Temat: FEM model parameters - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Numerical modelling of a selected part of the airplane fuselage
Autorzy:: Szymczyk, E.
Orzyłowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/247514.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: riveted joint
FEM model parameters
Opis:: Analysis of a riveted lap joint, the part of M-28 Skytruck fuselage, is presented. The aim of the paper is a proper choice of finite element mesh parameters (shape and density) around the rivet hole as well as a study of the influence of different sheets thickness on secondary bending. Riveting still remains the most popular method of joining metal and composite parts of the aircraft structure. During the operation (service) the severe stress concentrations and the effects such as fretting and secondary bending occur, thus reducing fatigue life. The specimen consists of two thin sheets (0.6 and 1.2 mm thick) stiffened with a 3 mm thick frame. The parts are connected by 14 rivets (3.5 mm diameter) and 8 rivets (3 mm diameter). Overall specimen dimensions are following: length 682 mm, width 136 mm, rivets pitch 17 mm. The riveted joint is subjected to a tensile load. The analysis of large parts of structures like fuselages, wings or multi-row riveted specimens can be performed using global shell models. The correct stress state in global modelling can be obtained by taking into consideration the hole in the sheet, the rivet axis (as a rigid or beam element) and contact elements between the rivet and the hole as well as between the sheets. Deformation of the joint and stress state are calculated. Large difference between sheets thickness causes non-physical deformation of the rivet cross sections. Proper deformations of the joint are obtained by increasing stiffness of those sections in a thinner sheet. Results are compared with an experimental investigation and applied to estimations of specimen fatigue life.
Źródło:: Journal of KONES; 2010, 17, 2; 459-465
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Building a numerical model for bulk materials from standard shear test data
Autorzy:: Feise, H.
Daiss, A.
Powiązania:: https://bibliotekanauki.pl/articles/1955777.pdf
Data publikacji:: 2003
Wydawca:: Politechnika Gdańska
Tematy:: constitutive model
FEM
silo flow material parameters stress
Opis:: While numerical methods have become an integral part of everyday work in process engineering for fluid processes, there is a curious lack of such methods in the field of solid handling. One of the reasons may be the inability of the most often used CFD codes to handle bulk solids. In the paper an attempt is made to show how the behaviour of bulk solids can be modelled using a CFD code without a specific constitutive model for bulk solids. Another reason for not using numerical tools to handle bulk materials is the difficulty of generating the necessary material parameters. Those material models suitable for bulk solids that are available in commercial packages are mostly derived from soil mechanics. Their parameters are determined using a triaxial cell. This device is generally not available in the chemical industries and most often not suitable for bulk solids, due to the high stress levels applied in those tests. In the paper a method is presented which allows the use of standard shear test data, supplemented by data from a compression tests in a "lambda-meter", to determine the parameters of an extended Drucker-Prager model with a compressive yield cap. Model equations are given and parameters are determined for white polymer powder. With these parameters a simulation of silo discharge has been performed successfully using a CFD code. To make CFD codes, which already have the much-needed multi-phase capability, capable of handling bulk solid flow, significant work remains to be done (e.g. shear stresses at rest and anisotropic stress tensors).
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 4; 539-547
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Research of the Tool Velocity and Product Shape Aspects of the Hot Radial Rolling of C45 Steel Rings
Autorzy:: Surdacki, Piotr
Gontarz, Andrzej
Winiarski, Grzegorz
Samołyk, Grzegorz
Powiązania:: https://bibliotekanauki.pl/articles/2023794.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: experimental research
process parameters
FEM model
ring rolling process
badania eksperymentalne
parametry procesu
model FEM
proces walcowania pierścieni
Opis:: The control of product shape and dimensions poses some problems in hot ring rolling. In the rolling process, material flows both circumferentially and axially, which leads to increased ring height. Changes in shape and dimensions of ring cross section depend on several process parameters, which makes it difficult to predict ring diameter. This paper presents the results of a study investigating the hot radial rolling process for C45 steel rings in terms of the effect of main roll feed speed on product geometry. It was found that the application of a higher feed speed of the main roll and thus of a greater ratio between this speed and circumferential speed of the main roll led to increased axial material flow and reduced cross-sectional defect known as ”fishtail”. Machining losses generated due to cross-sectional defects were also determined. Results were used to determine the feed speed to circumferential speed ratio ensuring the lowest possible cross-sectional defect and material consumption.
Źródło:: Advances in Science and Technology. Research Journal; 2021, 15, 4; 352-363
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Identyfikacja siły docisku i parametrów sprężystych w kontakcie tarciowym wału z wargowym pierścieniem uszczelniającym
Identification of contact force and of elastic parameters in the zone of frictional contact of the shaft with a lip sealing ring
Autorzy:: Grabka, L.
Spałek, J.
Szweda, S.
Powiązania:: https://bibliotekanauki.pl/articles/188574.pdf
Data publikacji:: 2015
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: tarcie
uszczelnienie stykowe wału
parametry sprężyste kontaktu
modelowanie MES
friction
rotary seal
elastic parameters
model FEM
Opis:: W opracowaniu przedstawiono istotny etap analityczno-modelowego podejścia do określenia podstawowych parametrów definiujących moment tarcia generowany w strefie styku elastomerowego pierścienia uszczelniającego z wałem o złożonej strukturze warstwy wierzchniej. Obejmuje on: wyznaczenie siły promieniowego oddziaływania pierścienia uszczelniającego na wał z wykorzystaniem modelu węzła uszczelniającego i metody elementów skończonych oraz wyznaczenie zastępczych parametrów sprężystych styku wargowego pierścienia uszczelniającego ze złożoną strukturalnie warstwą wierzchnią wału. Wyznaczone parametry w połączeniu ze zbiorem wyników testów odbiorczych uszczelnień umożliwią predykcję czynników wpływających na opory tarcia w tym uszczelnieniu.
An analytical and model approach for the determination of main parameters defining the moment of friction generated in the zone contact of an elastomeric sealing ring with a shaft with a complex covering layer. The approach includes the determination of the force of the radial action of the sealing ring on the shaft with use of sealing node model and finite elements method as well as the determination of substitute elastic parameters of the lip contact of the sealing ring with the structurally complex cover layer of the shaft. Determined parameters in combination with a set of test results enabled predicting the factors affecting the friction resistance in this seal.
Źródło:: Tribologia; 2015, 1; 37-47
0208-7774
Pojawia się w:: Tribologia
Dostawca treści:: Biblioteka Nauki

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