Resonant ultrasound spectroscopy for investigation of thin surface coatings

Seiner, Hanuš; Růžek, Michal; Sedlák, Petr; Bicanová, Lucie; Landa, Michal

doi:10.2495/mc090231

Cited by 3 publications

(6 citation statements)

References 17 publications

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“…This approach was partially introduced by the current authors in Ref. 17, where, however, only the linearization of the forward problem is briefly sketched (with considerably rougher approximations), but the invertibility of the linearized forward problem is not discussed at all. The main aim of this paper is to give explicit formulas for the linearization of both the direct and inverse problems of RUS for thin surface layers, to prove that these linearizations approximate reliably the full (nonlinear) problems, and to give an experimental example of the application of the linearized theory.…”

Section: Introductionmentioning

confidence: 98%

Linearized forward and inverse problems of the resonant ultrasound spectroscopy for the evaluation of thin surface layers

Růžek

Sedlák

Seiner

et al. 2010

The Journal of the Acoustical Society of America

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In this paper, linearized approximations of both the forward and the inverse problems of resonant ultrasound spectroscopy for the determination of mechanical properties of thin surface layers are presented. The linear relations between the frequency shifts induced by the deposition of the layer and the in-plane elastic coefficients of the layer are derived and inverted, the applicability range of the obtained linear model is discussed by a comparison with nonlinear models and finite element method (FEM), and an algorithm for the estimation of experimental errors in the inversely determined elastic coefficients is described. In the final part of the paper, the linearized inverse procedure is applied to evaluate elastic coefficients of a 310 nm thick diamond-like carbon layer deposited on a silicon substrate.

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Section: Introductionmentioning

confidence: 98%

Linearized forward and inverse problems of the resonant ultrasound spectroscopy for the evaluation of thin surface layers

Růžek

Sedlák

Seiner

et al. 2010

The Journal of the Acoustical Society of America

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show abstract

“…This paper continues and extends the FEM analysis of the elastic strains in the X-interfaces in Cu-Al-Ni single crystals presented by the authors in [4]. a e-mail: hseiner@it.cas.cz 2 The X-Microstructure…”

Section: Introductionmentioning

confidence: 99%

“…As shown by Ruddock [5] for the In-Th alloy and by the authors [4] for Cu-Al-Ni, the Xinterface does not, for the free boundary conditions, minimise the Helmholtz free energy of the crystal…”

Section: Introductionmentioning

confidence: 99%

“…In the Cu-Al-Ni alloy, formation of such interfacial microstructures was recently observed by the authors [2][3][4] during the shape recovery process (thermally induced transition from 2H-martensite into austenite).…”

Section: Introductionmentioning

confidence: 99%

“…The X-interfaces were induced into a single crystal of Cu-Al-Ni (a rectangular, 15mm long prismatic bar with the axial direction close to [001] in austenite and the lateral faces approximately perpendicular to [110] and [110] directions in austenite) by the experimental procedure described in [3,4], i.e. by mechanical stabilisation and subsequent heating.…”

Section: Experimentally Observed X-interfacesmentioning

confidence: 99%

See 2 more Smart Citations

FEM Mo delling of Elastically Strained Interfacial Microstructures in Cu-Al-Ni Single Crystals

Glatz

Seiner

Landa

2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract. In this paper, a construction of FEM models of particular microstructures forming between austenite and mechanically stabilised 2H-martensite of the Cu-Al-Ni shape memory alloy is presented. Since these microstructures appearing during the shape recovery process (the so-called X-interfaces or the Xmicrostructures) are not global minimisers of the free energy, their mesoscopic morphology cannot be determined from any known thermodynamic extremal criterion, but must be taken directly from the experimental observations. For the elastic coefficients of both austenite and martensite phase of this alloy known from the ultrasonic measurements, such model enables determination of elastic strains within the microstructure and, thus, evaluation of the stored elastic energy in the microstructure. The model (implemented in COMSOL Multiphysics FEM environment) is applied to analyse interfacial microstructures observed experimentally in a prismatic bar of a single crystal of the examined alloy, and to find optimal morphology of this microstructure by means of the free energy (local) minimisation.

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Noncontact evaluation of full elastic constants of perovskite MAPbBr3 via Photoacoustic eigen-spectrum analysis in one test

Zhang

Liu

Tao

et al. 2020

Sci Rep

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Elasticity is one basic property of hybrid organic-inorganic perovskites. It highly relates to many fundamental processes in solid physics. The investigation of elasticity is of interest not only to explore the intrinsic properties of a material, but also to improve their potential application performance. In this study, we predict photoacoustic eigen-spectrum (PAES) of single crystal. Then by solving the inverse problem of the generation of PAES, we propose a noncontact method to determine a complete set of elastic constants of single crystal in one test. Experiments confirm the proposed method accurately determines all elastic constants of MAPbBr3. Since this method is totally noncontact and does not require multiple specimens cutting along different crystal axes, it could be more competent for rare, tiny and brittle specimen, or when the specimen is immersed in turbid or opaque medium. Benefitting from these superiorities, the proposed method might be found prominent values in materials science and applications.

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Resonant ultrasound spectroscopy for investigation of thin surface coatings

Cited by 3 publications

References 17 publications

Linearized forward and inverse problems of the resonant ultrasound spectroscopy for the evaluation of thin surface layers

Linearized forward and inverse problems of the resonant ultrasound spectroscopy for the evaluation of thin surface layers

FEM Mo delling of Elastically Strained Interfacial Microstructures in Cu-Al-Ni Single Crystals

Noncontact evaluation of full elastic constants of perovskite MAPbBr3 via Photoacoustic eigen-spectrum analysis in one test

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