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    Wyświetlanie 1-9 z 9
    Tytuł:
    A study of the preload force in metal-elastomer torsion springs
    Autorzy:
    Sikora, W.
    Michalczyk, K.
    Machniewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/386440.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    hyperelastic materials
    neidhart spring
    metal-elastomer spring
    FEM
    finite element method
    materiał hiperelastyczny
    elastomer
    metoda elementów skończonych
    MES
    Opis:
    Neidhart type suspension units composed of metal-elastomer torsion springs can be a good alternative to steel helical springs in applications such as vibration absorbers or vehicle suspension systems. Assembling this type of spring requires initial preload of the elastomeric working elements, which determines their operating properties.The results of experimental tests and numerical simulations concerning the preload of elastomeric working elements in Neidhart type suspension units are presented in the paper. The performed research made it possible to propose a new calculation model for determining the preload force value acting on the elastomeric cylindrical elements applied in this type of suspension unit. The results obtained using the proposed model exhibit good convergence with FEM simulation results within the range of the tested geometrical and material properties.
    Źródło:
    Acta Mechanica et Automatica; 2016, 10, 4; 300-305
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupled static and dynamic buckling modelling of thin-walled structures in elastic range review of selected problems
    Autorzy:
    Kołakowski, Z.
    Teter, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/387475.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    interaction
    buckling
    thin-walled structures
    FEM
    analytical-numerical method
    review
    odkształcenia
    konstrukcje cienkościenne
    metoda analityczno-numeryczna
    metoda elementów skończonych
    MES
    Opis:
    A review of papers that investigate the static and dynamic coupled buckling and post-buckling behaviour of thin-walled structures is carried out. The problem of static coupled buckling is sufficiently well-recognized. The analysis of dynamic interactive buckling is limited in practice to columns, single plates and shells. The applications of finite element method (FEM) or/and analytical-numerical method (ANM) to solve interaction buckling problems are on-going. In Poland, the team of scientists from the Department of Strength of Materials, Lodz University of Technology and co-workers developed the analytical-numerical method. This method allows to determine static buckling stresses, natural frequencies, coefficients of the equation describing the post-buckling equilibrium path and dynamic response of the plate structure subjected to compression load and/or bending moment. Using the dynamic buckling criteria, it is possible to determine the dynamic critical load. They presented a lot of interesting results for problems of the static and dynamic coupled buckling of thin-walled plate structures with complex shapes of cross-sections, including an interaction of component plates. The most important advantage of presented analytical-numerical method is that it enables to describe all buckling modes and the post-buckling behaviours of thin-walled columns made of different materials. Thin isotropic, orthotropic or laminate structures were considered.
    Źródło:
    Acta Mechanica et Automatica; 2016, 10, 2; 141-149
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite element analysis of temperature distribution in axisymmetric model of disc brake
    Autorzy:
    Grześ, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/386492.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    metoda elementów skończonych
    MES (metoda elementów skończonych)
    rozkład temperatury
    hamowanie
    finite element method
    FEM
    temperature distribution
    braking
    Opis:
    A transient thermal analysis is developed to examine temperature expansion in the disc and pad volume under simulated operation conditions of single braking process. This complex problem of frictional heating has been studied using finite element method (FEM). The Galerkin algorithm was used to discretize the parabolic heat transfer equation for the disc and pad. FE model of disc/pad system heating with respect to constant thermo-physical properties of materials and coefficient of friction was performed. The frictional heating phenomena with special reference to contact conditions was investigated. An axisymmetric model was used due to the proportional relation between the intensity of heat flux perpendicular to the contact surfaces and the rate of heat transfer. The time related temperature distributions in axial and radial directions are pre- sented. Evolution of the angular velocity and the contact pressure during braking was assumed to be nonlinear. Presented transient finite element analysis facilitates to determine temperature expansion in special conditions of thermal contact in axisymmetric model.
    Źródło:
    Acta Mechanica et Automatica; 2010, 4, 4; 23-28
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local and distortional buckling of axially loaded cold rolled sigma profiles
    Autorzy:
    Ciesielczyk, K.
    Rzeszut, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/387559.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    cold rolled sigma profiles
    local and distortional buckling
    eurocode 3
    finite element method
    FEM
    walcowanie na zimno
    eurokody
    metoda elementów skończonych
    MES
    profil walcowany
    Opis:
    In this paper the local and distortional buckling analyses of axially loaded cold-rolled channel and sigma profiles were performed. The critical buckling load was computed by solving the linear eigenvalue problem for different numerical models using Finite Element Method and simplified formulas implemented in Eurocode and proposed by Hancock and Schafer. The buckling analyses were conducted to prove that the sigma cross-section can be successfully replaced by channel cross-section with additional elastic supports placed in folds of the web. It was demonstrated that the folds in the web of the sigma cross-section (additional elastic supports) reduce the slenderness of the web. So, the critical distortional stress can be calculated based on analytical formulas derived for the channel crosssection taking into account the web height between the folds.
    Źródło:
    Acta Mechanica et Automatica; 2016, 10, 3; 218-222
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Analysis of IED Detonation Effect on Steel Plate
    Autorzy:
    Barnat, W.
    Panowicz, R.
    Niezgoda, T.
    Dybcio, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/387041.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    fala uderzeniowa
    improwizowane ładunki wybuchowe
    MES (metoda elementów skończonych)
    blast wave
    IED
    improvised explosive device
    FEM
    finite element method
    Opis:
    The article presents the results of initial works on protection of vehicles crews against improvised explosive mechanisms (charges) IED. The presented coupled problem of explosion and interaction of pressure impulse coming from detonation was described in available standard documents. The presented results are the introduction to works oncomposed protective layers applied in vehicles.
    Źródło:
    Acta Mechanica et Automatica; 2012, 6, 1; 10-12
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and Experimental Comparison of Combined Multilayer Protective Panels
    Autorzy:
    Barnat, W.
    Panowicz, R.
    Niezgoda, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/387055.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    MES (metoda elementów skończonych)
    fala uderzeniowa
    interakcja struktury płynu
    elastomery
    panel energochłonny
    FEM
    blast wave
    fluid structure interaction
    elastomers
    protective panel
    Opis:
    The paper presents numerical and experimental analysis of combined multilayer protective panels. The developed structures are prospective solutions for enhancing protection of military vehicles and crucial elements of pipelines especially in places like river crossings.
    Źródło:
    Acta Mechanica et Automatica; 2012, 6, 1; 148-153
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical-Experimental Investigation of Squared-Based Metal Pyramids Loaded with A Blast Wave From A Small Explosives Charge
    Autorzy:
    Panowicz, R.
    Barnat, W.
    Niezgoda, T.
    Szymańczyk, L.
    Grzymkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/387276.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    MES (metoda elementów skończonych)
    fala uderzeniowa
    interakcja struktury płynu
    FEM
    blast wave
    flud structure interaction
    Opis:
    The paper presents the results of computer simulation and experimental investigation of blast wave action arising from a small explosive charge on a metal pyramid with a square base. This explicit finite element has been used to perform numerical analyses. This method is included in the Ls-Dyna software for modelling the behaviour of the pyramid exposed to the action of a pressure wave arising from the detonation of an explosive charge. The detonation process was described in programming bubble structure interaction was used to describe an influence of a blast wave on the structure.
    Źródło:
    Acta Mechanica et Automatica; 2012, 6, 1; 49-52
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stress concentration resulting from irregular shape of explosively cladded materials connections – FEM simulation
    Autorzy:
    Kurek, A.
    Niesłony, A.
    Kurek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/387039.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    FEM
    finite element method
    explosive cladding
    interference zone
    metoda elementów skończonych
    zgrzewanie wybuchowe
    Opis:
    The paper contains a numerical analysis of interface zone steel-titanium bimetal obtained by explosive cladding method. Due to the waviness of the zone, and various properties of the constituent material of the materials type contain structural notch. Therefore it is important inter alia in terms of presentation of the results of fatigue are the maximum stresses that occur just in the area of the zone. In the paper the stress concentration factor and the proposed method of modelling the joint zone of a sinusoidal profile, characterized by the same coefficient of stress concentration at the actual profile.
    Źródło:
    Acta Mechanica et Automatica; 2014, 8, 2; 103-106
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The study of stab resistance of dry aramid fabrics
    Autorzy:
    Barnat, W.
    Sokołowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/387632.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    numerical model
    dry fabric
    FEM
    aramid fabric
    composite
    model numeryczny
    metoda elementów skończonych
    kompozyt
    Opis:
    The paper presents the issue of a knife proof ballistic package. This issue was emphasized since most of modern vests are de-signed to match the threat posed to them only by firearms. There was observed negligence of protection against melee attacks. There is, thus, a need to develop a research methodology in this matter, because it is a valid and necessary problem in a modern developed so-ciety. The aim of this study was to perform a numerical model which simulated the phenomenon of penetration of a ballistic package by an engineering blade. Specification of an engineering blade was taken from standard NIJ Standard-0115.00. Commercial software LS-DYNA was used to carry out the analysis.
    Źródło:
    Acta Mechanica et Automatica; 2014, 8, 1; 53-58
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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