NUMERICAL AND EXPERIMENTAL INVESTIGATIONS ON BUCKLING BEHAVIOUR OF SHALLOW AND HEMISPHERICAL SHELLS

摘要

The buckling behaviour of thin walled spherical and shallow spherical shells depends on the geometry, thickness, material conditions and loading pattern. In this study, the effect of geometrical variation, thickness, end-conditions and loading types are considered. Metallic samples are prepared considering the radius to thickness ratio. The effect of these parameters on the buckling behaviour is studied. Quasi-static and impact loadings are applied and the buckling patterns are obtained for each category of spherical shells. Experiments were conducted on samples as received condition. Numerical analysis has been carried out to predict the buckling pattern of spherical shells and compared with the experimental observation. The buckling pattern could be closely predicted by the numerical study with the variation in the buckling strength. Moreover the effect of the nonlinearity on material behaviour and geometrical imperfections are incorporated in the numerical analysis using COSMOS/ M software.