In some simple two-dimensional structures it is sufficient to determine only the lowest value of the load at which buckling commences. However, in the case of shells, it may be also necessary to investigate the postbuckling behavior because it has an important bearing on the magnitude of the failure load. The importance of the postbuckling behavior, which the small deflection theory of buckling...

M. Barranco, E. S. Hernández, R. Mayol, and M. Pi Departament d’Estructura i Constituents de la Matèria, Facultad de Fı́sica, Universitat de Barcelona, E-08028 Barcelona, Spain Departamento de Fı́sica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, and Consejo Nacional de Investigaciones Cientı́ficas y Técnicas, Argentina ~Received 9 December 2003; publis...

We perform a stability analysis for a fluid-structure interaction (FSI) problem in which a spherical elastic shell or membrane is immersed in a 3D viscous, incompressible fluid. The shell is an idealized structure having zero thickness, and has the same fluid lying both inside and outside. The problem is formulated mathematically using the immersed boundary framework in which Dirac delta functi...

Volodymyr P. Kravchuk,1,* Denis D. Sheka,2 Robert Streubel,3,4 Denys Makarov,3 Oliver G. Schmidt,3,4 and Yuri Gaididei1 1Bogolyubov Institute for Theoretical Physics, 03143 Kiev, Ukraine 2Taras Shevchenko National University of Kiev, 01601 Kiev, Ukraine 3Institute for Integrative Nanosciences, IFW Dresden, 01069 Dresden, Germany 4Material Systems for Nanoelectronics, Chemnitz University of Tech...

Hydrothermal convection of pore water with a temperature-dependent viscosity within a permeable, internally heated, moderately thin spherical shell is investigated by both a perturbation analysis and a direct numerical simulation. The analysis and simulation are mainly focused on a thin spherical shell in that convective instabilities are characterized by the spherical harmonic degree l=6 with ...

We present a theoretical study of the energetics of thin nematic shells with two charge-one-half defects and one charge-one defect. We determine the optimal arrangement: the defects are located on a great circle at the vertices of an isosceles triangle with angles of 66^{∘} at the charge-one-half defects and a distinct angle of 48^{∘}, consistent with experimental findings. We also analyze ther...

Hollow spherical nanoparticles with ordered mesoporous silica shells were fabricated by evaporation-induced self-assembly using (NH(4))(2)SO(4) and cetyltrimethyl ammonium bromide (CTAB) as templates. The model drug, L-methionine, was encapsulated within the spherical void at high loadings by repeated crystallization.