Hyperbolic Equations with Unknown Coefficients

Кожанов, А. И.

doi:10.3390/sym12091539

Cited by 2 publications

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References 24 publications

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“…Both phenomena from nature and models from engineering domains are described by partial differential equations of the second order, known as equations of mathematical physics [1]. For example, dynamic processes are described by hyperbolic equations [2][3][4] (like wave equations for oscillatory motions) and transfer phenomena are described by parabolic equations [5][6][7][8][9]. When the time variable is not present, processes are described by Poisson's equation and by Laplace's equation.…”

Section: Introductionmentioning

confidence: 99%

Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated Forces

2022

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The stress state from an eccentric ring made of an elastic material symmetrically loaded on the outer boundary by concentrated forces is deduced. The analytical results are obtained using the Airy stress function expressed in bipolar coordinates. The elastic potential corresponding to the same loading but for a compact disk is first written in bipolar coordinates, then expanded in Fourier series, and after that, an auxiliary potential of a convenient form is added to it in order to impose boundary conditions. Since the inner boundary is unloaded, boundary conditions may be applied directly to the total potential. A special focus is on the number of terms from Fourier expansion of the potential in bipolar coordinates corresponding to the compact disk as this number influences the sudden increase if the coefficients from the final form of the total potential. Theoretical results are validated both by using finite element software and experimentally through the photoelastic method, for which a device for sample loading was designed and constructed. Isochromatic fields were considered for the photoelastic method. Six loading cases for two different geometries of the ring were studied. For all the analysed cases, an excellent agreement between the analytical, numerical and experimental results was achieved. Finally, for all the situations considered, the stress concentration effect of the inner hole was analytically determined. It should be mentioned that as the eccentricity of the inner hole decreases, the integrals from the relations of the total elastic potential present a diminishing convergence in the vicinity of the inner boundary.

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