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Numerical and experimental analysis of stability of thin-walled composite structures subjected to eccentric load

Debski Hubert

Archives of Civil and Mechanical Engineering

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2019

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Vol. 19, no. 3

792--802

EN

The study investigates the effect of eccentric load on the stability and post-critical states of thin-walled composite top-hat cross-section columns made of CFRP under compression. The specimens were subjected to compressive load on the universal testing machine Zwick Z100 with regard to both axial and eccentric compressive loads. On the basis of the experimental studies, numerical models of thin-walled composite profiles were designed and verified by numerical analysis based on the FEM. The first stage of the conducted studies was performing a linear buckling analysis of stability of composite structures. The second stage of the analysis involved performing a nonlinear analysis of the thin-walled structures with geometric imperfections reflecting the lowest buckling modes. The obtained test results showed various effects of non-axial compressive load on the critical load values and stiffness of the con- struction in the post-critical state. In the case of eccentric loading in the direction parallel to the web of the top-hat profiles, the critical load values practically did not change – a drop in the force did not exceed 1.5%, as well as there was no change in the stiffness of the structure in the post-critical state. The realization of the eccentricity in the direction perpendicular to the profile web caused a drop in the critical force equal 43% and a significant decrease in the stiffness of the structure. On the other hand, implementation of the eccentricity load toward the web caused an increase in the critical force by more than 20%, despite very small eccentricity values of only 4 mm were applied. This proved high sensitivity of the tested structures to the non-axial load in the direction perpendicular to the web of the profile. The FEM results and the experimental findings showed satisfactory agreement.

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Rozwój systemów zarządzania produkcją

Moczała A.

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2007

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z. 42

125-133

PL

W artykule przedstawiono problem ewolucji systemów ERP i przepływu danych w kooperacji procesów produkcji. Rozwój produktywności potrzebuje ułatwienia inicjowania, tworzenia i powiększania kooperacyjnycli powiązań, co wymaga rozwoju systemów inżynierii zarządzania. Rozwój systemów ERP stwarza możliwości wyszukiwania przedsiębiorstw, posiadających wolne zasoby. Proponowana ewolucja systemów wspomaga tworzenie procesów produkcyjnych z innymi przedsiębiorstwami.

EN

The paper presents problem evolution of ERP systems and data flow in the co-operation of production process. The development of productivity demands facilitation of initiation, formation and enlarging the cooperation connections. This problem demands development of systems in management engineering. This development of systems ERP demands possibility of looking enteprises which have free resources. The proposed evolution of systems makes support for creating production process with other cooperating enterprises.

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Informatyczne systemy zarządzania produkcją w ujęciu obiektowym

Bojarski R.

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2006

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z. 35

31-41

PL

Artykuł omawia podstawowe bloki konstrukcyjne języka UML (ang. Unified Modeling Language) i ich przydatność w modelowaniu systemów informatycznych zarządzania przedsiębiorstw wytwórczych. Na bazie przykładów, reprezentujących wybrane fragmenty systemu, zilustrowano i omówiono aspekty statyczne oraz dynamiczne zaprezentowanych modeli.

EN

The paper describes basic elements of UML (Unified Modeling Language) and their usefulness in modelling of IT management systems designed for manufacturing organisations. A number of examples representing models of the fragmented system have been presented and their static and dynamic aspects have been outlined.