Autor: Mańkowski, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Digital materials – evaluation of the possibilities of using selected hyperelastic models to describe constitutive relations
Autorzy:: Mańkowski, J.
Lipnicki, J.
Powiązania:: https://bibliotekanauki.pl/articles/265437.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: digital materials
hyperelastic
identification of models
FEM
3D printing
PolyJet Matrix technology
materiały cyfrowe
drukarka 3D
modelowanie numeryczne
Opis:: The authors tried to identify the parameters of numerical models of digital materials, which are a kind of composite resulting from the manufacture of the product in 3D printers. With the arrangement of several heads of the printer, the new material can result from mixing of materials with radically different properties, during the process of producing single layer of the product. The new material has properties dependent on the base materials properties and their proportions. Digital materials tensile characteristics are often non-linear and qualify to be described by hyperelastic materials models. The identification was conducted based on the results of tensile tests models, its various degrees coefficients of the polynomials to various degrees coefficients of the polynomials. The Drucker’s stability criterion was also examined. Fourteen different materials were analyzed.
Źródło:: International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 601-612
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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: 3.

Tytuł:: Proposal for the method of determining the most intensive fragments rivet joins appearing the shell air panels working under the influence of tension field
Propozycja metody wyznaczania najbardziej wytężonych fragmentów szwów nitowych występujących w cienkościennych panelach lotniczych pracujących pod wpływem pola ciągnień
Autorzy:: Mańkowski, J.
Osiński, J.
Rumianek, P.
Jachimowicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/327500.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: konstrukcja cienkościenna
półskorupowe połączenie nitowe
pole ciągnień
MES (metoda elementów skończonych)
shell structures
semi-monocoque structures
riveted joints
tension field
FEM
Opis:: This article presents the methodology for determining seam rivet fragments most exposed to fatigue damage caused by buckling cover sheet occurring in the semi-monocoque structures. The present study is focused on determining the impact of the tension field, which is one of the cases of buckling, the state of the burden and strain of riveted joints occurring in shell structures. The conditions in which tension field arise for example two-flange girder were also examined. Analysis was also performed to explore micro-slides between the rivet and the hole in the conditions of normal and torsional loads of combined sheets. The presented method allows both the determination of dangerous places, susceptible to the tension field for the whole structure, as well as a detailed analysis of selected parts of the structure - which can be useful, especially in the design of structures on the basis of supervising durability.
Celem artykułu jest przedstawienie metodyki określania najbardziej narażonych na zniszczenie zmęczeniowe, spowodowane wybaczaniem blach pokrycia, fragmentów szwów nitowych występujących w konstrukcjach półskorupowych. W niniejszej pracy skupiono się na określeniu wpływu pola ciągnień, które jest jednym z przypadków wyboczenia, na stan obciążeń i odkształceń połączeń nitowych występujących w konstrukcjach cienkościennych. Zbadano warunki powstawania pola ciągnień na przykładzie dźwigara dwupasowego. Wykonano również analizy mające na celu zbadanie mikropoślizgów pomiędzy nitem a otworem w warunkach obciążeń normalnych i skrętnych łączonych blach. Przedstawiona w pracy metoda, pozwala zarówno na określenie miejsc niebezpiecznych, podatnych na działanie pola ciągnień, dla całej konstrukcji; jak i przeprowadzenie szczegółowej analizy wybranych fragmentów konstrukcji - co może być przydatne, zwłaszcza przy projektowaniu konstrukcji na trwałość dozorowaną.
Źródło:: Diagnostyka; 2010, 3(55); 55-62
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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