media and NPP structures

2014 ◽  
Vol 2014 (1) ◽  
pp. 99-110
Author(s):  
Vladimir Sergeevich Fedotovskij ◽  
Tat’yana Nikolaevna Vereschagina ◽  
Svetlana Valer’evna Lunina ◽  
Evgeniya Aleksandrovna Ivanova
Keyword(s):  
Heterogeneous Media

Integral Transformation of Multidimensional Heat Conduction Problems in Heterogeneous Media

2017 ◽  
Author(s):  
Carolina Palma Naveira Cotta ◽  
Renato Machado Cotta ◽  
Anderson Pereira de Almeida
Keyword(s):  
Heat Conduction ◽  
Heterogeneous Media ◽  
Integral Transformation
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