Determination of density and elastic constants of a thin phosphoric acid-anodized oxide film by acoustic microscopy

Zinin, Pavel V.; Lefeuvre, O.; Briggs, Andrew; Zeller, B. D.; Cawley, P.; Kinloch, A. J.; Zhou, Xiaorong; Thompson, G.E.

doi:10.1121/1.428087

Cited by 25 publications

(14 citation statements)

References 14 publications

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“…Li/Mechanics of Materials (2018) 1-35 of energy changes. The crack propagation speed C c is calculated as 0.71C R , in good agreement with the theoretical prediction of 0.73C R (Yoffe, 1951), where the Rayleigh-wave speed C R is approximated by (Zinin et al, 1999) 0.72-( / L ) 2 0.75-( / L ) 2 .…”

Section: Accepted Manuscriptsupporting

confidence: 80%

Ballistic response of hexagonal boron nitride monolayer under impact of a nano-projectile

Tian

Zhang

2019

Mechanics of Materials

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Highlights A finite element model is developed for h-BN monolayer target, where the B-N bonds are represented by Timoshenko beam elements  The elastic properties and bond strength of h-BN monolayer and graphene are verified by nano-indentation simulations  The ballistic response of h-BN monolayer is dependent of the impact speed of the projectile  The stress and deformation wave propagations in the h-BN monolayer interact with the movement of projectile and the material bond failure  h-BN material has potential to increase the ballistic performance significantly for armor application Abstract: The response of a hexagonal boron nitride (h-BN) monolayer subjected to ballistic impact is studied using an explicit finite element (FE) model based on molecular structural mechanics where B-N bonds are represented by the nonlinear Timoshenko beam (B31) elements. The elastic properties and bond strength of h-BN monolayer and graphene are verified by nano-indentation using FE and molecular dynamics (MD) simulations. It shows that the ballistic response of h-BN monolayer is dependent of the impact speed of the projectile. The stress and deformation wave propagations in the h-BN monolayer interact with the movement of projectile and the material bond failure, which, in turn, influence the ballistic performance of the h-BN monolayer target. It shows that h-BN material, in comparison with conventional armor materials, has potential to increase the ballistic performance significantly if it could be practically made for armor application.

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Section: Accepted Manuscriptsupporting

confidence: 80%

Ballistic response of hexagonal boron nitride monolayer under impact of a nano-projectile

Tian

Zhang

2019

Mechanics of Materials

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“…Among the most popular canonical nanostructured materials, anodized-based tubular alumina nanoporous structures have received a great deal of attention [17][18][19][20]. For anodized alumina films having a thickness of several micrometers, classical MHz transducer-based acoustic experiments are traditionally performed for the evaluation of the elastic properties [21][22][23]. However, for the evaluation of films with submicrometer thickness, either higher acoustic frequencies or near-field mechanical probing is required.…”

Section: Introductionmentioning

confidence: 99%

Confined coherent acoustic modes in a tubular nanoporous alumina film probed by picosecond acoustics methods

2012

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Coherent GHz acoustic phonon dynamics in a tubular nanoporous alumina film is studied with picosecond acoustic methods. This study has allowed the determination of the out-of-plane sound velocity and the effective optical index through a time-resolved Brillouin analysis. Several acoustic eigenmodes of the tubular nanoporous alumina film were detected. These GHz eigenmodes exhibit unusual frequency-dependent long lifetimes. Their strong confinement has been explained by the presence of a thin alumina layer at the film/substrate interface which plays the role of an acoustic mirror. Finally, we show that the optical detection process of these long-living eigenmodes can be either enhanced or reduced to zero following a selection rule. In particular, we demonstrate that detection configurations exist where the coherent acoustic phonon and probe light sensitivity functions are orthogonal, leading to cancellation of the photoelastic light scattering mechanism. This has never been reported so far in the physics of the interaction of coherent acoustic phonons with light.

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“…This second type of behavior of the dispersion relation has been called the splitting type. The non-splitting type of behaviour has been observed experimentally in an alumina film on aluminium by acoustic microscopy [16], in doped Cr coatings deposited on high speed steel [17], in a titanium film on steel by SBS [18], in diamond-like-films (DCL) [19]. Splitting type of behavior has been observed recently for Si 3 N 4 films on GaAs [9].…”

Section: Resultsmentioning

confidence: 94%

<title>Elastic properties of cBN films by surface Brillouin scattering</title>

Zinin

Manghnani

Zhang

et al. 2002

Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems

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Surface Brillouin scattering (SBS) has been used to determine the elastic properties of thin hard submicron films cBN deposited on silicon. In case of cBN films, only the Rayleigh mode can be clearly identified in the Brillouin spectra. The elastic properties of the films have been determined by fitting experimental data to theoretical dispersion curves. A Green's function method was used to predict Brillouin scattering spectra of the acoustic excitation at the free surface. Our results demonstrate that the effect of thin hBN interlayer located between cBN film and Si substrate on the velocity of surface acoustic wave (SAW) does not exceed 2% for thin (16 nm film) and is negligible for cBN films thicker than 100 nm. The elastic properties of the cBN films are not softer than those of bulk cBN.

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Determination of density and elastic constants of a thin phosphoric acid-anodized oxide film by acoustic microscopy

Cited by 25 publications

References 14 publications

Ballistic response of hexagonal boron nitride monolayer under impact of a nano-projectile

Ballistic response of hexagonal boron nitride monolayer under impact of a nano-projectile

Confined coherent acoustic modes in a tubular nanoporous alumina film probed by picosecond acoustics methods

<title>Elastic properties of cBN films by surface Brillouin scattering</title>

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