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1
Content available remote Wpływ luzów geometrycznych na stan naprężenia w otoczeniu nitu grzybkowego
Sławiński G., Szymczyk E., Niezgoda T., Jachimowicz J.
Górnictwo Odkrywkowe
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2010
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R. 51, nr 3
29-32
PL
W artykuleprzedstawiono wyniki symulacji numerycznych dotyczących wpływu wybranych imperfekcji geometrycznych naprężenia w otoczeniu nitu. W trakcie spęczania nitu do łączonych blach wprowadzane są naprężenia własne, których przekracza granicę plastyczności. Zjawisko to wpływa na poprawę trwałości zmęczeniowej połączenia. Jednak można się spodziewać, że niedokładności wykonania mogą wpłynąć na pogorszenie wytrzymałości połączenia nitowego.
EN
This paper deals with the numerical FE simulation of the geometrical imperfections influence on the residual stress fields around the rived hole. The residual stress state occurs in the rivet hole after the riveting process exceeds the yieldstress level. It has significant influence on the fatigue life improvement of aircraft structures, however, some geometrical imperfections can reduce the strength of the riveted joint.
2
Content available Modele globalne i lokalne MES w analizie struktur lotniczych na przykładzie fragmentu skrzydła samolotu PZL M28 Skytruck
Jachimowicz J., Szymczyk E., Sławiński G., Derewońko A., Wronicz W.
Biuletyn Wojskowej Akademii Technicznej
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2010
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Vol. 59, nr 1
35-59
PL
W niniejszym artykule na wstępie przedstawiono globalne analizy statyczne MES struktury fragmentu skrzydła samolotu PZL M28 Skytruck. W dalszej części pracy zamieszczono kolejno modele lokalne o różnym stopniu szczegółowości, umożliwiające analizy MES obszarów konstrukcji skrzydła z uwzględnieniem połączeń nitowych, analizy poszczególnych szwów nitowych, a w końcu analizy pojedynczych nitów. Omawiane modele lokalne poza warunkami brzegowymi wynikającymi z modeli globalnych i obciążeniami ogólnymi samolotu uwzględniają wybrane czynniki materiałowe i technologiczne oraz ich wpływ na stan przemieszczeń i naprężeń wokół nitu. Na końcu artykułu przedstawiono symulację procesu nitowania nitu grzybkowego w wyniku której uzyskano rozkład naprężeń resztkowych wokół nitu.W analizach wykorzystano systemy MSC Nastran, Marc i Ansys, a zakres analiz obejmował materiały sprężysto-plastyczne oraz sformułowania dużych przemieszczeń i odkształceń, a także wielopłaszczyznowy kontakt powierzchniowy.
EN
The paper deals with the analysis of residual stress and strain fields in a riveted joint. This stage of study concerns improving 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 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 rivet joints, which are used to build it. Global and local numerical models of the joint are considered with regard to the aim introduced in the paper. Numerical FE simulations of upsetting process are carried out using the NASTRAN and MARC 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 a problem requires the use of contact between the elements assembled and non-linear geometric and elasto-plastic multilinear material models to simulate behaviour of the rivet and sheets. The influence of the squeezing force on strain and stress states is studied. A certain solution to the problem connected with non-uniform stress distribution in the rivet hole is proposed and analysed.
3
Content available Comparison of the dynamic riveting process of a rivet with and without a compensator
Szymczyk E., Slawinski G., Jachimowicz J., Derewonko A.
Journal of KONES
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2009
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Vol. 16, No. 4
455-462
EN
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.
4
Content available Comparison of the dynamic riveting process of a rivet with and without a compensator
Szymczyk E., Slawinski G., Jachimowicz J., Derewonko A.
Journal of KONES
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2009
|
Vol. 16, No. 3
415-422
EN
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.
5
Content available Riveting process simulation - upsetting of the mushroom rivet
Szymczyk E., Jachimowicz J., Sławiński G.
Journal of KONES
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2008
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Vol. 15, No. 2
493-502
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