SVIBOR - Project code: 2-08-305


Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69


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Project code: 2-08-305


Main researcher: ALFIREVIĆ, IVO (303)

Type of research: basic
Duration from: 01/01/95.

Papers on project (total): 33
Institution name: Fakultet strojarsva i brodogradnje, Zagreb (120)
Department/Institute: Department of Mechanics and Strenght of Materials
Address: Ivana Lučića 5.
City: 10000 - Zagreb, Croatia
Fax: 385 (0)1 514 535
Phone: 385 (0)1 61 11 944

Summary: Constitutive equations of nonlinear materials will be defined and strenght theories and yield criteria will be laid down. A geometrically nonlinear strenght and stability analisys of torispherical and toriconical shell structures will be carried out. Imperfection sensitivity will be researched. Some finite elements will be derivated. Elasto-plastic continuum problems with geometrical discontinuities will be anaysed. The thin-walled bar theory will be applied to analyse stress in plated structures. In all the analyses finite element method will be used.

Keywords: nonlinear analysis, thin walled structures, imperfection sensitivity

Research goals: A finite element model for analyzig an isotropic thick plate subjected to bending is expected to be derivated. A displacement method and the Mindlin-Reissner theory assuming linear elastic material response will be used. The model should be developed so that it can be extedned to problems exibiting geometrical and material non-linearities. The shortcomings of developed element should be analysed. The locking problem using both the method of mixed interpolation and the method of reduced integration is to be eliminated. When mixed interpolation is used, the effect of the discrete point location on the obtained results should be analysed. These results and the results obtained using mixed interpolation method will be compared. Finally, the future improvements for increasing the accuracy and the improving convergence of the element will be suggested. A finite element for the analysis of shell structures made of multi-layer composite materials, with each layer exibiting ortotropic behavior, will be derivated. The finite element model should be developed using the linear-elastic damage mechanics aproach. The theory of multi-layerd laminates should be represented with a special emphasis given to the strength-based criteria. The shortcomings of the developed element will be analyzed and the future impovements for increasing the accuracy and improving convergence of an element will be suggested. Numerical algorythmus for solving non-linear problems in a material will be built into the existing finite elements wich have been derivated at the Department for Technical Mechanics and Strenght of Materials. Beside the material non-linearity, algorythmus for solving problems in geometrical non-linearity, on the assumption of large and small rotations, are to be built into these finite elements.


  1. Name of institution: Institut fur Statik und Dynamik, Ruhr
    Type of institution: State institute
    Type of cooperation: Systematic exchange of information
    City: Bochum, Njemačka

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Last update: 08/13/88