Temat: elastic constants - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Nanomechanical properties of metallic fcc nanorods from molecular simulations with the Sutton-Chen force field
Autorzy:: Białoskorski, M.
Rybicki, J.
Tematy:: nanorods
nanomechanical properties
elastic constants
plasticity; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1933985.pdf Link otwiera się w nowym oknie
Opis:: Basic elastic constants (Young’s modulus, Poisson’s ratio, shear modulus) were determined for several monocrystalline, metallic (Ni, Cu, Pt, Au) nanorods using molecular dynamics with the Sutton-Chen force field. Stress-strain curves were also calculated and discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Mechanic, Half-Metallic and Thermoelectric Properties of the PdZrTiAl under pressure: A DFT study
Autorzy:: Parsamehr, S.
Boochani, A.
Sartipi, E.
Amiri, M.
Solaymani, S.
Naderi, S.
Aminian, A.
Tematy:: PdZrTiAl
half-metal
thermoelectric
elastic constants
DFT; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/354036.pdf Link otwiera się w nowym oknie
Opis:: The half-metallic, mechanical, and transport properties of the quaternary Heusler compound of PdZrTiAl is discussed under hydrostatic pressures in the range of –11.4 GPa to 18.4 GPa in the framework of the density functional theory (DFT) and Boltzmann quasi-classical theory using the generalization gradient approximation (GGA). By applying the stress, the band gap in the minor spin increases so that the lowest band is obtained 0.25 eV at the pressure of –11.4 GPa while the maximum gap is calculated 0.9 eV at the pressure of 18.4 GPa. In all positive and negative pressures, the PdZrTiAl composition exhibits a half-metallic behavior 100% spin polarization at the Fermi level. It is also found that applying stress increases the Seebeck coefficient in both spin directions. In the minority spin, the n-type PdZrTiAl, the power factor (PF) for all the cases is greater in the equilibrium state than the strain and stress conditions whereas in the majority spin, the PF value of the stress state is greater than the other two. The non-dimensional figure of merit (ZT) is significant and is about one in spin down in the room temperature for the all pressure states that it remains on this value by applying pressure. The obtained elastic constants indicate that the PdZrTiAl crystalline structure has a mechanical stability. Based on the Yong (E), Bulk (B) and shear (G) modulus and Poisson (n) ratio, the brittle-ductile behavior of this compound has been investigated under pressure. The results indicate that PdZrTiAl has a ductile nature and it is a stiffness compound in which elastic and mechanical instability increases by applying strain.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A method for correction of elastic and piezoelectric constants of crystals using measured surface acoustic wave parameters
Metoda korekcji stałych elastycznych i piezoelektrycznych kryształów z wykorzystaniem zmierzonych parametrów akustycznych fal powierzchniowych
Autorzy:: Brzozowski, E.
Tematy:: stałe elastyczne
stałe piezoelektryczne
stałe dielektryczne
akustyczna fala powierzchniowa
elastic constants
piezoelectric constants
dielectric constants; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
Powiązania:: https://bibliotekanauki.pl/articles/192248.pdf Link otwiera się w nowym oknie
Opis:: Surface acoustic wave (SAW) properties of a crystal depend on the density, elastic, piezoelectric and dielectric constants.On the basis of literature data, calculations of SAW parameters in a neodymium calcium oxoborate [NdCa4O(BO3)3] crystal were carried out to evaluate orientations optimal for the correction of elastic and piezoelectric constants. SAW velocities and electromechanical coupling coefficients were measured using SAW delay lines deposited on differently oriented crystal substrates. Dielectric constants were determined from measured effective permittivities. Both a nonlinear least squares algorithm and a computer program for the correction of elastic and piezoelectric constants from measured SAW velocities and electromechanical coupling coefficients were developed. The correction of NdCa4O(BO3)3 elastic and piezoelectric constants was carried out. It was shown that for the corrected constants the differences between the measured and calculated SAW parameters are marginal.
Własności akustycznych fal powierzchniowych (AFP) w rysztale zależą od gęstości stałych elastycznych, piezoelektrycznych i dielektrycznych. Na podstawie danych z literatury obliczono parametry AFP w krysztale tlenoboranu neodymowo wapniowego [NdCa4O(BO3)3] w celu wyznaczenia orientacji optymalnych do korekcji stałych. Zmierzono prędkości i współczynniki sprzężenia elektromechanicznego AFP z wykorzystaniem linii opóźniających osadzonych na podłożach NdCa4O(BO3)3 o różnych orientacjach. Wyznaczono stałe dielektryczne z pomiaru przenikalności elektrycznych. Opracowano metodę korekcji stałych elastycznych i piezoelektrycznych wykorzystującą nieliniowy algorytm najmniejszych kwadratów i zmierzone parametry AFP. Przeprowadzono korekcję stałych elastycznych i piezoelektrycznych kryształu NdCa4O(BO3)3. Wykazano, że dla stałych skorygowanych różnice między zmierzonymi, a obliczonymi parametrami AFP są bardzo małe.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Hyper-elastic modelling of intervertebral disc polyurethane implant
Autorzy:: Pawlikowski, M.
Skalski, K.
Sowiński, T.
Tematy:: constitutive equation
curve fitting
hyper-elastic constants
równanie konstytutywne
dopasowywanie krzywej; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/306535.pdf Link otwiera się w nowym oknie
Opis:: Artificial materials including various kinds of polymers like polyurethanes are more and more widely used in different branches of science and also in biomedical engineering. The paper presents the process of creating a constitutive equation for a polyurethane nanocomposite which is considered to be hyper-elastic. The constitutive modelling was conducted within the range of application of the material as one of the components of lumbar intervertebral disc prosthesis. In the paper, the biomechanics of the lumbar spine and the most frequently applied intervertebral disc prostheses are described. Also a polyurethane nanocomposite as a new material to be applied in prostheses is presented. The way of formulating a constitutive equation by means of mathematical formulae is described. Four various hyper-elastic potential functions are considered, i.e., Ogden, Neo-Hookean, Yeoh and Mooney–Rivlin. On the basis of monotonic compression tests the best hyper-elastic model for the material considered was chosen and hyper-elastic constants were calibrated. Finally, the constitutive model was validated on the basis of FE analysis. The paper ends with a conclusion and presentation of further plans of research directed towards the development of a constitutive equation and its application in computer simulations by means of the finite element method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Theoretical Calculations for Elastic and Thermodynamic Properties of NbN₂ under High Pressure
Autorzy:: Hou, Bao-Sen
Liu, Ke
Mao, Xiao-Chun
Tan, Jiao
Zhou, Xiao-Lin
Tematy:: high temperature and high pressure
elastic constants
anisotropy
Debye temperature
NbN₂; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1032591.pdf Link otwiera się w nowym oknie
Opis:: The structural and elastic properties of NbN₂ at high pressures were investigated through the first-principles calculation. Results indicate that NbN₂ is a potential hard material. NbN₂ meets mechanical stability criteria and possesses ductility within the pressure of 100 GPa. The elastic anisotropy under high pressure was achieved by the elastic anisotropy factors, which reduce with increasing pressure. Using the quasi-harmonic Debye model, we also investigated the thermodynamic properties of NbN₂.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Structural Properties of Some Alkali Metal Hydrides at High Temperature and Pressure
Autorzy:: Thakre, V.
Singh, S.
Tematy:: hydrides
phase transition
three-body interaction
volume collapse
elastic constants
cohesive energy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1030544.pdf Link otwiera się w nowym oknie
Opis:: In this paper we have developed a realistic interaction potential model to study the high pressure phase transition of ionic alkali-metal compounds KH and NaH, having B₁ structure at room temperature. We have theoretically investigated phase transition pressures and volume collapses of KH and NaH at high temperatures, and found results well suited with available experimental data. The elastic constants and their pressure derivatives are reported first time. The thermodynamical properties of B₁ phase of KH and NaH are also predicted. The inclusion of temperature effect in TBIP makes the present model realistic and suitable for theoretical high-pressure studies.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Determination of elastic moduli of sands from triaxial compression test
Autorzy:: Świdziński, W.
Tematy:: empirical method
determination of elastic constants
elastic moduli
non-cohesive soils
triaxial compression test
sand; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Powiązania:: https://bibliotekanauki.pl/articles/241004.pdf Link otwiera się w nowym oknie
Opis:: In the paper an empirical method of determination of elastic constants of non-cohesive soils on the basis of the experimental data from conventional triaxial com-pression tests, is proposed. The method is based on a new interpretation of triaxial tests during which samples of dry sands are subjected to several cycles of loading and unloading. The test results of all strain and stress components measured in the experiment are presented in terms of deviatoric stress versus deviatoric strain and mean effective pressure versus volumetric strain diagrams. It is assumed that after any stress reversals the material exhibits purely elastic response that obeys Hooke's linear law. Elastic moduli are determined from the first stage of unloading, which is different from the other methods commonly accepted in soil mechanics. The main advantage of the method proposed was isolating linear behaviour of the material that corresponds to elastic response and including in the analysis the lateral deform-ation of a sample. In the paper several examples of test results for various confining pressures and initial void ratios are presented and analysed. Comparison with other methods is made and discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Structural, Mechanical and Thermodynamic Properties Under Pressure Effect of Rubidium Telluride: First Principle Calculations
Autorzy:: Bidai, K.
Ameri, M.
Ameri, I.
Bensaid, D
Slamani, A.
Zaoui, A.
Al-Douri, Y.
Tematy:: Anti-fluorite: Rb2Te; FP-LAPW; GGA
structural properties
thermodynamics properties
elastic constants; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/354182.pdf Link otwiera się w nowym oknie
Opis:: First-principles density functional theory calculations have been performed to investigate the structural, elastic and thermodynamic properties of rubidium telluride in cubic anti-fluorite (anti-CaF₂-type) structure. The calculated ground-state properties of Rb₂Te compound such as equilibrium lattice parameter and bulk moduli are investigated by generalized gradient approximation (GGA-PBE) that are based on the optimization of total energy. The elastic constants, Young’s and shear modulus, Poisson ratio, have also been calculated. Our results are in reasonable agreement with the available theoretical and experimental data. The pressure dependence of elastic constant and thermodynamic quantities under high pressure are also calculated and discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: A method for correction of elastic and piezoelectric constants of crystals using measured surface acoustic wave parameters = Metoda korekcji stałych elastycznych i piezoelektrycznych kryształów z wykorzystaniem zmierzonych parametrów akustycznych fal powierzchniowych
A method for correction of elastic and piezoelectric constants of crystals using measured surface acoustic wave parameters
Materiały Elektroniczne 2011 T.39 nr 2
Autorzy:: Brzozowski Ernest
Wydawca:: ITME
Powiązania:: Materiały Elektroniczne
Electronic Materials
Opis:: 8-13 s. : il. 30 cm.
Bibliogr. s. 13
Dostawca treści:: RCIN - Repozytorium Cyfrowe Instytutów Naukowych

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Skocz do pozycji: 10.

Tytuł:: Group and Phase Velocity of Love Waves Propagating in Elastic Functionally Graded Materials
Autorzy:: Kiełczyński, P.
Szalewski, M.
Balcerzak, A.
Wieja, K.
Tematy:: surface Love waves
group velocity
phase velocity
functionally graded materials
profiles of elastic constants
direct Sturm-Liouville problem; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/177447.pdf Link otwiera się w nowym oknie
Opis:: This paper presents a theoretical study of the propagation behaviour of surface Love waves in nonhomogeneous functionally graded elastic materials, which is a vital problem in acoustics. The elastic properties (shear modulus) of a semi-infinite elastic half-space vary monotonically with the depth (distance from the surface of the material). Two Love wave waveguide structures are analyzed: 1) a nonhomogeneous elastic surface layer deposited on a homogeneous elastic substrate, and 2) a semi-infinite nonhomogeneous elastic half-space. The Direct Sturm-Liouville Problem that describes the propagation of Love waves in nonhomogeneous elastic functionally graded materials is formulated and solved 1) analytically in the case of the step profile, exponential profile and 1cosh2 type profile, and 2) numerically in the case of the power type profiles (i.e. linear and quadratic), by using two numerical methods: i.e. a) Finite Difference Method, and b) Haskell-Thompson Transfer Matrix Method. The dispersion curves of phase and group velocity of surface Love waves in inhomogeneous elastic graded materials are evaluated. The integral formula for the group velocity of Love waves in nonhomogeneous elastic graded materials has been established. The results obtained in this paper can give a deeper insight into the nature of Love waves propagation in elastic nonhomogeneous functionally graded materials.
Dostawca treści:: Biblioteka Nauki

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