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.
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.
COOPERATION - INSTITUTIONS
Name of institution
: Institut fur Statik und Dynamik, Ruhr Type of institution: State institute Type of cooperation: Systematic exchange of information City: Bochum, Njemačka Other information about the project.