Meso-design of heterogeneous dielectric material systems: Structure property relationships

Baker, Jeffrey; Adkins, Jon Michael; Rabbi, Fazle; Liu, Qianlong; Reifsnider, Kenneth; Raihan, Rassel

doi:10.1142/s2010135x14500088

Cited by 7 publications

(10 citation statements)

References 22 publications

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“…In composite material systems, there are many initial interfaces, and as material damage develops, many new internal interfaces and surfaces develop. We have shown that each of these surfaces and interfaces is a location of charge accumulation (and possible motion), and that there is a corresponding change in the local electric field as one passes from one phase to another [1,2]. Moreover, we have found that the amount of local charge and local field can be calculated from first principles if the properties and morphology of the local phases are known [2].…”

Section: Introduction: Dielectric Properties Of Composite Materialsmentioning

confidence: 88%

“…The top and bottom of the domain were periodic boundaries free of applied charge. In order to accurately predict the capacitance, it is crucial to satisfy the discontinuous interfacial conditions at the interface between two different materials and to accurately account for the interactions between particles, fields, and boundaries, a capability that has been extensively validated for our algorithm [1,2]. The relative static permittivity of the matrix was set to 5 and its ε``value is set to 0.01.…”

Section: Wwwzamm-journalorgmentioning

confidence: 99%

“…We have shown that each of these surfaces and interfaces is a location of charge accumulation (and possible motion), and that there is a corresponding change in the local electric field as one passes from one phase to another [1,2]. Moreover, we have found that the amount of local charge and local field can be calculated from first principles if the properties and morphology of the local phases are known [2]. Hence, the measured permittivity or susceptibility of a given composite material is a state variable that is determined by how the composite is designed and manufactured, initially, and by what changes that material state as defects develop -uniquely, according to the history of a given specific physical sample.…”

Section: Introduction: Dielectric Properties Of Composite Materialsmentioning

confidence: 96%

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Dielectric signatures and interpretive analysis for changes of state in composite materials

et al. 2015

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A myriad of nondestructive interrogation methods have been developed to assess the initial and progressive integrity of composite materials, with varying degrees of success. Some frontiers, however, have stubbornly resisted this progress; the present paper addresses three of these by discussing our recent progress in the development and application of through-thickness dielectric methods for a wide range of heterogeneous materials. The first topic is the creation of a characterization method and interpretive analysis that can correctly reveal the process of distributed damage initiation and accumulation with non-dilute concentrations in heterogeneous structural composite materials, in contrast to more standard methods that focus on identifying individual flaws. The second topic is development of inverse and adjoint methods to enable the design of heterogeneous materials for specific dielectric responses. And the third topic is the development of a "current state method" for such materials that can provide measurements to predict the subsequent strength and life of individual specimens, in a manner that is somewhat analogous to a single crack analysis in homogeneous materials. The foundation for our discussion of those topics is through-thickness characterization of the low-frequency spectral dielectric response of composite materials to harmonic EMF signals. Successes and remaining challenges are discussed and opportunities for implementation identified.

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Section: Introduction: Dielectric Properties Of Composite Materialsmentioning

confidence: 88%

Section: Wwwzamm-journalorgmentioning

confidence: 99%

Section: Introduction: Dielectric Properties Of Composite Materialsmentioning

confidence: 96%

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Dielectric signatures and interpretive analysis for changes of state in composite materials

et al. 2015

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“…In a series of previous publications, we have applied equation (3) to some of the complex microstructures illustrated in Figure 1 at the conformal level, and have included electrochemical effects on the resulting flux terms shown in that equation. However, in this publication, we are only concerned with constructing a predictive method for time dependent electric charge distribution (including surface charge) in heterogeneous materials at the fundamental level, and the validation of such a method (Liu 2012;Liu 2011a;Reifsnider et al 2013;Baker et al 2014;Liu 2011b;Raihan et al 2014). Therefore, without loss of generality for the present discussion, we neglect all source terms and concern ourselves with the following simplified version of Eq.…”

Section: Methodsmentioning

confidence: 99%

Validated predictive computational methods for surface charge in heterogeneous functional materials: HeteroFoaM™

Reifsnider

Cacuci

Baker

et al. 2015

Mech Adv Mater Mod Process

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Background: Essentially all heterogeneous materials are dielectric, i.e., they are imperfect conductors that generally display internal charge displacements that create dissipation and local charge accumulation at interfaces. Over the last few years, the authors have focused on the development of an understanding of such behaviour in heterogeneous functional materials for energy conversion and storage, called HeteroFoaM (www.HeteroFoaM.com). Using paradigm problems, this work will indicate major directions for developing generally applicable methods for the multiphysics, multi-scale design of heterogeneous functional materials. Methods: The present paper outlines the foundation for developing validated predictive computational methods that can be used in the design of multi-phase heterogeneous functional materials, or HeteroFoaM, as a genre of materials. Such methods will be capable of designing not only the constituent materials and their interactions, but also the morphology of the shape, size, surfaces and interfaces that define the heterogeneity and the resulting functional response of the material system. Results: Relationships to applications which drive this development are identified. A paradigm problem based on dielectric response is formulated and discussed in context.

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“…Nevertheless, during its service life, the material interface is exposed to numerous variations induced by environmental changes. The charge storage usually occurs at the interfaces and defects of the material [4,5]. Interfacial polarization occurs at the interface, resulting in the dielectric relaxation of the heterogeneous material which enables the determination of the structure and electrical properties of the material.…”

Section: Bbds Of Composite Materials Systemmentioning

confidence: 99%

Predicting Adhesive Bond Performance Based on Initial Dielectric Properties

Banerjee¹,

Elenchezhian²,

Vadlamudi³

et al. 2017

American Society for Composites 2017

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In recent years, there has been a widespread growth in the application of composite materials particularly in the Aerospace and Automotive sectors. This is because composite structures are generally comparatively light in weight and provide corrosion and wear resistance as compared to metals or ceramics. Due to the strict fail-safe philosophy of the aerospace industry, the certification approach for current practice in joining composite materials is to thicken the joining areas and to use numerous fasteners which in turn increases the weight and stress concentrations in the structure. The use of adhesive bonding can improve the stress distribution between the composite materials / dissimilar materials and can contribute to a lighter structure. However, there much investigation is yet to be done in this discipline to predict the bond strength and performance using non-destructive evaluation methods. This paper will focus on an approach to study the mechanical as well as the dielectric properties of an adhesive bond. The dielectric testing is done by using Broadband Dielectric Spectroscopy (BbDS), wherein the dielectric characteristics of the material are analyzed in a wide frequency spectrum. The data obtained by this technique are used to demonstrate the charge transport, the combined dipolar fluctuation, and the effects of polarization occurring between the boundaries of materials. The continuous modifications of the dielectric spectra are due to the changes in the electrical and structural interactions between the particles, shapes, and orientations of the constituent phases of the morphological structure of the material system. Information about the morphologies, impurities/contamination or interaction of the dissimilar surfaces of the pristine bond can be obtained from the initial BbDS properties. The dielectric properties for adhesively bonded composites with different surface adhesion properties have shown promising evidence of predicting the final mechanical performance of the bonded material system. The success and limitations of this approach will be discussed, and needs for continued investigation identified

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Meso-design of heterogeneous dielectric material systems: Structure property relationships

Cited by 7 publications

References 22 publications

Dielectric signatures and interpretive analysis for changes of state in composite materials

Dielectric signatures and interpretive analysis for changes of state in composite materials

Validated predictive computational methods for surface charge in heterogeneous functional materials: HeteroFoaM™

Predicting Adhesive Bond Performance Based on Initial Dielectric Properties

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