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Wyświetlanie 1-15 z 59
Tytuł:
Kierunkowość magneto-mechaniczna w stalach krzemowych – teoria i przykłady
Autorzy:
Żurek, Zbigniew Hilary
Dobmann, Gerd
Chmiela, Bartosz
Powiązania:
https://bibliotekanauki.pl/articles/31804009.pdf
Data publikacji:
2023
Wydawca:
Wydawnictwo Druk-Art
Tematy:
procesy produkcyjne i montażowe
blachy izotropowe
podatność magnetyczna
analiza naprężeń
impedancja
production processes
assembly processes
isotropic sheets
magnetic susceptibility
stress analysis
impedance
Opis:
Powszechnie stosowane blachy elektrotechniczne stali krzemowej [15, 16] są zorientowane na ziarno (GO – np. blachy transformatorów anizotropowych) lub niezorientowane na ziarno (NGO – np. blachy izotropowe lub generatorowe). Badaniu poddano blachę typu M130 o wymiarach odpowiadających formatowi A4. Oceniano dwa przypadki zmiany naprężenia w stosunku do geometrycznego środka arkusza blachy jak i wąskiego paska zwijanego w okrąg. Wprowadzono założenie, że poza zakresem odkształceń plastycznych w blasze pozostaje naprężenie szczątkowe w procesie produkcji i montażu np. transformatorów czy maszyn. Wskazano, że istnieje jakościowa zależność między wynikami pomiarów a przewidywaniami analitycznymi. Podjęto próby ilościowej analizy naprężenia na drodze symulacji i pomiaru. Badano związek stanu naprężenia ze zmianami parametrów podatności magnetycznej na stan odkształceń czy deformacji (efekt magnetosprężysty Villariego).
Źródło:
Napędy i Sterowanie; 2023, 25, 6; 30-33
1507-7764
Pojawia się w:
Napędy i Sterowanie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On spatial vs referential isotropic fourier’s law in finite deformation thermomechanics
Autorzy:
Wcisło, Balbina
Pamin, Jerzy
Rose, Lars
Menzel, Andreas
Powiązania:
https://bibliotekanauki.pl/articles/38890076.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
heat conduction
isotropic Fourier’s law
large strains
thermomechanical coupling
Opis:
This paper deals with the issue of isotropic heat conduction in thermomechanical largestrain problems. The aim of the paper is a comparison of different variants of Fourier’s law used in the literature for a large strain problem. In particular, Fourier’s law is specified either in the reference or in the deformed configuration by using different options of heat flux density vectors which are presented and discussed. The paper includes working examples to illustrate the presented theory. Moreover, different formulations of Fourier’s law are tested by using the finite element method to investigate the influence of the applied variant on simulation results. The analysis reveals that in a strongly deformed area the temperature distribution varies.
Źródło:
Engineering Transactions; 2023, 71, 1; 111-140
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A nonlinear statistical empirical model for transversely isotropic rocks under uniaxial compression condition
Autorzy:
Deng, Yansheng
Shen, Chenjie
Zou, Baoping
Powiązania:
https://bibliotekanauki.pl/articles/2173991.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
skała izotropowa poprzecznie
uszkodzenie statyczne
kompresja jednoosiowa
transversely isotropic rock
statics damage
uniaxial compression
Opis:
The mechanical characteristics of transversely isotropic rocks are significantly different under various levels of inclination, and it is difficult to describe exactly the mechanical behaviour of transversely isotropic rocks. Assuming that rock consists of a great deal of microelements, and the microelement strength controlled by Mohr-Coulomb criterion follows the log normal distribution. The elastic modulus is used to reflect the anisotropy of rock, and the weak patches stiffness model is verified and employed to depict the variation of elastic modulus with different inclination angle. Based on basic damage mechanics theory and statistical method, a nonlinear statistical empirical model for transversely isotropic rocks is proposed under uniaxial compressive condition. In order to verify the correctness of the proposed model, comparison analyses between predicted results and experimental data taken from published literature are carried out, which have good consistency. Finally, the discussions on the influences of the distribution parameters α, c and elastic modulus with different inclination angle, Eθ, on proposed model is offered.
Źródło:
Archives of Civil Engineering; 2022, 68, 3; 37--47
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applications of implicit constitutive theory for describing the elastic response of rocks and concrete
Autorzy:
Bustamante, R.
Rajagopal, K. R.
Powiązania:
https://bibliotekanauki.pl/articles/38695703.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
nonlinear elasticity
small strain
isotropic solids
Opis:
An implicit constitutive relation is proposed for elastic bodies, when the gradient of the displacement is assumed to be very small, and as a result the strains are small. The resulting constitutive relation is a non-linear relationship between the linearized strain and the stress. The model is used to fit data for rock and concrete. Some boundary value problems are studied within the context of homogeneous deformations, and also a problem with inhomogeneous deformations is analyzed, namely the inflation of a circular annulus. The predictions of this new implicit constitutive relation are compared with the predictions of the constitutive equations for linearized elastic bodies.
Źródło:
Archives of Mechanics; 2022, 74, 6; 513-547
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized plane waves in a rotating thermoelastic double porous solid
Autorzy:
Pathania, Vijayata
Kumar, Rajesh
Gupta, Vipin
Barak, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/27312403.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
rotacja
fala płaska
termosprężystość
voids of type-I
voids of type-II
rotation
plane waves
homogeneous isotropic
generalized thermoelasticity
Opis:
The propagation of plane waves in a rotating homogeneous, isotropic, thermoelastic solid with double porosity following Lord-Shulman’s theory of thermoelasticity has been investigated. It is assumed that the medium rotates about an axis normal to the surface with a uniform angular velocity. There may exist five coupled waves that evolved due to the longitudinal, transverse disturbance, voids of type-I and type-II, and temperature change in the medium. The secular equation for the model under consideration has been derived with the help of formal solutions and boundary conditions. The amplitude of displacements, temperature change and volume fraction fields for voids of type-I and type-II have also been computed analytically. Finally, numerical computations have been carried out for magnesium crystal material to understand the behavior of amplitude of phase velocity, penetration depth, specific loss, displacement components, temperature change, and volume fraction field due to type-I and type-II voids corresponding to the different rotation rates. Various graphs have been plotted to support the analytical findings. The study may be used in the development of rotation sensors, material design and thermal efficiency.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 4; 138--154
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of probabilistic aspects reliability of isotropic bodies with internal defects
Autorzy:
Kvit, Roman
Powiązania:
https://bibliotekanauki.pl/articles/2202039.pdf
Data publikacji:
2022
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
fracture
reliability
distribution law
axisymmetric loading
disc-shaped crack
isotropic material
pękanie
niezawodność
obciążenie osiowosymetryczne
materiał izotropowy
Opis:
A study of the stress state and reliability of an isotropic body with the same material crack resistance and evenly distributed internal defects-cracks under the conditions of homogeneous axisymmetric loading is carried out. Defects are characterized by two independent random variables – a radius and orientation angle. The probability density distribution of the defect radius is chosen in the form of an exponential law. The probability density distribution of the defect orientation angle is chosen in the form of a law that corresponds to the material isotropy. The influence of the loading level, type of stress state and body size (number of defects) on the most probable value, the mean value and the dispersion of failure loading (strength) are investigated.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2022, 21, 3; 73--84
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
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:
Simulation of thermomechanical processes in disc brakes of wheeled vehicles
Autorzy:
Hrevtsev, O.
Selivanova, N.
Popovych, P.
Poberezhny, L.
Sakhno, V.
Shevchuk, O.
Poberezhna, L.
Murovanyi, I.
Hrytsanchuk, A.
Romanyshyn, O.
Powiązania:
https://bibliotekanauki.pl/articles/1818803.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
disc brake
wheeled vehicle
angular velocity
thermodynamically reversible process
centrifugal force
time of relaxation
isotropic elastic medium
torsional moment
hamulec tarczowy
pojazd kołowy
prędkość kątowa
siła odśrodkowa
izotropowy ośrodek sprężysty
moment skręcający
Opis:
Purpose: Ensuring the required operational reliability of disc brakes by forecasting their technical condition taking into account thermomechanical processes. Design/methodology/approach: Differential equations of rotation of a rigid body around a fixed axis are solved, it is established that the equations of motion and the equations of thermal conductivity are indirectly related. The use of these analytical dependences provides a better understanding of thermomechanical transients. Findings: The solution is obtained on the basis of the differential equation of thermal conductivity of the hyperbolic type, which does not allow an infinite velocity of propagation of temperature perturbations in contrast to the differential equation of thermal conductivity of the parabolic Fourier type. The obtained analytical dependences provide a better understanding of thermomechanical transients and develop a theoretical basis for determining stresses and heat fluxes in solving problems of reliability and durability of disc brakes. Research limitations/implications: The work uses generally accepted assumptions and limitations for thermomechanical calculations. Practical implications: It is shown, that transients in a mechanical system - a brake disk at impulse loadings cause emergence of thermal effects which arise under the influence of external loadings. Originality/value: The application of these analytical dependences provides a better understanding of thermomechanical transients and develops a theoretical basis for solving problems of reliability and durability of disc brakes.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2021, 104, 1; 11--20
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static bending of isotropic circular cylindrical shells based on the higher order shear deformation theory of Reddy and Liu
Autorzy:
Nwoji, C. U.
Ani, D. G.
Oguaghamba, O. A.
Ibeabuchi, V. T.
Powiązania:
https://bibliotekanauki.pl/articles/2106454.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ścinanie poprzeczne
powłoka Kirchhoffa-Love'a
zginanie
isotropic circular cylindrical shell
shear deformation theory
transverse shear
principle of virtual works
Kirchhoff-Love theory
Opis:
In this paper, a displacement based shear deformation theory formulated on the cubic in-plane displacement field equation of Reddy and Liu is presented for the static bending analysis of isotropic circular cylindrical shells. The adopted displacement field accounts for a quadratic (parabolic) distribution of the transverse shear through the shell thickness as well as satisfies the need for a stress free upper and lower boundary surfaces of the shell. The equations of static equilibrium are obtained on application of the principle of virtual work. Numerical results of the bending analysis for the displacements and stresses are presented for the simply supported shell. A comparison made to those of the Kirchhoff-Love theory for varying shell length to mean – radius of curvature ratios, shows good agreement for thin shells irrespective of the shell length to radius of curvature ratio [...]. The transverse sharing effect is found to be noticeable in the deformation of thick shells, however, this effect diminishes with a continuous increase in [...] ratios.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 141--162
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Moving semi-infinite mode-III crack inside the semi-infinite elastic media
Autorzy:
Mandal, Palas
Powiązania:
https://bibliotekanauki.pl/articles/2055034.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
semi-infinite crack
isotropic media
Rayleigh wave
SH-wavestress intensity
factor
crack opening displacement
Opis:
The problem of a semi-infinite moving mode-III crack inside a semi-infinite isotropic half- -space is considered. The crack is located between a semi-infinite elastic medium and a layer whose distance from the surface to crack depth is h. Initially, Fourier transformation and inverse Fourier transformation are applied to transfer the governing boundary value problem to the well-known Wiener-Hopf equation. The purpose of this problem is to obtain the analytical solution of Stress Intensity Factor (SIF) and Crack Opening Displacement (COD) at the neighbourhood of the crack tip. In numerical Section, I have discussed the variation of parameters (crack velocity, layer distance h from the surface to crack depth) to show the effect of these parametric values on the graphs of SIF and COD where the material properties (density, shear modulus) were fixed.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 649--659
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimized null steering in compact bowtie antenna array using simulation driven Taguchi method
Autorzy:
Kaur, Baljinder
Marwaha, Anupma
Powiązania:
https://bibliotekanauki.pl/articles/221471.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
interference suppression
non-isotropic antenna array
mutual coupling
simulation-controlled
optimization
Taguchi method
Opis:
Ever rising increase in number of wireless services has prompted the use of spatial multiplexing through null steering. Various algorithms provide electronic control of antenna array pattern. Simulation-driven technique further introduces correction in array factor to account for array geometry. Taguchi method is used here to combat interference in practical antenna arrays of non-isotropic elements, by incorporating the effect of antenna element pattern on array pattern control in the optimization algorithm. 4-element rectangular and bowtie patch antenna arrays are considered to validate the effectiveness of Taguchi optimization. The difference in the computed excitations and accuracy of null steering confirms the dependence of beam pattern on element factor and hence eliminates the need for extra computations performed by conventional algorithms based on array factor correction. Taguchi method employs an orthogonal array and converges rapidly to the desired radiation pattern in 25 iterations, thus signifying it to be computationally cost-effective. A higher gain and a significant reduction in side lobe level (SLL) was obtained for the bowtie array. Further, due to feed along parallel edges of the patch, the radiating edges being slanted to form the bow shape results in a significant reduction in the area as compared with the rectangular patch designed to resonate at the same frequency.
Źródło:
Metrology and Measurement Systems; 2020, 27, 1; 3-17
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of Chaboche model in uniaxial ratcheting simulations
Autorzy:
Wójcik, Marta
Skrzat, A.
Powiązania:
https://bibliotekanauki.pl/articles/175730.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cyclic plasticity
ratcheting
Chaboche model
nonlinear kinematic hardening
isotropic hardening
Opis:
This article presents the application of Chaboche nonlinear kinematic hardening model in simulations of uniaxial ratcheting. First, the symmetrical strain-controlled cyclic tension/compression tests for PA6 aluminum samples were done. Using the experimental stress–strain curve, initial material hardening parameters were determined by the ABAQUS software. The experimental curve was compared with the numerical one. For better fitting of both curves, the optimization procedure based on the least-square method was applied. Using the determined hardening parameters, numerical simulations of the ratcheting were done by the finite element analysis software. Numerical results were then compared with the experimental data obtained in the stress-controlled cyclic loading test.
Źródło:
Advances in Manufacturing Science and Technology; 2020, 44, 2; 57-61
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composite materials for warship constructions
Autorzy:
Kyzioł, Lesław
Powiązania:
https://bibliotekanauki.pl/articles/245851.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
polyester-glass composites
recyclate
modified wood
non-magnetic warships isotropic
Opis:
The article presents the basic properties of composite materials used for the construction of special ships. Static and dynamic characteristics of materials such as wood and polyester-glass composites are presented. Noteworthy are materials such as surface modified wood and polyester-glass composites with the addition of recyclate. Composite materials are widely used materials for the construction of non-magnetic warships. The article describes the properties of surface modified wood with polymethyl methacrylate and a polyester-glass composite with the addition of recyclate. The recyclate is fragmented, milled polyester-glass scrap. The content of the recyclate greatly affects the mechanical properties of the composite. The properties of the composite with the addition of recyclate depend on the recyclate content as well as the production technology and size of the recycled granulates. The test results showed that the increase in the recycled content causes a decrease in the mechanical properties of the composite. However, it should be remembered that these materials originated from waste, waste that is not subject to self-degradation, which have a very negative impact on the natural environment. At present, where there is a very large pollution of the natural environment, the processing and management of huge amounts of composite waste is an essential goal. A significant amount of recyclate significantly reduces the mechanical properties of the composite; however, the same large amount of recycled material has been transformed and used. The manufactured material and its structural elements are still non-magnetic structures and can be used on a less loaded element. The choice of material for the construction of special ships elements is determined not only by its properties but also by knowledge, experience, method of processing, economic and technical risk.
Źródło:
Journal of KONES; 2019, 26, 4; 135-140
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of waves generated in transversely isotropic micropolar generalized thermoelastic half space under temperature dependent properties
Autorzy:
Gupta, R. R.
Powiązania:
https://bibliotekanauki.pl/articles/264335.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
propagacja fal
termoelastyczność
naprężenia
micropolar
transversely isotropic
generalized thermoelastic
amplitude ratios
Opis:
The present study deals with the propagation of waves in a transversely isotropic micropolar generalized thermoelastic material possessing temperature dependent elastic properties. After developing the solution for LS, GL and CT theory, the phase velocities and attenuation quality factor have been obtained. The expressions for amplitudes of stresses, displacements, microratation and temperature distribution have been derived and computed numerically. The numerically evaluated results have been plotted graphically. Some particular cases of interest have also been obtained.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 53-65
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plastic microstress for a defect energy dependent on Burgers tensor
Autorzy:
Borokinni, Adebowale S.
Powiązania:
https://bibliotekanauki.pl/articles/281371.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Burgers tensor
codirectionality hypothesis
strain-gradient plasticity
isotropic body
polycrystalline solid
Opis:
This work presents an extended form of the Aifantis strain-gradient plasticity theory through dependence of the plastic free energy on the Burgers tensor. The constraints of codirectionality for the deviatoric stress and irrotationality of the plastic distortion are assumed. These provide the basis for expressing the work done by the microstress conjugate to the Burgers tensor as the sum of the work done by the microscopic hyperstress vector and scalar. The principle of virtual power is used to establish the microforce balance, which provides the relationship between the resolved shears, plastic microstress and the microscopic hyperstresses. The microforce balance, when augmented with relevant constitutive relations that are consistent with the free-energy imbalance, results in a non-local flow rule depicted as a nonlinear second order partial differential equation in terms of the accumulated plastic strain with concomitant boundary conditions. It is shown in this work that the plastic microstress is purely dissipative and cannot account for backstress whenever the defect energy is dependent on the Burgers tensor.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 343-351
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 59

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