Elastoplastic buckling and collapse of spherical shells under combined loadings

Mamadou Tall (1, 2) , Said Hariri (1) , Philippe Le Grognec (3) , Yves Simonet (2)

1 Mines Douai EMD - École des Mines de Douai
2 CEntre Technique des Industries Mécaniques - Cetim (FRANCE)
3 IRDL - Institut de Recherche Dupuy de Lôme

In this paper, the buckling behavior of a complete spherical shell under external pressure and of a half-sphere under torsion are first investigated. Several parametric studies are performed, which rely on the European Recommendations framework (ECCS text), so as to identify the different key parameters of the corresponding buckling capacity curves and lead up to both a qualitative and quantitative discussion about the imperfection sensitivity of such structures under each fundamental load. The related results allow us to completely describe the buckling behavior of a spherical shell under combined external pressure and circumferential shear by means of interactive buckling curves, without the need of many supplementary computations for any arbitrary combined loading case.

Keywords: Spherical shells; Buckling; Post-buckling; Elastoplasticity; External pressure; Torsion; Interaction curves; Geometric imperfections

Domains: Physics [physics]; Mechanics [physics]; Mechanics of materials [physics.class-ph]

Mamadou Tall, Said Hariri, Philippe Le Grognec, Yves Simonet. Elastoplastic buckling and collapse of spherical shells under combined loadings. Thin-Walled Structures, 2018, 123, pp.114-125. ⟨10.1016/j.tws.2017.10.041⟩. ⟨hal-01704544⟩