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Wyświetlanie 1-15 z 36
Tytuł:
Free vibration analysis of FGM stepped nanostructures using nonlocal dynamic stiffness model
Autorzy:
Lien, Tran Van
Duc, Ngo Trong
Dinh, Tran Binh
Dat, Pham Tuan
Powiązania:
https://bibliotekanauki.pl/articles/2086972.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nonlocal
DSM
FGM
nanostructure
nondimensional frequency
Opis:
A nonlocal Dynamic Stiffness Model (DSM) for free vibration analysis of Functionally Graded Material (FGM) stepped nanostructures based on the Nonlocal Elastic Theory (NET) is proposed. An exact solution to the equation of motion of a nanobeam element according to the Timoshenko beam theory, NET, and taking into account position of the neutral axis is constructed. Nondimensional frequencies and mode shapes of complete FGM stepped nanostructures are easily obtained using the nonlocal DSM. Numerical results are presented to show significance of the material distribution profile, nonlocal effect, and boundary conditions on free vibration of nanostructures.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 2; 279--292
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical and numerical free vibration analysis of porous functionally graded materials (FGPMs) sandwich plate using Rayleigh-Ritz method
Autorzy:
Njim, E.K.
Bakhy, S.H.
Al-Waily, M.
Powiązania:
https://bibliotekanauki.pl/articles/2175769.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
FGM sandwich plate
porosity parameter
CPT
free vibration
FEA
płyta warstwowa FGM
parametr porowatości
drgania swobodne
Opis:
Purpose: This study introduces a new approximated analytical solution of the free vibration analysis to evaluate the natural frequencies of functionally graded rectangular sandwich plates with porosities. Design/methodology/approach: The kinematic relations are developed based on the classical plate theory (CPT), and the governing differential equation is derived by employing the Rayleigh-Ritz approximate method. The FGM plate is assumed made of an isotropic material that has an even distribution of porosities. The materials properties varying smoothly in the thickness direction only according to the power-law scheme. Findings: The influences of changing the gradient index, porosity distribution, boundary conditions, and geometrical properties on the free vibration characteristics of functionally graded sandwich plates are analysed. Research limitations/implications: A detailed numerical investigation is carried out using the finite element method with the help of ANSYS 2020 R2 software to validate the results of the proposed analytical solution. Originality/value: The results with different boundary conditions show the influence of porosity distribution on the free vibration characteristics of FG sandwich plates. The results indicated a good agreement between the approximated method such as the Rayleigh-Ritz and the finite element method with an error percentage of no more than 5%.
Źródło:
Archives of Materials Science and Engineering; 2021, 110, 1; 27--41
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bending, buckling and free vibration of a beam with unsymmetrically varying mechanical properties
Autorzy:
Magnucki, K.
Lewiński, J.
Magnucka-Blandzi, E.
Kędzia, P.
Powiązania:
https://bibliotekanauki.pl/articles/279585.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
FGM beam
mathematical modelling
numerical FEM calculations
Opis:
The subject of the paper is a beam with unsymmetrically varying mechanical properties in the depth direction. The nonlinear hypothesis of plane cross section deformation is assumed. Based on Hamilton’s principle, two differential equations of motion are obtained. The system of equations is analytically solved with a view to analyse the bending, buckling and free vibration problems of the beam. Moreover, the FEM model of the beam is developed and deflections, critical axial forces and natural frequencies of the beam are calculated. The results of these two methods are compared.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1163-1178
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On axisymmetric heat conduction problem for multilayer graded coated half-space
Autorzy:
Perkowski, D. M.
Kulchytsky-Zhyhailo, R.
Kołodziejczyk, W.
Powiązania:
https://bibliotekanauki.pl/articles/281629.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
temperature
heat flux
FGM
composite
homogenized model
Opis:
The technique of integral Hankel transform to find the solution of heat conduction in half-space coated by a multilayered package of homogenous laminae is applied. The half-space is heated by the given heat flux on the boundary surface. The temperature and heat flux distribution in the radial direction is analyzed for two types of coatings: 1) when the heat conductivity coefficient is described by a power or exponential function of the distance to the boundary surface; 2) multilayered coating has a periodic structure.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 147-156
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the fibres shape effect on the temperature field in the two-phase hollow cylinder
Autorzy:
Ostrowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/362631.pdf
Data publikacji:
2010
Wydawca:
Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:
przewodzenie ciepła
FGM
kompozyt
heat conduction
composite
Opis:
The unidirectional stationary heat conduction in two-phase hollow cylinder is considered. The conductor is made of two-phase stratified composites and has, in special cases, asmooth gradation of effective properties in the radial direction. Therefore, we deal here with a special case of functionally graded materials, FGM (cf. [6]). The formulation of mathematical model of the conductor is based on the tolerance averaging approach (TAA), cf. [8]. Application to the stationary heat conduction and a comparison of tolerance model with asymptotic model (cf. [7]) will be shown. The effect of fibres shape and width on the temperature field will be examined.
Źródło:
Fizyka Budowli w Teorii i Praktyce; 2010, T. 5, nr 3, 3; 45-48
1734-4891
Pojawia się w:
Fizyka Budowli w Teorii i Praktyce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nieliniowe zagadnienie stacjonarnego przepływu ciepła w dwuskładnikowym przewodniku cylindrycznym
On the non-linear stationary heat conduction in two-phase hollow cylinder
Autorzy:
Ostrowski, P
Powiązania:
https://bibliotekanauki.pl/articles/362637.pdf
Data publikacji:
2011
Wydawca:
Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:
przepływ ciepła
FGM
kompozyt
heat conduction
composite
Opis:
Celem pracy jest analiza nieliniowego stacjonarnego i jednokierunkowego przepływu ciepła w przewodniku cylindrycznym o funkcyjnie zmiennych własnościach efektywnych. Rozważany przewodnik na poziomie mikro składa się z dwufazowych komórek (pierścieni) o stałej szerokości, który przy dostatecznie dużej liczbie komórek można traktować jako materiał o funkcyjnej gradacji własności, FGM (por. [6]). Na brzegi przewodnika została narzucona stała po obwodzie temperatura, a współczynnik przewodzenia ciepła poszczególnych składników zamodelowano wielomianem pierwszego stopnia. Analizie poddano wpływ nieliniowości i rozkładu poszczególnych składników kompozytu na przebieg pola temperatury.
The main aim is to consider non-linear stationary and unidirectional heat conduction in a hollow cylinder with functionally graded effective material properties. The conductor is made of two-phase stratified cells (annuli) with constant width, which can he treated as a functionally graded material, FGM (cf. [6]) for a sufficient large number of cells. On the composite boundaries temperature is given, and conductivity coefficients are expressed by first degree polynomial. An effect of nonlinearity and component distribution on the temperature field.
Źródło:
Fizyka Budowli w Teorii i Praktyce; 2011, T. 6, nr 2, 2; 83-85
1734-4891
Pojawia się w:
Fizyka Budowli w Teorii i Praktyce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical creep analysis of FGM rotating disc with GDQ method
Autorzy:
Zharfi, H.
Toussi, H. E.
Powiązania:
https://bibliotekanauki.pl/articles/280599.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
creep
FGM
GDQ method
rotating disc
boundary conditions
Opis:
Rotating discs are the vital part of many kinds of machineries. Usually, they are operating at relatively high angular velocity and temperature conditions. Accordingly, in practice, the creep analysis is an essential necessity in the study of rotating discs. In this paper, the time dependent creep analysis of a thin Functionally Graded Material (FGM) rotating disc investigated using the Generalized Differential Quadrature (GDQ) method. Creep is described with Sherby’s constitutive model. Secondary creep governing equations are derived and solved for a disc with two various boundary conditions and with linear distribution of SiC particles in pure Aluminum matrix. Since the creep rates are a function of stresses, time and temperature, there is not a closed form solution to these equations. Using a solution algorithm and the GDQ method, a solution procedure for these nonlinear equations is presented. Comparison of the results with other existing creep studies in literature reveals the robustness, precision and high efficiency beside rapid convergence of the present approach.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 331-341
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Piezoelectric effect on thermoelastic Lamb waves in functionally graded plates
Autorzy:
Wang, X.
Ren, X.
Yu, J.
Zhou, H.
Zhang, X.
Leng, J
Powiązania:
https://bibliotekanauki.pl/articles/38695708.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
thermoelastic wave
attenuation
FGM
piezoelectric effect
physical field distributions
Opis:
Based on the Lord–Shulman thermoelectric elasticity theory, the piezoelectric effect on the thermoelastic Lamb wave propagation in the functionally graded material (FGM) plate is investigated. The coupled wave equations are solved by employing the Legendre polynomial series approach (LSPA), which poses the advantages of small scale of eigenvalues matrix and a convenient solution. It can directly obtain the complex wave number solutions without iteration. The obtained complex solutions, which represent the wave propagation and attenuation, are compared with those available data. Numerical examples show that the influence of gradient is profound. Results indicate that the piezoelectric effects on attenuation with the open and closed circuit condition are consistent for the S0 and S1 modes, but are inconsistent for the A0 and A1 modes. Although the piezoelectric effect is weak on the dispersion and attenuation of thermal waves, it is notable for their physical field distributions. In addition, the relaxation time is critical to electric displacements of a thermal wave mode, but is not essential for those of Lamb-like modes. The results can be used for the optimization of thermo-electric-elastic coupling structures.
Źródło:
Archives of Mechanics; 2023, 75, 1-2; 3-26
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of FGM plates
Autorzy:
Jemielita, G.
Kozyra, Z.
Powiązania:
https://bibliotekanauki.pl/articles/280423.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
modelling
layer plate
FGM plate
stiffness of the plate
Opis:
The paper presents formulation of the problem of layered plates composed of two various isotropic materials. We assume that the first material M₁ is characterized by the following parameters: Young’s modulus E₁ and Poisson’s ratio ν₁, whereas the second one by E₂ and ν₂, respectively. Let us consider two modelling cases for functionally graded material (FGM) plates. These cases are related to an appropriate distribution of the material within two-layer and three-layer systems. Our objective is to compare the stiffness of both the two-layer and there-layer plates with the FGM plate containing various proportions between the material components M₁ and M₂.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 829-839
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient numerical modeling of functionally graded shell mechanical behavior
Autorzy:
Koubaa, Sana
Mars, Jamel
Dammak, Fakhreddine
Powiązania:
https://bibliotekanauki.pl/articles/117748.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
FGM
UMAT-USDFLD
static
free vibration
statyka
wolne wibracje
Opis:
Numerical analysis of the static bending and free vibration mechanical behavior of FGM are performed using the UMAT-USDFLD subroutines in ABAQUS software. Different combinations of geometries, mechanical loading and boundary conditions are adopted. The material properties according to the coordinates of the integration points are defined in the developed numerical model. The First Order Deformation Theory is used for thin and moderately thick FG shells analysis. The accuracy and the robustness of the numerical model are illustrated through the solution of several non trivial structure problems. The proposed numerical procedure is significantly efficient from the computational point of view.
Źródło:
Applied Computer Science; 2019, 15, 1; 84-94
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the nonlocal interaction range for stability of nanobeams with nonlinear distribution of material properties
Autorzy:
Jankowski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2105997.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
nanobeam
FGM
nonlocal strain gradient theory
buckling
piezoelectric effect
Opis:
The present study analyses the range of nonlocal parameters’ interaction on the buckling behaviour of nanobeam. The intelligent nonhomogeneous nanobeam is modelled as a symmetric functionally graded (FG) core with porosity cause nonlinear distribution of material parameters. The orthotropic face-sheets are made of piezoelectric materials. These kinds of structures are widely used in nanoelectromechanical systems (NEMS). The nanostructure model satisfies the assumptions of Reddy third-order beam theory and higher-order nonlocal elasticity and strain gradient theory. This approach allows to predict appropriate mechanical response of the nanobeam regardless of thin or thick structure, in addition to including nano-sized effects as hardening and softening. The analysis provided in the present study focuses on differences in results for nanobeam stability obtained based on classical and nonlocal theories. The study includes the effect of diverse size-dependent parameters, nanobeams’ length-to-thickness ratio and distributions of porosity and material properties through the core thickness as well as external electro-mechanical loading. The results show a dependence of nonlocal interaction range on geometrical and material parameters of nanobeam. The investigation undertaken in the present study provides an interpretation for this phenomenon, and thus aids in increasing awareness of nanoscale structures’ mechanical behaviour.
Źródło:
Acta Mechanica et Automatica; 2022, 16, 2; 151--161
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zagadnienie zakrzywionej anizotropowej oraz funkcjonalnie gradowanej powłoki poddanej działaniu pola temperatury
Problem of curvilinear anisotropic and functionally gradated coating subjected to temperature field
Autorzy:
Szubartowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/194916.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
materiał funkcjonalnie gradientowy
termosprężystość
FGM
functional gradient material
thermo-elasticity
Opis:
Praca dotyczy problematyki zakrzywionej powłoki wykonanej z anizotropowego materiału o funkcyjnej gradacji. W rachunku wykorzystano koncepcję tensora krzywizny Riemanna-Christoffela wzbogaconą o wpływ pola temperatury przez obecność tensora właściwości termicznych. W ramach wykonanych obliczeń różnica wektora poddanego koneksji afinicznej wzdłuż infinitezymalnego czworokąta wyraża się, zależnie od drogi przejścia, sumą zarówno efektu geometrycznego, reprezentowanego tensorem krzywizny Riemanna-Christoffela, jak również efektu termicznego wyrażonego przez symbol krzywizny termicznej.
This work concerns the problem of a curvilinear shell made of anisotropic material with functional gradation. The calculus is based on the concept of the Riemann-Christoffel curvature tensor enhanced by the influence of temperature field through the presence of a thermal tensor. Calculations comprise estimation of the difference of a vector subjected to the affine connection along the infinitesimal quadrangle expressed, correspondingly to the shifting path, by a sum of both the geometric effect, represented by the Riemann-Christoffel curvature tensor, as well as certain symbol of the thermal curvature.
Źródło:
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2018, z. 90 [298], 2; 237-244
0209-2689
2300-5211
Pojawia się w:
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Analysis of Sintered Gradient Materials Based on Distaloy SE Powder
Autorzy:
Zarębski, K.
Nykiel, M.
Powiązania:
https://bibliotekanauki.pl/articles/355387.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
functionally graded materials (FGM)
powder metallurgy (PM)
low-alloy steels
Opis:
The study describes the microstructural analysis of cylindrically-shaped functionally graded products sintered from iron powder with scheduled graded structure on the cross-section running from the core to the surface layer of the sinter. Different types of structure were produced using Distaloy SE powder in two compositions - one without the addition of carbon, and another with 0.6wt% C. Two methods were used to fill the die cavity and shape the products. The first method involving a two-step compaction of individual layers. The second method using an original technique of die filling enabled the formation of transition zone between the outer layer and the core still at the stage of product shaping. As part of microstructural analysis, structural constituents were identified and voids morphology was examined. Studies covered the effect of the type of the applied method on properties of the graded zone obtained in the manufactured products.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 613-620
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manufacturing of ZrO2-Ni graded composites via centrifugal casting in the magnetic field
Autorzy:
Wachowski, M.
Kosturek, R.
Winkler, H.
Miazga, A.
Lada, P.
Kaszuwara, W.
Konopka, K.
Zygmuntowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/200807.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ZrO2-Ni
ceramic matrix composites
FGM
microstructure
magnetic field
Opis:
The paper presents the possibility of fabricating ceramic-metal composites by an innovative method of centrifugal slip casting in the magnetic field. It was examined whether the use of this method would allow obtaining a gradient concentration of metal particles in the ceramic matrix. In the applied technique, the horizontal rotation axis was used. The study investigated the effect of solid phase content on the properties and microstructure of the products. Water-based suspensions with 35, 40, 45 and 50 vol.% of solid-phase content were prepared with 10 vol.% additional of nickel powder. The viscosity of prepared slurries was considered. The gradient distribution of nickel particles in the zirconia matrix was observed on SEM. Vickers hardness of ZrO2-Ni composites has been measured. The research revealed that the physical properties depend on the volume fraction of solid content and increase as the volume of solid content increases.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 539-545
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Violations of children’s rights in Sudan and their circumstances: the current situation and the possibility of solutions
Autorzy:
KARAMALLA-GAIBALLA, NAGMELDIN
Powiązania:
https://bibliotekanauki.pl/articles/1202990.pdf
Data publikacji:
2021-05-15
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Sudan
Darfur
children's rights
child labour
FGM/C
underage marriage
Opis:
This paper aims to demonstrate the main aspects and weaknesses of children's rights in Sudan and describe how to work towards enhancing the immediate response to violations against children. This discussion will help develop future plans to strengthen the enforcement of children’s rights in Sudan and create an environment that protects children's rights against all kinds of violations. This paper presents the current situation of children’s rights violations in Sudan and factors that have a great and direct impact on these situations, especially social and cultural factors concerning female circumcision, genital mutilation, and marriage of underage girls; and laws that violate the dignity of Sudanese children, such as laws related to flogging, imprisonment, and death. The article also addresses issues of wars and internal conflicts and their impact on children, including their recruitment and trafficking. It also discusses the weaknesses of laws in place to protect children in Sudan and the changes these laws have undergone in recent years, especially the fundamental changes following the revolution that broke out in Sudan in 2018, which replaced the dictatorial military regime with Islamic orientations and trying to find objective solutions.
Źródło:
Society Register; 2021, 5, 2; 57-68
2544-5502
Pojawia się w:
Society Register
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 36

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