Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated Forces
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 loadi...
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MDPI AG
2022-04-01
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| author | Stelian Alaci Florina-Carmen Ciornei Ionut-Cristian Romanu |
| author_facet | Stelian Alaci Florina-Carmen Ciornei Ionut-Cristian Romanu |
| author_sort | Stelian Alaci |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T10:32:09Z |
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| id | doaj.art-86e9d2c4d17c4a1ba6d4cc1ca058676d |
| institution | Directory Open Access Journal |
| issn | 2227-7390 |
| language | English |
| last_indexed | 2024-03-09T10:32:09Z |
| publishDate | 2022-04-01 |
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| spelling | doaj.art-86e9d2c4d17c4a1ba6d4cc1ca058676d2023-12-01T21:12:15ZengMDPI AGMathematics2227-73902022-04-01108131410.3390/math10081314Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated ForcesStelian Alaci0Florina-Carmen Ciornei1Ionut-Cristian Romanu2Mechanics and Technologies Department, Faculty of Mechanical Engineering, Automotive and Robotics, Stefan cel Mare University of Suceava, 720229 Suceava, RomaniaMechanics and Technologies Department, Faculty of Mechanical Engineering, Automotive and Robotics, Stefan cel Mare University of Suceava, 720229 Suceava, RomaniaMechanics and Technologies Department, Faculty of Mechanical Engineering, Automotive and Robotics, Stefan cel Mare University of Suceava, 720229 Suceava, RomaniaThe 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.https://www.mdpi.com/2227-7390/10/8/1314eccentric ringconcentrated forcesymmetric loadstress statephotoelasticity |
| spellingShingle | Stelian Alaci Florina-Carmen Ciornei Ionut-Cristian Romanu Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated Forces Mathematics eccentric ring concentrated force symmetric load stress state photoelasticity |
| title | Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated Forces |
| title_full | Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated Forces |
| title_fullStr | Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated Forces |
| title_full_unstemmed | Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated Forces |
| title_short | Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated Forces |
| title_sort | stress state in an eccentric elastic ring loaded symmetrically by concentrated forces |
| topic | eccentric ring concentrated force symmetric load stress state photoelasticity |
| url | https://www.mdpi.com/2227-7390/10/8/1314 |
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