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Analiza numeryczna i doświadczalna pracy ściskanych elementów cienkościennych z wydrążonymi otworami

Różyło P., Wrzesińska K.

Przegląd Mechaniczny

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2016

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nr 7

29--34

PL

Przedmiotem badań są cienkościenne elementy stalowe w postaci dwuteowników ażurowych o zmiennych parametrach geometrycznych szeregu otworów. Próbki zamodelowane numerycznie, zostały poddane procesowi osiowego ściskania, podczas którego badano stan krytyczny oraz pokrytyczny profili cienkościennych w odniesieniu do badań doświadczalnych. Modele podparto przegubowo na krawędziach stanowiących przekrój poprzeczny badanych profili w górnej i dolnej części elementów. Badania numeryczne wykonywano wyłącznie w zakresie nieliniowej stateczności konstrukcji. Analizę MES prowadzono do chwili osiągnięcia przez poddane ściskaniu profile granicy plastyczności materiału - w celu otrzymania stanu utraty stateczności struktur, bez następstwa związanego z niepożądanym uplastycznieniem. Do obliczeń numerycznych wykorzystano program ABAQUS®, dzięki któremu prowadzono badania związane z wpływem zmienności średnic szeregu otworów profili cienkościennych, w zakresie dopuszczalnych obciążeń eksploatacyjnych struktur. Badania numeryczne realizowano jedynie w zakresie pracy sprężystej, pozwalającej na stateczną pracę cienkościennej konstrukcji.

EN

The specimens are thin-walled steel elements in the form of openwork beams with variable geometrical parameters row of holes. Samples were modeled numerically and additionally undergone axial compression, in which critical and after-critical conditions of designed thin-walled profiles were studied according to experimental research. Models properly propped articulated on the edges of cross-section examined profiles of the upper and Iower parts. Numerical investigations were carried out exclusively in the field of non-linear stability of the structure. FEM analysis was carried out until achieving yield stress of the material - in order to obtain the State of loss of stability of structures, without effects resulting from the undesirable plastic deformation. For the numerical calculations used ABAOUS® program, through which conducted research related to the impact of variability diameter thin-walled profiles a series of holes, to the extent allowable loads the operating structures. Numerical investigations carried out work only to the extent elastic, allowing the stately work of thin-walled structures.

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Numerical Analysis of Buckling and Critical Forces in a Closed Section Composite Profile

Różyło P., Wrzesińska K.

Applied Computer Science

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2016

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Vol. 12, no 2

54--62

EN

This paper reports the results of a numerical analysis of buckling in a carbon-fibre reinforced plastic (CFRP). The analysis involved determination of the first buckling mode and critical forces for the tested composite. The composite was tested for six different ply orientations. The analysis was performed on a closed section composite column. The objective of the analysis was to determine critical forces affecting the composite profiles with the applied ply orientations and, thus,to determine the laminate ply orientations which can carry the heaviest loads. The numerical modelling and all computations were performed using the Abaqus 6.14 software. In the analysis, we took account of boundary conditions and performed a discretization process in order to obtain correct results.

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Numerical Analysis of an Aluminium Profile under Bending using Abaqus And Deform-3D

Różyło P., Wójcik Ł., Wrzesińska K.

Applied Computer Science

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2016

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Vol. 12, no 1

40--47

EN

The paper describes the process of symmetric bending of an aluminium specimen using two independent environments for numerical analysis. A FEM analysis is performed on an aluminium channel section. A comparison is made between the bending process performed in the Abaqus environment and that run with the Deform-3D system. In both numerical analysis systems, the crucial point is to determine the state of reduced stresses for a designed computer model. The paper provides a visual comparison of the profiles subjected to bending; it also determines displacements and stresses in the tested structures. To perform a nonlinear static analysis, we define a material model, determine boundary conditions, interactions as well as generate a mesh. The results produced with the two numerical systems agree to a very high extent.

4

Numerical analysis of the behavior of compressed thin-walled elements with holes

Różyło P., Wrzesińska K.

Advances in Science and Technology. Research Journal

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2016

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Vol. 10, nr 31

199--206

EN

The study investigates thin-walled steel elements in a form of openwork beams with holes described by variable geometrical parameters. The specimens are modeled numerically and additionally subjected to axial compression in order to examine the critical and post-critical behavior of the thin-walled profiles. The models of profiles are propped articulatedly on the edges of the cross-section in the upper and lower parts. The numerical analysis investigates only the problem of non-linear stability of these structures. The FEM analysis is stopped at the moment when the compressed profiles achieve the yield stress in order to determine their loss of stability without undesired strains. The numerical computations are performed using the ABAQUS® program to investigate the impact of diameter variability in the thin-walled profiles with holes under allowable operational loads. The numerical investigation was performed only with respect to elastic work, ensuring the stability of thin-walled structures.