Buckling of an elastic hemispherical shell with an obstacle |
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Authors: | Alberto Maria Bersani Ivan Giorgio Giovanna Tomassetti |
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Affiliation: | 1. Dipartimento di Scienze di Base e Applicate per l’Ingegneria, Sapienza Università di Roma, via A. Scarpa 16, 00161, Rome, Italy 2. International Research Center for Mathematics and Mechanics of Complex Systems (M&MoCS), Palazzo Caetani, 04012, Cisterna di Latina, LT, Italy 3. Dipartimento di Ingegneria Meccanica e Aerospaziale, Sapienza Università di Roma, via Eudossiana 18, 00184, Rome, Italy
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Abstract: | We study the buckling of an axially symmetric elastic hemispherical shell, uniformly compressed, subject to a constraint to the radial shifting of the equatorial circumference. The static equilibrium equations, using tensorial notations, are obtained applying the virtual displacements principle to the energy functional. The presence of a constraint does not modify the field equations with respect to the case of a constraint-free buckling, but only influences the boundary conditions, so that, instead of a boundary value problem, we deal with a problem with complementarity conditions on the boundary. We revisit and improve some previously obtained mathematical results, adapting them for the subsequent numerical treatment. Finally, by suitably using a delicate quasi-static shooting technique, numerical results are obtained, which complete the theoretical analysis and give an interesting insight into the behavior of the bifurcation branches. |
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