A New Technique for Characterization of Low Impedance Materials at Acoustic Frequencies

Nantasetphong, Wiroj; Jia, Zhanzhan; Hasan, M. Arif; Amirkhizi, Alireza V.; Nemat‐Nasser, Sia

doi:10.1007/s11340-018-0413-4

Cited by 4 publications

(5 citation statements)

References 33 publications

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“…The EFA was conducted on the pilot survey results, and it was found that the five components can be constructed, including all the success factors. It was important that all the components have eigenvalues greater than 1 [ 4 , 7 ]. Further, it is observed that all the components have a combined variance of greater than 50%.…”

Section: Resultsmentioning

confidence: 99%

“…It is always essential to employ protective coatings on concrete structures to maintain their durability and lifespan. In recent times, polyurea coatings have become an increasingly popular method for preserving concrete buildings from the environment and improving their performance [ 4 ]. Layers of polyurea are put as a liquid and then rapidly cured to form a smooth, waterproof, and highly resistant covering [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…Pure polyurea coatings provide exceptional abrasion and chemical resistance, making them ideal for heavy-duty environments like industrial floors and high-traffic areas [ 5 , 6 ]. Hybrid polyurea coatings, blended with other materials, offer increased flexibility and adhesion, suitable for areas prone to movement [ 4 , 14 ]. Aliphatic polyurea coatings, with UV stability and color retention properties, are perfect for outdoor concrete applications.…”

Section: Introductionmentioning

confidence: 99%

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“…For example, the substrate may possess higher stiffness and strength, while the polyurea exhibits greater toughness and energy absorption. This mismatch can result in interfacial stress concentrations and failures, impacting the overall performance of the material [58][59][60][61]. Insufficient chemical compatibility between the substrate and polyurea can give rise to impedance mismatch as well.…”

Section: Impedance Mismatch Between Base Materials and Polyureamentioning

confidence: 99%

Recent Developments in Polyurea Research for Enhanced Impact Penetration Resistance and Blast Mitigation

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Ding,

Lin

et al. 2024

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Polyurea has gained significant attention in recent years as a functional polymer material, specifically regarding blast and impact protection. The molecular structure of polyurea is characterized by the rapid reaction between isocyanate and the terminal amine component, and forms an elastomeric copolymer that enhances substrate protection against blast impact and fragmentation penetration. At the nanoscale, a phase-separated microstructure emerges, with dispersed hard segment microregions within a continuous matrix of soft segments. This unique microstructure contributes to the remarkable mechanical properties of polyurea. To maximize these properties, it is crucial to analyze the molecular structure and explore methods like formulation optimization and the incorporation of reinforcing materials or fibers. Current research efforts in polyurea applications for protective purposes primarily concentrate on construction, infrastructure, military, transportation and industrial products and facilities. Future research directions should encompass deliberate formulation design and modification, systematic exploration of factors influencing protective performance across various applications and the integration of numerical simulations and experiments to reveal the protective mechanisms of polyurea. This paper provides an extensive literature review that specifically examines the utilization of polyurea for blast and impact protection. It encompasses discussions on material optimization, protective mechanisms and its applications in blast and impact protection.

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“…Note that point-wise inversion of the measured (or calculated) SM using these equations to determine k 1 and z 53 does not provide a unique solution for k 1 . However, this ambiguity may be removed by enforcing the (physically motivated) continuity of k 1 as a function of frequency (similar to the traditional procedure of phase spectral analysis; see for example [46]). The inter-relation of S and T is presented in [40].…”

Section: Transfer Matrix Of Layered Structures For Oblique Sh Wavesmentioning

confidence: 99%

Overall constitutive description of symmetric layered media based on scattering of oblique SH waves

Amirkhizi

Alizadeh

2018

Wave Motion

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This papers investigates the scattering of oblique shear horizontal (SH) waves off finite periodic media made of elastic and viscoelastic layers. It further considers whether a Willis-type constitutive matrix (in temporal and spatial Fourier domain) may reproduce the scattering matrix (SM) of such a system. In answering this question the procedure to determine the relevant overall constitutive parameters for such a medium is presented. To do this, first the general form of the dispersion relation and impedances for oblique SH propagation in such coupled Willis-type media are developed. The band structure and scattering of layered media are calculated using the transfer matrix (TM) method. The dispersion relation may be derived based on the eigen-solutions of an infinite periodic domain. The wave impedances associated with the exterior surfaces of a finite thickness slab are extracted from the scattering of such a system. Based on reciprocity and available symmetries of the structure and each constituent layer, the general form of the dispersion and impedances may be simplified. The overall quantities may be extracted by equating the scattering data from TM with those expected from a Willis-type medium. It becomes evident that a Willis-type coupled constitutive tensor with components that are assumed independent of wave vector is unable to reproduce all oblique scattering data. Therefore, non-unique wave vector dependent formulations are introduced, whose SM matches that of the layered media exactly. It is further shown that the dependence of the overall constitutive tensors of such systems on the wave vector is not removable even at very small frequencies and incidence angles and that analytical considerations significantly limit the potential forms of the spatially

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A New Technique for Characterization of Low Impedance Materials at Acoustic Frequencies

Cited by 4 publications

References 33 publications

Modeling of success factors of using PU coats in concrete construction projects

Modeling of success factors of using PU coats in concrete construction projects

Recent Developments in Polyurea Research for Enhanced Impact Penetration Resistance and Blast Mitigation

Overall constitutive description of symmetric layered media based on scattering of oblique SH waves

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