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Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):

C. Bilik, F. G. Rammerstorfer, T. Daxner, G. Figala, B. Buchmayr:
"Improving the Dynamic and Stability Behaviour of Plates by Laser Treatment";
Vortrag: 6th International Congress of the Croatian Society of Mechanics, Dubrovnik; 30.09.2009 - 02.10.2009; in: "Proceedings of the 6th ICCSM", I. Smojver, J. Soric (Hrg.); (2009), ISBN: 978-953-7539-11-5; Paper-Nr. 104, 8 S.



Kurzfassung englisch:
It is well known that residual stresses influence the stability and the vibration behaviour of structures. Residual stresses for improving the dynamic behaviour of plates are typically introduced by local plastic deformation processes. In contrast to this rather "classical" approach, it is shown in the present paper how proper heating by a laser beam can lead to residual stress distributions which are beneficial with respect to the increase of both the fundamental frequency and the buckling load. Corresponding computational simulations as well as experimental investigations are presented.
The analyses were performed using the finite element method in combination with algorithms simulating the heat input from continuously moving and intermittingly acting laser beams, respectively, onto the surface of the considered plates. The coupled
temperature and deformation analyses comprise material and geometrical non-linearities. Due to the one-sided heat input a temperature moment is induced leading to distortions which act as imperfections that affect the buckling behaviour of the cooled-down plates. A number of laser tracks of different shapes are investigated, and it is shown that reasonably good results involving relatively small residual distortions and a significant increase of fundamental frequencies and buckling loads can be achieved by introducing the laser heat input in a raster of points appropriately distributed over a plate´s surface.
An experimental set-up was developed which confirms the principal potential of improving the dynamic and the stability behaviour of plates by laser heating.


Zugeordnete Projekte:
Projektleitung Franz G. Rammerstorfer:
Fertigungstechnischer Leichtbau


Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.