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Experimental and numerical investigations of ultimate strength of imperfect stiffened plates of different slenderness

Woloszyk Krzysztof, Garbatov Yordan, Kowalski Jakub, Samson Leszek

Polish Maritime Research

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2020

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nr 4

120--129

EN

The objective of this study is to analyse the behaviour of compressed stiffened plates of different slenderness using experimental and numerical methods. The presented results are part of a long-term project to investigate the ultimate strength of geometrically imperfect structures subjected to different degradation phenomena, including corrosion degradation and locked cracks. Several specimens were subjected to a uniaxial compressive force, and the most important quantities related to the structural behaviour were captured and analysed. A finite element model, accounting for material and geometrical nonlinearities and initial geometrical imperfections, was developed using the commercial software ANSYS. The residual welding-induced stresses were measured in the middle cross-section for two specimens. The initial imperfection was identified by employing a close-range photogrammetry approach. It was concluded that the numerical analyses, based on the finite element model, predict the ultimate strength of stiffened plates accurately, although some deviations were also observed. The detailed analysis with the indication of possible uncertainty is presented, and several conclusions are derived.

2

Analiza MES płyty prostokątnej usztywnionej profilami zamkniętymi

Dębski H., Jonak J.

Górnictwo Odkrywkowe

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2006

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R. 48, nr 5-6

122-125

PL

Rozważa się stateczność oraz stan deformacji zakrytycznej prostokątnej płyty cienkiej usztywnionej profilami zamkniętymi, poddanej działaniu obciążenia stycznego. Badania obejmowały obliczenia teoretyczne oraz analizę numeryczną konstrukcji z wykorzystaniem metody elementów skończonych. Równolegle do wykonywanych obliczeń przeprowadzono badania eksperymentalne konstrukcji, stanowiące formę bieżącej weryfikacji modelu MES.

EN

This paper presents buckling and postbuckling deformation state of rectangular plate which are stiffened closed profiles. Researches connected theoretical calculations and numerical FEM analysis of this construction. In order verification of numerical model experimental tests were carried out.

3

Application of genetic algorithms to the evaluation of the fundamental frequency of stiffened plates

Iwaniec M.

Archives of Acoustics

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2006

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Vol. 31, No. 3

335-346

EN

In this paper, the analytical and numerical procedures for multi-stiffened plate free vibration analysis are presented. The plate and stiffeners are treated as an assembled plate and stiffening elements. The energy analysis leads to the nonlinear formulation of the non-dimensional frequency function formulated for a group of similar palates. The generalized optimization problem was solved by the use of the Nelder-Mead and genetic algorithms. The verification of the results obtained was performed on FEM models created for the same examples of the physical representation of the considered group of stiffened plates. This paper also aims the study of the influence of geometrical and material parameters of the stiffeners as well as the plate proportions on the fundamental frequency.

4

The influence of constructional parameters on stiffened plates sound radiation

Iwaniec M.

Archives of Acoustics

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2005

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Vol. 30, No. 4

483-494

EN

This work concerns the method of the plate parameter selection and the choice of the stiffening set, assuming the minimization or maximization of the energy stored or radiated by a stiffened plate as a criterion. The energy balance equations based on the SEA method were used in order to quickly evaluate the energy flow as a function of chosen constructional parameters. Calculations of mechano-acoustic energy flow were performed in AutoSEA and Matlab environment.