Autor: Szymczyk, E. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The influence of residual stress fields and sheet thickness on stress distributions in riveted joint
Autorzy:: Szymczyk, E.
Powiązania:: https://bibliotekanauki.pl/articles/243841.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: riveted joint
residual stresses
secondary bending
FEM
Opis:: Riveting is a traditional, but still popular (particularly in aviation) method of joining metal and composite elements. The residual stress and plastic strain states occur in the joint after the riveting process. The total stress aperienced by the material at a given location within a component depends on the residual and applied stress. Residual post-riveting stress fields are widely accepted to have a significant influence on the fatigue life of aircraft structures. The single lap riveted joint consisting of two sheets and three rows of rivets are analysed. Two specimens are taken into consideration: sheet width and pitch distance are equal to 10.5 mm and rivet diameter is equal to 3.5 mm in the former case whereas 25 mm wide sheets and 5 mm rivet diameter are used in the later case. Distance between rivets (pitch length) and sheet width are equal to 3 or 5 rivet diameters. Materials used in riveted joints are subjected to plastic deformation. The rivet (PA24) and the sheet (2024T3) aluminium alloys are described using piecewise linear material models. The yield stress for the multiaxial state is calculated using the von Mises yield criterion. The paper deals with analysis of the pitch length and sheet thickness influence on stress fields. Stress concentrations around the holes in the rivet row and its distribution between rows are calculated. Models with and without residual stresses are taken into consideration. Local change of the sheet thickness causes a decrease in secondary bending of the joint. This is a result of a small increase in bending between the rivet rows and a simultaneous decrease in maximum bending stress values.
Źródło:: Journal of KONES; 2010, 17, 1; 441-448
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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: 3.

Tytuł:: Numerical analysis of the riveted specimen
Analiza numeryczna próbki nitowej
Autorzy:: Szymczyk, E.
Sławiński, G.
Powiązania:: https://bibliotekanauki.pl/articles/243091.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: połączenia nitowe
MES (metoda elementów skończonych)
analiza globalna
model powłokowo-belkowy
riveted joint
FEM
global analysis
shell-beam model
Opis:: Połączenia nitowe są krytycznymi obszarami w konstrukcji lotniczej, ze względu na występowanie wtórnego zginania, koncentracji naprężeń oraz odkształceń plastycznych. Analiza konstrukcji lotniczych, w tym połączeń nitowych wymaga zastosowania lokalno-globalnego podejścia do modelowania numerycznego. W artykule przedstawiono analizę powłokowo-belkowego modelu połączenia zakładkowego złożonego z dwóch blach aluminiowych połączonych sześcioma nitami. Do opisu nitów zastosowano elementy belkowe. Uwzględniono zjawisko kontaktu oraz tarcie pomiędzy współpracującymi częściami. Analizę numeryczną zrealizowano w zakresie sprężysto-plastycznym. W modelu materiału przyjęto nieliniową charakterystykę opisującą stop aluminium. Analizowano wpływ geometrii i warunków brzegowych na pola naprężeń i odkształceń w próbce nitowanej. Badano rozkład naprężeń w przekroju poprzecznym próbki, odkształcenia plastyczne wokół otworu oraz rozwój pola odkształceń plastycznych w trakcie próby statycznego rozciągania. Wyniki symulacji dla analizowanego złącza zakładkowego porównano z wynikami analizy rozciąganej próbki z otworem swobodnym. Model do obliczeń wygenerowano w programie PATRAN. Obliczenia wykonano przy pomocy programów MD NASTRAN oraz MSC.MARC.
The riveted joints are critical places in the aircraft structure with regard to secondary bending, stress concentrations and plastic strain. Analysis of aircraft structures, in it riveted joints requires a local-global approach to numerical modelling. The shell-beam model of the riveted lap joint consisting of two aluminium sheet with six rivets is presented. The rivet is described as a beam element. The contact with friction is defined between the collaborating parts of the joint. Numerical calculation is carried out in elastic-plastic range. The nonlinear stress-strain curve, describing material model of aluminium alloy, is taken into consideration. The influence of the specimen geometry and boundary conditions on strain and stress fields in the riveted joint is studied. Stress distribution in the crosswise sections of the specimen, plastic deformations around a rivet hole and evolution of plastic strain fields during tensile loading are analysed. The results of simulation of tensile loaded lap riveted joint are compared with the results for specimen with open hole. The finite element models are made with Patran. The calculations are preformed using NASTRAN and MARC codes.
Źródło:: Journal of KONES; 2007, 14, 2; 475-484
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: About mechanical joints design in metal - composite structure
Autorzy:: Puchała, K.
Szymczyk, E.
Jachimowicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/246795.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: mechanical joint
adhesive joint
FEA
aviation
Opis:: Riveting is still one of the main joining methods of thin-walled aircraft structures. Such features as simplicity of implementation, possibility of two different material connection (e.g. metallic with non-metallic ones) and the fact that is it a well-known (reliable) method causes popularity of riveting. The never-ending attempt to obtain as low mass as possible (mainly to reduce fuel consumption) is the reason for using material of high specific strength in the aerospace industry. High strength titanium or aluminium alloys (e.g. 2024T3) and composite laminates (e.g. CFRP or Glare) are examples of such materials. The article deals with methods of connecting various materials. The paper presents advantages and disadvantages of different/selected connection types. Strength prediction and failure modes of mechanical joints are described for metallic as well as for composite components. Composites are complex materials having an anisotropic structure (and anisotropic mechanical properties) leading to various failure mechanisms. Main principles for appropriate joint design of composite laminate panels (laminate configuration and typical/specific geometrical dimensions) are indicated/specified. The bearing failure mechanism is accepted to be a safe progressive one. Mechanism of bearing (generally compressive) load transfer into composite laminates by shear of the matrix is analysed. Some examples of improvement bearing strength of laminates are presented according to literature. On the base of presented examples and bearing load transfer analysis, some conclusions for an appropriate solution of this problem are drawn.
Źródło:: Journal of KONES; 2012, 19, 3; 381-390
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Friction coefficient determination based on the results of ball – on - flat test
Autorzy:: Szymczyk, E.
Jachimowicz, J.
Prasek, Ł.
Powiązania:: https://bibliotekanauki.pl/articles/248003.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: friction coefficient
ball-on-flat test
FFT
Opis:: The interaction of contacting surfaces in relative motion is basic for every engineering design. The transmission of load from one rubbing surface to its mating surface under conditions of dry contact is taken into account. Microlocal or global models of friction are used to describe this phenomenon. In global approach, frictional force is proportional to normal load. A coefficient of external friction depends on the type, shape, and precision of finishing the surfaces of mating elements. The aim of the paper is analysis of a friction coefficient for 2024T3 aluminium alloy during cyclic tangential loading. Experimental tests are carried out on a ball-on-flat wear-testing machine Ducom. Tests of reciprocating friction are carried out using the following friction pairs of specimens: the ball specimen is made of high strength aluminium alloy PA25 and the plane specimen is made of 2024T3 alloy. Finally, graphs of temporary friction coefficients versus time in the form of fluctuated periodical functions are obtained. Two phases of friction are detected. However, during the first stage, the friction coefficient is relatively small while in the second period it rapidly increases and tends to become more irregular. Static and dynamic friction coefficients are estimated. In order to determine the dynamic coefficient the Discrete Fourier Transformation is used. The calculation of the dominant amplitude (corresponding to test frequency) of the studied functions is possible due to this method. An increase of the friction coefficient with an increase of normal load is observed. A cladding layer also causes an increase of friction, especially in the second phase.
Źródło:: Journal of KONES; 2012, 19, 1; 415-422
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Analysis of residual stress fields in the riveted joint
Autorzy:: Szymczyk, E.
Jachimowicz, J.
Derewońko, A.
Powiązania:: https://bibliotekanauki.pl/articles/243089.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: riveted joint
FEM local model
non-destructive testing methods
Opis:: The riveted joints are critical areas of the aircraft structure. The residual stress and strain state appears at the rivet hole after the riveting process and improves fatigue behaviour of the joint. Numerical FE simulations of the upsetting process are carried out using the MARC code. Three-dimensional numerical models are used to determine the resulting stress and strain fields at the countersunk rivet and around the hole. The contact with friction is defined between the mating parts of the joint. Calculations are carried out in an elastic-plastic range. The influence of the rivet geometry, rivet stiffness and the sheet material model on strain and stress states is studied. Non-destructive testing methods like X-ray diffraction, liquid penetrant inspection and visual detection analysis with a UV lamp are used for validation of numerical results. Comparison between numerical and experimental results gives a satisfactory agreement. Numerical simulations allow investigating the influence of imperfections on the strength of the joint.
Źródło:: Journal of KONES; 2007, 14, 2; 465-473
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Some aspects of dynamic riveting simulations
Autorzy:: Szymczyk, E.
Jachimowicz, J.
Puchała, K.
Powiązania:: https://bibliotekanauki.pl/articles/248006.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: riveting
dynamic simulation
residual stress state
Opis:: Riveting is a commonly used (especially in aircraft structures) method of joining metal and composite components. The methods of forming solid shank rivets can be classified in two types: static and dynamic. The static method is the most efficient one. Regrettably, its application is limited. A popular upsetting tool used in an aircraft is a pneumatic riveter. The rivet driving requires a few hammer strokes. The total stress in a riveted joint depends on the residual and applied stress. Residual post-riveting stress fields are widely accepted to have a beneficial influence on the fatigue life of aircraft structures. The analysis is carried out for a solid mushroom rivet (made of PA25 alloy) joining two sheets (made of 2024T3 alloy). Nonlinear dynamic simulations of the upsetting process are carried out. Simulation of the riveting process is significantly influenced by a material model. The numerical calculations are performed for three different cases of upsetting described by the formed rivet head diameters 1.4d, 1.5d and 1.6d, respectively. The rivet head diameter and, consequently, the residual stress state depend on hammer stroke energy. It has a significant influence on a plastic region around the rivet hole, whereas the influence of a number of strokes can be neglected. The strain rate in both local and global (average) formulation is analysed in the paper. For one hammer stroke, the global strain rate of the rivet shank is about 1.0 thousand per second. The local strain rate is about two times greater than the global one, so a strain rate factor has an effect on the residual stress state. For a few hammer strokes, the strain rate is lower than for one stroke; however, it increases a little in each stroke. The hole deformation can be treated as a function of the internal energy of the sheet. The lower total energy of the part the greater influence of the strain rate on the internal energy is observed.
Źródło:: Journal of KONES; 2012, 19, 1; 423-430
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Riveting process simulation - upsetting of the mushroom rivet
Autorzy:: Szymczyk, E.
Jachimowicz, J.
Sławiński, G.
Powiązania:: https://bibliotekanauki.pl/articles/244023.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: riveted joint
mushroom rivet
FEM local model
stress and strain fields
Źródło:: Journal of KONES; 2008, 15, 2; 493-502
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Comparison of the dynamic riveting process of a rivet with and without a compensator
Autorzy:: Szymczyk, E.
Slawinski, G.
Jachimowicz, J.
Derewonko, A.
Powiązania:: https://bibliotekanauki.pl/articles/245374.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: riveted joint
mushroom rivet
FEM local model
deformation fields
Opis:: The paper deals with the analysis of deformation of a rivet hole in a riveted joint after the manual dynamic riveting process. For many years, riveting remains a traditional and the most popular method ofjoining in aircraft structures. The residual stress and strain state appear at the rivet hole after the riveting process, which improves the joint's fatigue behaviour. The local finite element models are made with Patran. The rivet and sheets are described using eight-noded, three-dimensional brick elements. The riveting tools consist of four-noded, two-dimensional shell elements. Numerical FE simulations of the upsetting process are carried out using the Ls-Dyna code. The contact with friction is defined between the collaborating parts of the specimen. The results of simulations of the dynamic riveting process of a mushroom rivet with and without a compensator are compared in this paper. Hole deformation of the upper and lower sheet, squeezing force, as well as deformations of the rivet head are analysed. The influence of the compensator on strain and displacement states is studied. Simulation shows that some technological factors may have positive influence on the residual stress fields. Using the rivet with a compensator results in a better rivet hole filling capability. The rivet hole displacement in upper and lower sheets are at the same level. Paper also present manual dynamic riveting process of reverse and standard riveting procedure and model of riveted specimen.
Źródło:: Journal of KONES; 2009, 16, 4; 455-462
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Comparison of the dynamic riveting process of a rivet with and without a compensator
Autorzy:: Szymczyk, E.
Slawinski, G.
Jachimowicz, J.
Derewonko, A.
Powiązania:: https://bibliotekanauki.pl/articles/245575.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: riveted joint
mushroom rivet
FEM local model
deformation fields
Opis:: The paper deals with the analysis of deformation of a rivet hole in a riveted joint after the manual dynamic riveting process. For many years, riveting remains a traditional and the most popular method of joining in aircraft structures. The residual stress and strain state appear at the rivet hole after the riveting process, which improves the joint's fatigue behaviour. The local finite element models are made with Patron. The rivet and sheets are described using eight-noded, three-dimensional brick elements. The riveting tools consist of four-noded, two-dimensional shell elements. Numerical FE simulations of the upsetting process are carried out using the Ls-Dyna code. The contact with friction is defined between the collaborating parts of the specimen. The results of simulations of the dynamic riveting process of a mushroom rivet with and without a compensator are compared in this paper. Hole deformation of the upper and lower sheet, squeezing force, as well as deformations of the rivet head are analysed. The influence of the compensator on strain and displacement states is studied. Simulation shows that some technological factors may have positive influence on the residual stress fields. Using the rivet with a compensator results in a better rivet hole filling capability. The rivet hole displacement in upper and lower sheets are at the same level. Paper also present manual dynamic riveting process ofreverse and standard riveting procedure and model of riveted specimen.
Źródło:: Journal of KONES; 2009, 16, 3; 415-422
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Numerical study of the influence of shape imperfections on residual stress fields in a rivet hole
Autorzy:: Sławiński, G.
Niezgoda, T.
Szymczyk, E.
Jachimowicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/246398.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: FEM
riveted joints
imperfections
residual stress
Opis:: The paper deals with the numerical analysis on residua! stress and strain fields in a rivet hole. This stage of study concerns improving of the fatigue performance of riveted joints in an airframe. Riveting, particularly in aviation, is a traditional but still commonly used method of joining sheet metal components. Aircraft structures are thin-walled ones, with coverings made of thin sheets stiffened by stringers, frames or ribs. Sheets are typically assembled by a multiple rivet or bolt joints. Rivets and bolts are also used to joint sheets and stiffeners. Therefore, fatigue resistance of the aircraft structure depends on tens of thousands or even hundreds of thousands r ivet joints, which are used to build it. The local numerical models of the joint are considered with regard to the aim introduced in the paper. Numerical FE simulations of an upsetting process are carried out using the LS-DYNA code. Three-dimensional numerical models are used to determine the resulting stress and strain fields at the mushroom rivet and around the hole. This type of problem requires the use of contact between the elements assembled and non-linear geometrie and elasto-plastic multilinear materiał models to simulate the behaviour of the rivet and sheets. The influence of shape imperfection on strain and stress states is studied.
Źródło:: Journal of KONES; 2010, 17, 2; 427-434
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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