Wszystkie pola: finite element - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Finite element method in car compatibility phenomena
Autorzy:: Lisiecki, M.
Powiązania:: https://bibliotekanauki.pl/articles/246189.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: compatibility
crash
biomechanics
simulation
transport
Opis:: The main aim of the study is the side impact of the truck into the passenger car, which is one of the possible variants in compatibility case. The compatibility problem has direct influence at biomechanical injuries of the passengers travelling by the cars and also at deformation of the structure. This research should assign critical configurations of the truck and the car during side impact. Critical criteria of compatibility problem are biomechanical injuries structure deformation. The research was performed with Chrysler Neon mode, automotive seating (metal construction), Hybrid III dummy model and moving barrier with changed mass (equals to the mass of the heavy truck KAMAZ) and equipped with front underrun protection barrier (FUP - based on the geometry of the Mercedes ACTROS front structure). Interaction between car and heavy truck is at the driver side. During the research different location and angles of the barrier against the car has been taken into account. Two speeds were used to investigate the barrier influence to the car. The results of the simulation allow predicting the biomechanical coefficients such as: HIC, 3 ms, TTI, e.g., which give the overview of the passenger injuries. The other set of the data is plastic deformations which are visible at the Front Underrun Protection (FUP) barrier and also at the passenger car construction. The results of research allows to assign the direction ofthe changes which should be proposed to the truck manufactures in order to reduce passengers biomechanical injuries and intrusion into car during side impact.
Źródło:: Journal of KONES; 2010, 17, 1; 241-247
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Finite element method in car compatibility phenomena
Autorzy:: Lisiecki, M.
Powiązania:: https://bibliotekanauki.pl/articles/247204.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: compatibility
crash
biomechanics
simulation
transport
Opis:: The main aim of the study is the side impact of the truck into the passenger car, which is one of the possible variants in compatibility case. The compatibility problem has direct influence at biomechanical injuries of the passengers travelling by the cars and also at deformation of the structure. This research should assign critical configurations of the truck and the car during side impact. Critical criteria of compatibility problem are biomechanical injuries structure deformation. The research was performed with Chrysler Neon mode, automotive seating (metal construction), Hybrid III dummy model and moving barrier with changed mass (equals to the mass of the heavy truck KAMAZ) and equipped with front under run protection barrier (FUP - based on the geometry of the Mercedes ACTROS'front structure). Interaction between car and heavy truck is at the driver side. During the research different location and angles of the barrier against the car has been taken into account. Two speeds were used to investigate the barrier influence to the car. The results of the simulation allow predicting the biomechanical coefficients such as: HIC, 3ms, TTI, e.g., which give the overview of the passenger injuries. The other set of the data is plastic deformations which are visible at the Front Underrun Protection (FUP) barrier and also at the passenger car construction. The results of research allows to assign the direction of the changes which should be proposed to the truck manufactures in order to reduce passengers biomechanical injuries and intrusion into car during side impact.
Źródło:: Journal of KONES; 2011, 18, 4; 234-241
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Development of finite element model of shunting locomotive applicable for dynamic analyses
Autorzy:: Dziewulski, P.
Szurgott, P.
Powiązania:: https://bibliotekanauki.pl/articles/247466.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite element method
modelling
dynamic analysis
crash test
railway vehicle
LS-DYNA
HyperMesh
Opis:: The main aim of this study is to develop a finite element model of the hybrid-shunting locomotive. Considered locomotive is based on a popular shunting locomotive in Poland – SM42. All components above the locomotive frame could be modified in comparison to the original object, whereas a chassis was essentially unchanged. Such solution allows the operators freely configure components e.g. diesel engine, generator, cooling module, cab etc., according to their own requirements. Works on the FE model were focused on very accurate reflection of the locomotive frame since the planned dynamic analyses include crash tests. FE model of the frame has a fine mesh and it is considered as a deformable component. Other segments of the vehicle are simplified and treated as rigid bodies mostly. FE model was developed on the basis of the locomotive CAD model. It was decided to transform the CAD model of the frame into the FE one applying the midsurface procedure. Such approach is correct since the locomotive frame is made of a large number of steel elements in the form of sheet metal plates and sections welded together. Altair Hyper Mesh software was used in the FE model developing process. Appropriate connections between respective components of the model e.g. wheelset – bogie, bogie – locomotive frame, were applied. Finally, the locomotive FE model consists of about 116 thousands of finite shell and solid elements and about 125 thousands of nodes. Dynamic analyses of the locomotive FE model will be carried out using LS-DYNA computer code.
Źródło:: Journal of KONES; 2014, 21, 4; 95-102
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Experimental identification of hyperelastic material parameters for calculations by the finite element method
Autorzy:: Czabanowski, R.
Powiązania:: https://bibliotekanauki.pl/articles/950175.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite element method
elastomer
experimental identification
Opis:: Elastomer materials are commonly used in manufacture of parts of machines and vehicles. A numerical analysis of these elements is possible with many calculation methods, however, due to such properties as incompressibility, very often large deformations, non-linear constitutive compounds, friction and contact phenomena, an analysis by the fmite element method turns out to be a very complicated task. The purpose of experimental studies which were carried out was to determine parameters of hyperelastic materials used for production of elastomer tracks for industrial vehicles. Experiments were carried out with rubber test samples of the hardness close to the hardness of materials used for manufacture of rubber tracks, lining of the driving wheels and track rollers. These parameters were determined for models of hyperelastic materials (Mooney-Rivlin) used for calculations. The obtained results were comparedby numer ical calculations with the help of the finite element method with a model sample at identical load conditions for various models of a material including a material of linear properties (of the constant Young's modulus). Obtained results of studies and numerical analyses demonstrate only a limited potential of the use of linear models for hyperelastic materials - this use is possible only at small deformations. Obtained results of measurements and analyses can be used for proper modelling of parts made of elastomer materials.
Źródło:: Journal of KONES; 2010, 17, 1; 87-92
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Characteristic of vehicle suspension coil spring : comparison of experiment and finite element method simulation
Autorzy:: Cuber, D.
Gandyk, M.
Powiązania:: https://bibliotekanauki.pl/articles/243817.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: FEM
simulation
coil spring
vehicle suspension
Opis:: Coil springs do not always has regular geometry with constant pitch and constant mean diameter. Geometry of spring is more complex. Furthermore, spring stiffness could change with deflection. That makes calculation of spring stiffness more complicated than just putting four values into mathematical formula. In article has been presented two investigation methods of spring characteristic. Investigated object is a passenger vehicle suspension coil spring. Recognition spring characteristic is primary stage of vehicle dynamic suspension simulation. It has a very big impact on the vehicle height, comfort, handling and safety of vehicle. It is often assumed that vehicle spring has constant stiffness coefficient, which is sometimes a reason of incorrect suspension model. Vehicle springs rather has a progressive characteristic than linear. One of presented method is traditional, experimental compression test. Second, one is a measurement and modelling of spring geometry. Than analysing it in finite element method (FEM) simulation. Comparison has been done to check property of FEM process. Computed compression has been done in ABAQUS CAE 6.13-1 software. Analysis has shown that process of analysing is useful. There were obtained a good agreement between experimental research and computed model. In spite of irregular spring geometry, final characteristic is close to linear. Progressiveness is visible but not high.
Źródło:: Journal of KONES; 2015, 22, 4; 73-77
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: A finite element model development as a part of process of energy absorption material selection
Autorzy:: Jakubowski, R.
Skorupka, Z.
Powiązania:: https://bibliotekanauki.pl/articles/244612.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: RASTAS Spear
material
energy absorption
finite element model
LS-DYNA
Opis:: The Warsaw Institute of Aviation major role in the RASTAS Spear project was to design an energy absorption system for the space probe lander. As the system was meant to be unmanned, the main requirement was to use no active solutions like parachute or rocket propulsion (less complexity in application and thus more reliability). A group of various materials was chosen to be tested. Tests campaign was divided into three stages: static compression tests, low speed dynamic tests and high speed dynamic tests. The high-speed dynamic tests were divided into two substages. In the first one simple cube specimens were tested to obtain data necessary for second substage in which full-scale object was tested. Having valuable data from experiments, numerical simulations in LS-DYNA software were carried out and then the results were compared. Based on experimental data several iterations during finite element model developing process were made. That process allowed setting up properly simulation by changing and adjusting properties such: material models, contact types, element formulation and other important constants. The finite element simulation results showed a good correlation with experimental data. The knowledge gained from numerical model optimization in connection with experimental data allowed for creating faster and more accurate energy absorbing material selection methodology. This methodology was successfully used in subsequent projects in which Institute of Aviation took part and also can be used in other future applications.
Źródło:: Journal of KONES; 2016, 23, 3; 217-223
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Example of experimental validation and calibration of a finite element model of a heavy vehicle
Autorzy:: Szurgott, P.
Kwaśniewski, L.
Wekezer, J. W.
Powiązania:: https://bibliotekanauki.pl/articles/243839.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: numerical simulations
finite element analysis
heavy vehicles
validation
suspension systems
Opis:: An example of the experimental validation ofafinite element model of a selected heavy vehicle is presented in the paper. A truck tractor with a three axle single drop lowboy trailer and the total weight of 20 tons was selected as a representative for the tests. The major goal of the conducted studies was to develop a well validated the numerical model of a heavy vehicle applicable for computer simulation of dynamic interaction between a vehicle and a bridge or road structure. Therefore, only several components of the vehicle, affecting the vehicle-road interaction, like wheels and the suspension systems, were modelled in detail. The rest of components were simplified and considered as rigid bodies. The finite element model included fully pneumatic tires and the suspension system modelled with discrete massless springs and dampers. Numerical analyzes were performed using the LS-DYNA computer code. The validation and calibration procedure proposed in the current paper was carried out in two steps. In the first one, some parameters such as material densities, thickness of selected elements, were modified to achieve the correct mass distribution in the model based on the measured axle loads. In the next step the stiffness and damping parameters of the suspension system were evaluated based on the results of the experimental tests. The spring and damping coefflcients at all axles were adjusted until the performance of the FE model closely matched that of the actual vehicle.
Źródło:: Journal of KONES; 2010, 17, 1; 433-440
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Selected problems concerning the analysis of thin-walled structures with the use of finite element method
Autorzy:: Jachimowicz, J.
Mańkowski, J.
Osiński, J.
Powiązania:: https://bibliotekanauki.pl/articles/243328.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: diagonal tension
wing structures
thin-walled structures
aircraft
FEM
modelling
Opis:: The aim of the paper was presentation and comparison of numerical methods applied in thin-walled structures analysis, with special attention paid to possibility of usage the Finite Element Method (FEM), especially in nonlinear analysis. There were presented basic differences between classical approach to modelling and analyzing thin-walled structures, and these performed with FEM methods using. The biggest emphasis was placed on the analysis of semimonocoąues, in which the loss in the shell 's stability is possible in the range of operational load activity. According to this, many nonlinear terms like global and local buckling, contact problems, significant deformations and shifts, are present. Worth emphasizing is the fact, that tension field, is something that was described long time ago. First paper s about this phenomenon were published in the last century. Although it is a common effect that takes place in semimonocoques, there are not many publications that analyze and examine this phenomenon. In this paper, an analysis of two-sided, thin-walled spar, which has undergone the flexion by the shearing force in the plane of the panel, was presented. The spar was designed as a classic semimonocoque, in which load transmission function is separated. It was assumed that, for the sake of small thickness, shell elements transmit mainly tangential loads, normal loads, when normal loads are transmitted by framework elements. Riveted joints are used to join elements of framework and shell. There are presented and compared results of analysis for models with various complexities. Firstly, results of analysis of classical model of semimonocoques were presented. It means that framework elements were modelled as rod elements transmitted only normal loads, but shell elements were modelled as disc semimonocoque elements, in this case transmitted only tangential loads. Area of section of rod elements was adequately increased, in order to consideration mating width, coming from partial transmission of normal loads by the shell elements. Results obtained for intermediate models were also presented, as well as for complex shell model, which allows on advanced nonlinear analysis of tension field, which consider contact between framework and shell elements. Applications of formulated models to thin-walled structure, especially aircraft ones and further possibilities of presented method of analysis were discussed.
Źródło:: Journal of KONES; 2008, 15, 1; 109-118
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Application of finite element method in production of collar-head screw in suspension arm of motor car vehicle
Autorzy:: Świątoniowski, A.
Gregorczyk, R.
Rabiasz, S.
Powiązania:: https://bibliotekanauki.pl/articles/246223.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: motor-car suspension
cold forget process
collar-head screw
Opis:: The subject of analysis is the process of hex cap screws forming designed to fix suspension arm bushing in a motor car. Due to specified requirements set on elements of that type have to meet, both in the scope of size and shape accuracy as well as mechanic properties of material, cold forging closed-die process is applied. Analysis of such process including the application of Finite Element Method in the form of software package DEFORM-3D was conducted. Results of the analysis may help to choose the number and sequence of technological operations, their parameters and the proper shape of tools. The paper presents: suspension arm assembly, computer model presenting screw cold forging technology, work-hardening curve for AISI-1010 (ISO-C10) steel, boundary conditions of simulation, FEM model parameters in the subsequent phases of the process, analysis of accuracy of geometrical measures of screw obtained in simulations of particular phases of the process, discrete and actual model of obtained screw, the form of stained net of the hex cap screw with visible ZY central plane in its section, deformation distribution in screw head after second upsetting process, change in strain rate of the screw in time, filling of pass die, stress fields in screw determined in accordance with Huber's hypothesis, force of screw head upsetting in the function of the travel of the upper die.
Źródło:: Journal of KONES; 2011, 18, 3; 453-461
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: CAD based interaction of wing structures and aerodynamic loads using finite element model and transonic small disturbance model
Autorzy:: Zain, R.
Nurhadi, I.
Hadi, B. H.
Tjatra, W.
Powiązania:: https://bibliotekanauki.pl/articles/243253.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: multidisciplinary design
fluid structure interaction
CAD
transonic small disturbance
FEM
Opis:: A scheme has been developed to be utilized for solving the interaction between wing aerodynamic loads and the flexibility of wing structures under a quasi static assumption. The interaction is implemented through a link between the nodes of finite element model and the grids of transonic small disturbance model. The particular finite element responses, namely translational displacement vectors (TDV), are utilised for reconstructing the deflected wing surfaces. So in each iteration, the updated surfaces are involved as the parent for regenerating the TSD grids. The criteria of the Euclidean norm is applied for evaluating the convergency of aero-structure interaction. Catia-V5, is fully employed to manage three dimensional geometries for developing the model of wing structures, calculating grids and aerodynamic loads, as well as for reconstructing the updated wing surfaces. Numerous functions and objects of Catia are employed by conducting particular accesses via component object models using Microsoft Visual Basic.Net. A case study is excersized to demonstrate the interaction in transonic speed. The results shown that the scheme is very good in the way performing the interaction in quasi static condition. The utilization of TDV for generating the deflected wing surfaces indicates the capability of high fidelity deformations with respect to the complexity of finite element model.
Źródło:: Journal of KONES; 2013, 20, 2; 409-416
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Application of the finite element methods in long-term simulation of the multi physics systems with large transient response differences
Autorzy:: Wittbrodt, E.
Kahsin, M.
Powiązania:: https://bibliotekanauki.pl/articles/243299.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: dynamics
thermo elasticity
FEM
MBS
simulation
multi-physics systems
Opis:: Application of the Finite Element Method (FEM) and the Multibody Dynamics Method (MBS) allows analyzing of complex physical systems. Complexity of the system could be related both to the geometry and the physical description of phenomenon. MBS is the excellent tool for analyzing statics or dynamics of the mechanical systems. MBS permits tracking of Multi Body System transient response for the long-term simulations and application of any arbitrary set of mechanical forcing functions. However, this method does not allow observing state of the continuum systems. Besides, applying forcing functions other than mechanical ones (i.e. general forces or displacements) is troublesome in MBS. In case of FEM most of algorithms encounter continuity conditions across the element boundaries , and thanks to this FEMis one of the most suitable calculation method for continua multi-physics systems (i.e. thermo-structural, electro-thermo-structural, magneto-thermo-structural, MEMS, etc.). Common problem with FEM is that there are major calculation difficulties when long-term simulation results are required and/or large relative motions are present in the system. Drawbacks of FEM and MBS could be overcome with use of algorithm based on the modifled Hybrid Finite Element Method presented further in this paper. Traditional Hybrid Finite Element Method model consists of rigid end deformable elements, system matrices derived for all compound elements are calculated concurrently. In this approach both advantages and disadvantages of FEM and MBS are transferred to the model. Proposed modified Hybrid Finite Element Method algorithm exploits two corresponding coupled discrete models, one containing FEM elements and the other MBS only. Both models are coupled by means of forcing functions. Such approach is applicable for the multi-physics systems with large transient response differences.
Źródło:: Journal of KONES; 2008, 15, 1; 227-233
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Analysis of selected contact algorithms types in terms of their parameters selection
Autorzy:: Panowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/245114.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite element method
contact
penalty method
Opis:: The analysis of many engineering problems involves not only deformation of the considered system, but occurrence of the interaction between the individual separate elements of the system as well. The occurrence of friction is the most common phenomenon occurring during this interaction. In the case of intense friction, the heat released in this process is also important. In computer methods of mechanics, the process of interaction between bodies is carried out using special algorithms. The most frequently applied are: the penalty method, the barrier method, direct elimination of constraints, the Lagrange multiplier method, the perturbed Lagrangian method, the augmented Lagrangian method, Nitsche method. Owing to its easy implementation process, an approach based on a penalty function is often applied. In this approach, the contact between the bodies can be identified with the presence of the spring between the elements of the bodies in the contact. The stiffness of the spring depends on: material bulk modulus, face area, volume or shell diagonal and a numerically selected scale factor. The article will present the results of analyses that will allow fast and easy selection of its value. In the analyses there were presented the results considering the basic types of contacts: node to surface, surface to surface and surface to surface mortar.
Źródło:: Journal of KONES; 2013, 20, 1; 263-268
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Analysis of the influence of the finite elements mesh density on the determined shaped charge jet parameters
Autorzy:: Panowicz, R.
Konarzewski, M.
Borkowski, J.
Milewski, E.
Powiązania:: https://bibliotekanauki.pl/articles/244994.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: charge jet
finite element method
Euler method
Opis:: Article presents results of numerical analyses of the finite elements mesh density influence on the shaped charge jet stream formation process and its selected parameters. Authors considered classical shaped charge, which consists of the plastic explosive material, copper liner and aluminium case. To properly described, material properties of the liner and case of the shaped charge, the Johnson-Cook material model was used. Detonation process was described using burn model approach. Behaviour of the detonation process products was described by commonly used John-Wilkins-Lee equation of state. Due to the nature of the presented phenomenon, in which we are dealing with large strains and strain rates, for its modelling authors utilized Euler description, implemented in the LS-Dyna software. In these method material flows by the finite elements and mesh is not deformed. Such approach allows for modelling phenomena where large and very large deformations occur. Unfortunately, it can result in a destabilizing of the systems energy balance. In order to minimize dissipation processes, in calculations was used second order scheme because of the spatial variables and time. Analyses were performed in axially symmetric setup, which was possible due to the symmetry of the analysed system. Influence of the finite elements size on the process of jet stream formation and its selected parameters was analysed.
Źródło:: Journal of KONES; 2015, 22, 3; 329-335
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Numerical analyses of the V-shaped deflector effectiveness
Autorzy:: Panowicz, R.
Konarzewski, M.
Trypolin, M.
Powiązania:: https://bibliotekanauki.pl/articles/244346.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ballistic pendulum
dynamics
finite element method
ConWep
Opis:: One of the most effective ways to protect mobile objects from the effects of the pressure wave originating from the detonation of a landmine or an explosive charge is to use a special design of the bottom of the protected vehicle. Such structure, called the deflector, in most cases has the shape of the V letter. Article presents the study of effectiveness of the V-shaped deflector. Authors prepared numerical model of a ballistic pendulum consisting of the 1 meter long HEB220 H-beam, suspended using four parallel steel ropes. In the front part of the beam, deflector was mounted. The test component was loaded with pressure wave coming from the detonation of an explosive charge. The article presents an analysis of the ability of the deflector to disperse and/or absorption of energy, depending on the type of the used explosive material and its mass. Studies have been done on the basis of numerical analysis performed with use of the finite element method with explicit integration over time scheme, implemented in the LS-Dyna software. For generation of the pressure wave originating from the detonation of explosive charge ConWep algorithm was used. It uses the predefined by the user geometric and mass parameters, and TNT equivalent to the generation of a pressure pulses.
Źródło:: Journal of KONES; 2016, 23, 2; 269-274
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Numerical analysis of residual stress distribution in riveted lap joint under tension
Autorzy:: Wronicz, W.
Powiązania:: https://bibliotekanauki.pl/articles/245195.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: joint
rivet
fatigue
residual stress
finite element
Opis:: Riveted joints are a common location of fatigue cracks in aircraft metal structures. Fatigue life of such joints as well as a place of cracks nucleation is strongly influence by a stress distribution in sheets, which is a result of residual stresses (mainly after riveting) and stresses induced by external loads. Stress distribution in two-row lap joint was investigated with the use of Finite Element Method. The joint consist of two 1.5 mm sheets and two protruding rivets with diameter equal to 4 mm, made of 2024 T3 (sheets) and 2117 T4 (rivets) aluminium alloys. The simulations covered a riveting process and tensile stages. The 3D models of joint with the universal rivets and with the brazier, rivets with a compensator were prepared. Elastoplastic material properties as well as geometric nonlinearity and contact phenomena were included. The results of simulations show that the residual stress distribution after release of tensile loading varies significantly from the distribution after riveting only. This fact should therefore be taken into account in a fatigue life estimation of such joints performed based on a FE calculation. The paper presents also the influence of the analysed rivet geometry on the stress distribution at the sheets faying surfaces.
Źródło:: Journal of KONES; 2018, 25, 4; 455-462
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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