Technical gazette, Vol. 23 No. 2, 2016.
Preliminary communication
https://doi.org/10.17559/TV-20140226123632
An approximation of deflection line function at the rod loaded by buckling under self-weight
Željko Rosandić
; Mechanical Engineering Faculty in Slavonski Brod, J. J. Strossmayer University of Osijek, Trg Ivane Brlić Mažuranić 2, HR-35000 Slavonski Brod, Croatia
Stanislav Kotšmíd
; Faculty of Environmental and Manufacturing Technology, Technical University in Zvolen, Študentská 26, 960 01 Zvolen, Slovak Republic
Pavel Beňo
orcid.org/0000-0002-6595-7757
; Faculty of Environmental and Manufacturing Technology, Technical University in Zvolen, Študentská 26, 960 01 Zvolen, Slovak Republic
Marián Minárik
; Faculty of Environmental and Manufacturing Technology, Technical University in Zvolen, Študentská 26, 960 01 Zvolen, Slovak Republic
Abstract
The paper deals with an approximation of the exact deflection line function at a rod loaded by self-weight buckling via the function, which is best-presented by the exact shape of this rod. In this paper, we suggest the methods of derivation of the critical buckling length by the exact solution and by the energy method. For the substitute functions of deflection line, the variants of goniometric functions and polynomials are chosen. Individual coefficients of the functions are chosen on the basis of existing boundary conditions and in the case of their insufficient count, they are chosen in order to express the exact rod deflection line shape in the most suitable way, which was transposed from the concrete example solution by SolidWorks Simulation software. The paper shows the errors of critical buckling length calculation against the exact solution, as well as the maximum absolute and relative deviations in the lateral displacement for the chosen function. From the individual substitute functions, one function that meets the condition for general use and has the lowest deviations from the exact solution, is subsequently chosen.
Keywords
approximation of function; buckling; polynomials; self-weight
Hrčak ID:
156855
URI
Publication date:
27.4.2016.
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