Temat: critical buckling load - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Parameters optimization of MAG welding for enhancing the mechanical properties and buckling behaviour of welded steel
Autorzy:: Alwan, A. H.
Mahmood, N. Y.
Powiązania:: https://bibliotekanauki.pl/articles/368428.pdf
Data publikacji:: 2020
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: MAG welding parameters
critical buckling load
Taguchi method
ANOVA
optimization
spawanie MAG
parametry spawania
metoda Taguchi
optymalizacja
Opis:: Purpose: The influence of metal active gas welding variables, including current, wire feeding speed and gas flow rate on the ultimate tensile strength and critical buckling load of steel (St.24) and the optimized welding conditions were discussed. Design/methodology/approach: The experimental steps are firstly designing the experiments, secondly conducting the mechanical tests, thirdly analysing the results through Minitab 16 and finally determining the optimum welding parameters. Confirmation tests of the optimized variables were validated. Findings: ANOVA approach manifested that the significant effect of welding variable on the tensile strength was the gas flow rate, while the current was on the critical buckling load. The results are confirmed and given the optimum values. Research limitations/implications: The influence of MAG welding variables (current, wire feeding speed and gas flow rate) on the tensile and buckling strengths of steel will be investigated in order to avoid the failure of many welded assemblies in the structures due to the buckling, in addition to reduce the requirement of long time and high cost to produce such assemblies. Therefore, it is necessary to find a solution to encounter the difficulties in their welding process. Practical implications: The major challenge was how to reduce the time and cost beside gaining the optimum properties through the designed experiments. Originality/value: The results may be helpful to design any welded joints in machine frames, structural steel connections and crane structures at the optimum condition.
Źródło:: Journal of Achievements in Materials and Manufacturing Engineering; 2020, 99, 1; 5-13
1734-8412
Pojawia się w:: Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Influence of Composite Lay-Up and the Shape of the Closed Section on the Stability of the Structure
Autorzy:: Czajka, Błażej
Różyło, Patryk
Powiązania:: https://bibliotekanauki.pl/articles/2172346.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: buckling
composite closed-section profiles
critical load
FEM
Opis:: Stability tests of a thin-walled composite structure with a closed section are presented in this paper. The purpose of this paper is to conduct preliminary studies in the context of numerical simulations of critical and slightly post-buckling states. The tests were conducted based only on numerical simulations by the finite element method. Numerical simulations were conducted using ABAQUS software, which allowed to determine the values of critical loads and their corresponding buckling forms. The influence of layer arrangement on the stability of the structure was studied. Carbon-epoxy laminate (CEL) was used in the tests. It is shown that there are composite lay-ups that show more than 1.3 times higher stiffness than the other cases. The paper demonstrates the dependence of the influence of the arrangement of layers on the stability of the structure, which will provide the basis for planned experimental studies (the results require experimental verification, which will be carried out in subsequent studies).
Źródło:: Advances in Science and Technology. Research Journal; 2022, 16, 2; 216--224
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Sensitivity analysis of buckling loads of bisymmetric I-section columns with bracing elements
Analiza wrażliwości siły krytycznej słupa cienkościennego ze stężeniami
Autorzy:: Iwicki, P.
Powiązania:: https://bibliotekanauki.pl/articles/231468.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: analiza wrażliwości
słup cienkościenny
stężenie
sztywność
siła krytyczna
wyboczenie
sensitivity analysis
thin-walled beam
stiffener
stiffness
critical load
buckling
Opis:: The first order variation of critical loads of thin-walled columns with bisymmetric open cross-section due to some variations of the stiffness and location of bracing elements is derived. The considerations are based on the classical linear theory of thin-walled beams with non-deformable cross-section introduced by Vlasov. Both lateral braces and braces that restraint warping and torsion of the cross-section have been taken into account. In the numerical examples dealing with I-column, the functions describing the influence of location of the braces with unit stiffness on the critical load of torsional and flexural buckling are derived. The linear approximation of the exact relation of the critical load due to the variation of the stiffness and location of braces is determined.
Wyznaczono pierwszą wariację siły krytycznej wyboczenia słupa o przekroju bisymetrycznym otwartym przy wariacji sztywności i położenia stężeń. Przyjęto założenia klasycznej teorii prętów cienkościennych o nieodkształcalnym przekroju poprzecznym. Analizowano zarówno stężenia boczne jak i stężenia ograniczające spaczenie oraz skręcenie przekroju poprzecznego. Stężenia modelowano jako podpory sprężyste. W przykładzie numerycznym zbadano wrażliwość siły wyboczenia skrętnego i giętego słupa o przekroju dwuteowym przy wariacji sztywności i położenia stężeń. Wyznaczono funkcje podcałkowe wrażliwości opisujące wpływ wprowadzenia wzdłuż długości pręta dodatkowych stężeń o jednostkowej sztywności na wartość siły krytycznej. Ponadto wyznaczono liniową aproksymację względnej wartości sił krytycznych pręta przy wariacji sztywności i położenia stężeń.
Źródło:: Archives of Civil Engineering; 2010, 56, 1; 69-88
1230-2945
Pojawia się w:: Archives of Civil Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Flexural vibration and buckling analysis of single-walled carbon nanotubes using different gradient elasticity theories based on Reddy and Huu-Tai formulations
Autorzy:: Karličić, D.
Kozić, P.
Pavlović, R.
Powiązania:: https://bibliotekanauki.pl/articles/279656.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: natural frequency
critical buckling load
gradient elasticity theories
nonlocal behavior
Opis:: The aim of the present work is to analyze free flexural vibration and buckling of single-walled carbon nanotubes (SWCNT) under compressive axial loading based on different constitutive equations and beam theories. The models contain a material length scale parameter that can capture the size effect, unlike the classical Euler-Bernoulli or Reddy beam theory. The equations of motion of the Reddy and the Huu-Tai beam theories are reformulated using different gradient elasticity theories, including stress, strain and combined strain/inertia. The equations of motion are derived from Hamilton’s principle in terms of the generalized displacements. Analytical solutions of free vibration and buckling are presented to bring out the effect of the nonlocal behavior on natural frequencies and buckling loads. The presented theoretical analysis is illustrated by a numerical example, and the results are qualitatively compared by another results.
Źródło:: Journal of Theoretical and Applied Mechanics; 2015, 53, 1; 217-233
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Elastic buckling of a triangular frame subject to in-plane tension
Autorzy:: Magnucki, K.
Milecki, S.
Powiązania:: https://bibliotekanauki.pl/articles/949273.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: triangular frame
elastic buckling
critical load
mathematical model
Opis:: The paper is devoted to elastic buckling of a symmetrical triangular frame under tensile in-plane load. Three mathematical models of the triangular frame are formulated. The first model deals with the pre-buckling state, the second one with the in-plane buckling state, and the third one with the lateral buckling state of the frame. The FEM-numerical model of the frame is formulated and the critical loads are calculated. The comparison of the results obtained in the analytical and numerical-FEM analysis is presented in tables and graphs in figures.
Źródło:: Journal of Theoretical and Applied Mechanics; 2015, 53, 3; 581-591
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The Influence of Composite Lay-Up on the Stability of a Structure with Closed Section
Autorzy:: Różyło, Patryk
Dębski, Hubert
Powiązania:: https://bibliotekanauki.pl/articles/2022295.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: buckling
composite closed-section profiles
critical load
FEM
Opis:: This paper presents a study on the stability of a composite structure with a closed section. The research was carried out solely based on numerical simulations using the finite element method. ABAQUS software was used to conduct numerical simulations, which allowed to determine the values of critical loads, as well as the corresponding forms of buckling. As part of the research, the influence of composite material arrangement of layers on the stability of the structure was analyzed. The study was conducted on a composite material, which is a carbon-epoxy composite (CFRP). The obtained research results will be verified in subsequent studies by the results of experimental tests.
Źródło:: Advances in Science and Technology. Research Journal; 2022, 16, 1; 260-265
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Combined load buckling for cylindrical shells based on a symplectic elasticity approach
Autorzy:: Sun, J.
Xu, X.
Lim, C. W.
Powiązania:: https://bibliotekanauki.pl/articles/281463.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: buckling mode
combined loads
critical load
cylindrical shell
symplectic method
Opis:: Buckling behavior of cylindrical shells subjected to combined pressure, torsion and axial compression is presented by employing a symplectic method. Both symmetric and non- -symmetric boundary conditions are considered. Hamiltonian canonical equations are established by introducing four pairs of dual variables. Then, solution of fundamental equations is converted into a symplectic eigenvalue problem. It is concluded that the influence of pressure on buckling solutions is more significant than that due to compressive load, in particular for a longer external pressured cylindrical shell. Besides, buckling loads and circumferential wavenumbers can be reduced greatly by relaxed in-plane axial constraints.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 705-716
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Mechanical nature of a single walled carbon nanotube using Legendre’s polynomials
Autorzy:: Tiwari, P.
Nagar, P.
Powiązania:: https://bibliotekanauki.pl/articles/279475.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: Euler-Bernoulli’s beam theory
nonlocal elasticity theory
Legendre’s polynomial
aspect ratio
critical buckling load
Winkler and Pasternak elastic constants
Opis:: This paper is concerned with the mechanical response of a single-walled carbon nanotube. Euler-Bernoulli’s beam theory and Hamilton’s principle are employed to derive the set of governing differential equations. An efficient variational method is used to determine the solution of the problem and Legendre’s polynomials are used to define basis functions. Significance of using these polynomials is their orthonormal property as these shape functions convert mass and stiffness matrices either to zero or one. The impact of various parameters such as length, temperature and elastic medium on the buckling load is observed and the results are furnished in a uniform manner. The degree of accuracy of the obtained results is verified with the available literature, hence illustrates the validity of the applied method. Current findings show the usage of nanostructures in vast range of engineering applications. It is worth mentioning that completely new results are obtained that are in validation with the existing results reported in literature.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1153-1162
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Wpływ właściwości mechanicznych okładzin i rdzenia na stateczność belek trójwarstwowych poddanych zginaniu trójpunktowemu
The influence of mechanical properties of the faces and the core on the stability of three-layered beams subjected to three-point bending
Autorzy:: Wstawska, I.
Powiązania:: https://bibliotekanauki.pl/articles/134702.pdf
Data publikacji:: 2017
Wydawca:: ADVSEO
Tematy:: stability
buckling
three-layered beam
three-point bending
critical load
FEM model
Opis:: The objective of this work is the numerical analysis of the stability of three-layered beams with a metal foam core. The beams were subjected to three-point bending. The analysis of the local buckling and the influence of material properties of the faces and the core on critical loads and buckling shape was performed. The calculations were made in elastic range on a family of beams with different mechanical properties of the faces and the core. Calculations of critical loads and buckling shape were performed. The analysis of the finite element model (FEM) of three-layered beam has been performed with the use of ANSYS software. The upper and the lower face have been retreated from the core by half of the thickness. Tie constrains have been applied between the core and the faces. Due to symmetry of the model only a quarter of the beam has been modelled with proper boundary conditions on the symmetry planes.
Źródło:: Technical Issues; 2017, 2; 42-47
2392-3954
Pojawia się w:: Technical Issues
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Buckling analysis of three-layered rectangular plate with piezoelectric layers
Autorzy:: Yaghoobi, H.
Rajabi, I
Powiązania:: https://bibliotekanauki.pl/articles/282015.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: three-layered rectangular plate
piezoelectric
critical buckling load
Opis:: This paper employs an analytical method to analyze the buckling of piezoelectric coupled plates with different boundary conditions on the basis of the first order shear deformation plate theory. The structure is composed of a host isotropic plate and two bonded piezo electric layers. Convergence study is performed in order to verify the numerical stability of the presented method. Also, the present analysis is validated by comparing the results with those in the literature, and then the critical buckling load of the piezoelectric coupled plates is presented in tabular and graphical forms for different plate aspect ratios, thickness of the piezoelectric, actuator voltage and boundary conditions.
Źródło:: Journal of Theoretical and Applied Mechanics; 2013, 51, 4; 813-826
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: On the buckling and vibrational response of carbon nanotubes with spiral deformation
Autorzy:: Yengejeh, S. I.
Kazemi, S. A.
Öchsner, A.
Powiązania:: https://bibliotekanauki.pl/articles/281449.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: finite element method
carbon nanotubes
natural frequency
critical buckling load
spiral shape
Opis:: Perfect and spiral models of carbon nanotubes (CNTs) have been simulated based on the finite element method and their vibrational and buckling behavior has been investigated. In order to evaluate their natural frequency and critical buckling load, computational tests have been conducted. It has been concluded that the existence of any geometrical modification in the configuration of perfect CNTs results in a remarkable reduction in the natural frequency and critical buckling load of CNTs. It has been also revealed that the analytical solutions are in good agreement with the finite element simulation results in the cases of perfect and spiral CNTs.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 613-619
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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