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Scientific project: Warping and distortion of thin-walled sections

Project code  023-0231744-3010

Project name Warping and distortion of thin-walled sections

Senior researcher  Radoslav Pavazza

Institution of employment University of Split, Faculty of Electrical Engineering, Mechanical Engineering a...

Program name Modelling and Optimisation of new materials and structures

Scientific area technical science

Peer review group Mechanical Engineering;Shipbuilding;Traffic Technology and Transportation;Aeronautics and Space Technology

Summary The classical theories of thin-walled beams (Timoshenko, Vlasov) are based on the assumption that the cross-section shape is maintained during deformations. Owing to this assumption, the stress analysis becomes relatively simple, both in the beam bending and torsion, and with this way acceptable for the engineering practice. The assumption, meanwhile, presumes a cross-section that has a sufficient stiffness with respect to the shape distortion, or a load distribution in the transverse direction so that distortion can be neglected. In practice, these changes are usually small and can be ignored. Meanwhile, in the case of extremely thin-walled structures, these changes may have significant influences on the stress distribution. In the case of bending, the cross-section warping can be taken into account, in a relatively simple way, in the calculations of displacements; in the case of stress calculations, the cross-section warping is usually ignored. In the case of torsion, the cross-section warping is a part of the theory of torsion. Warping due to shear, related to the relatively short beams, is the subject of newer investigations. The goal of this investigation is to improve the theories of bending and torsion by taking into account warping and distortion of the cross-sections. The solutions related to modelling of light thin-walled structures will be considered. The intention is to determine a thin-walled beam as a finite element, to model thin-walled structures, such as marine and civil structures, in a relatively simple way. The problem of the cross-section asymmetry will be considered. Expressions for strength and stability of the elements of plated structures will be considered, particularly with respect to the cross-section asymmetry. The results of the investigation, which will be given in the analytical, parametric form, will be checked by using modern numerical methods, as well as by experimental methods. The results will be compared with recent investigations in the field, published in recognised international scientific journals. The investigation should be able to give standards for the calculation of thin-walled structures, such as marine and civil plated structures. The project will investigate possible application of obtained solutions in reliability analysis of existing structures, by well known probability approaches. In the application of the results of the investigation, cooperation with Croatian Register of Shipping.

Key words |thin-walled cross sections|warping,distortion

Contract from 2.1.2007

Croatian scientific bibliography http://bib.irb.hr/lista-radova?sif_proj=023-0231744-3010&print=true&lang=EN

Address for communication
 Name and surname Radoslav Pavazza
 Street and no. Put Sv. Mande 12, 21000, Split
 E-mail Radoslav.Pavazza@fesb.hr
 Web address
Project assistants 
  Name and Surname  Status
Dario Ban Researcher
Branko Blagojević Researcher
Branka Bužančić Primorac Scientific novice
Ado Matoković Researcher
Radoslav Pavazza Project leader
Bože Plazibat Researcher
Frane Vlak Researcher
Marko Vukasović Scientific novice
Kalman Žiha Researcher