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    Wyświetlanie 1-7 z 7
    Tytuł:
    Effects of piezoelectricity on bulk waves in monoclinic poro-elastic materials
    Autorzy:
    Gupta, V.
    Vashishth, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/281774.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    piezoelectricity
    porous
    monoclinic
    Opis:
    Piezoelectric materials are materials which produce electric field when stress is applied and get strained when electric field is applied. Piezoelectric materials are acting as very important functional components in sonar projectors, fluid monitors, pulse generators and surface acoustic wave devices. Wave propagation in porous piezoelectric material having crystal symmetry 2 is studied analytically. The Christoffel equation is derived. The phase velocities of propagation of all these waves are described in terms of complex wave velocities. The effects of phase direction, porosity, wave frequency and piezoelectric interaction on the phase velocities are studied numerically for a particular model.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 571-577
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The partial slip contact problem for a monoclinic coated half plane
    Autorzy:
    Çömez, I.
    Alinia, Y.
    Güler, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/38630043.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    partial slip
    monoclinic materials
    fiber angle
    stick/slip transition
    Opis:
    In this study, the partial slip contact problem for a monoclinic coated half plane indented by a rigid cylindrical punch is considered. The main objective of current study is to illustrate the effects of material anisotropy on the surface stresses, the contact width and the stick/slip region of the partial slip contact. Using the Fourier integral transform and boundary conditions of the problem, the singular integral equation of the system is obtained. Numerical results of the problem are provided for typical fibrous composites applying the Gauss-Chebyshev discretization method. Sensitivity analysis of the surface stresses is performed for both the material and geometric parameters. The results indicate that the coating fiber angle can significantly alter the distribution of contact tractions. As the fiber angle ranges from θ = 0° to θ = 90°, the contact half-length increases up to 20% whereas the stick zone half-length varies significantly.
    Źródło:
    Archives of Mechanics; 2022, 74, 1; 13-37
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of food-grade guar gum on flotation separation of chalcopyrite and monoclinic pyrrhotite in low-alkali systems
    Autorzy:
    Chen, Xiong
    Gu, Guohua
    Li, Lijuan
    Chen, Zhixiang
    Powiązania:
    https://bibliotekanauki.pl/articles/110629.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    food-grade guar gum
    chalcopyrite
    monoclinic pyrrhotite
    flotation depressant
    Opis:
    The flotation separation of chalcopyrite from monoclinic pyrrhotite using food-grade guar gum (FGG) as a depressant was studied through micro flotation and flotation kinetics experiments, zeta potential, adsorption measurements and scanning electron microscope (SEM) analysis as well as infrared spectroscopy analysis. The flotation tests showed that the reagent scheme of depressant FGG 40 mg/dm3, collector PAX (potassium amyl xanthate) 10 mg/dm3 and frother MIBC (Methyl isobutyl carbinol) 10 mg/dm3 at pH 8.0 could achieve selective flotation separation of chalcopyrite from monoclinic pyrrhotite (a concentrate with Cu grade of 22.35% and recovery of 82.52% was achieved from the mixed minerals flotation), which indicated that FGG exhibited a selective depression effect on monoclinic pyrrhotite The kinetics, zeta potential, adsorption, SEM and infrared studies revealed that the depressant FGG could absorb more strongly on the surface of monoclinic pyrrhotite than chalcopyrite. Additionally, the results revealed that the interaction of FGG with the monoclinic pyrrhotite surface was governed primarily by strong chemisorption, whereas FGG mainly bonded to chalcopyrite through hydrogen bonding bonding. This property was the reason why FGG had excellent depression selectivity toward monoclinic pyrrhotite and weak depression effect on chalcopyrite flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 2; 437-447
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of ultrasonic mechanoactivation on phase formation in dielectric ceramic material based on BaAl2Si2O8
    Autorzy:
    Bliznyuk, L.
    Petrochenko, T.
    Fedotova, V.
    Rubanik, V.
    Shilin, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/118378.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    monoclinic modification
    hexagonal modification
    mechanoactivation
    modyfikacja jednoskośna
    modyfikacja sześciokątna
    mechanoaktywacja
    Opis:
    Mechanoactivation effect has been studied on crystal structure of BaAl2Si2O8 known as polymorphous compound. Ultrasonic treatment of the synthesized material powder has been used as mechanoactivation method. Ultrasonic grinding during 0.5–1.5 h was determined to result in polymorphous transformation. Dielectric properties of ceramics BaAl2Si2O8 have been investigated for hexagonal, monoclinic modifications of crystal structure as well for that based on phase mixture. It is shown that sintering of ceramic material based on monoclinic crystal structure modification of BaAl2Si2O8 takes place in temperature diapason of 1300– 1350ºС. Ceramic materials based on BaAl2Si2O8 compounds have been shown to exhibit low porosity, high Q-factor and dielectric parameters allowing use them for resonators, and other microwave devices.
    Źródło:
    Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej; 2014, 6; 61-67
    1897-7421
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Propagation of SH waves in an regular non homogeneous monoclinic crustal layer lying over a non-homogeneous semi-infinite medium
    Autorzy:
    Sethi, M.
    Sharma, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/265788.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    równania różniczkowe
    prędkość fali sprężystej
    sejsmologia
    SH waves
    monoclinic
    non homogeneity
    differential equations
    Opis:
    The present paper discusses the dispersion equation for SH waves in a non-homogeneous monoclinic layer over a semi infinite isotropic medium. The wave velocity equation has been obtained. In the isotropic case, when non-homogeneity is absent, the dispersion equation reduces to the standard SH wave equation. The dispersion curves are depicted by means of graphs for different values of non-homogeneity parameters for the layer and semi-infinite medium.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 447-459
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uniformity of electroelastic field within a three-phase anisotropic piezoelectric elliptical inhomogeneity in anti-plane shear
    Autorzy:
    Wang, X.
    Schiavone, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/38694715.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    three-phase elliptical inhomogeneity
    confocal ellipses
    monoclinic piezoelectric material
    transversely isotropic piezoelectric material
    Stroh quartic formalism
    real-form solution
    Opis:
    Using the Stroh quartic formalism, we prove that the internal electroelastic field is unconditionally uniform inside a three-phase anisotropic piezoelectric elliptical inhomogeneity with two confocal elliptical interfaces when the surrounding matrix is subjected to uniform remote anti-plane mechanical and in-plane electrical loading. The inhomogeneity and the matrix comprise monoclinic piezoelectric materials with symmetry plane at x3 = 0 and with poling in the x3-direction; the intermediate interphase layer is a transversely isotropic piezoelectric material with poling in the x3-direction. Moreover, we obtain the internal uniform electroelastic field inside the elliptical inhomogeneity and the non-uniform electroelastic field in the interphase layer in real-form in terms of the fundamental piezoelectricity matrices for both the inhomogeneity and the matrix and the generalized Barnett–Lothe tensors for both the interphase layer and the matrix.
    Źródło:
    Archives of Mechanics; 2022, 74, 2-3; 143-156
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response of corrugated interface on incident qSV-wave in monoclinic elastic half-spaces
    Autorzy:
    Singh, S. S.
    Lalvohbika, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/264383.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    współczynnik odbicia
    współczynnik transmisji
    prędkość fazowa
    qSV and qP-waves
    reflection and transmission coefficients
    monoclinic medium
    corrugated interface
    phase velocity
    Opis:
    This paper is concerned with the problem of reflection and transmission of elastic waves due to an incident plane qSV-wave at a corrugated interface between two dissimilar monoclinic elastic half-spaces. Due to the corrugated nature of the interface, there exist regularly and irregularly reflected and transmitted elastic waves. Using Rayleigh’s method of approximation, the reflection and transmission coefficients of regular and irregular waves are obtained for the first order of approximation. We have found that these coefficients are functions of the angle of incidence, elastic constants, corrugation and the frequency parameter. These coefficients are obtained for a special type of interface, z =dcos py. We have computed these coefficients for a particular model and discussed the effects of corrugation and frequency parameter.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 727-750
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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