Investigation on Snap-Through Buckling Behavior of Dished Shells Under Uniform External Pressure

Abstract

Previously, buckling behavior of several conical and spherical shells have been studied with great rigor. In this paper, snap through buckling behaviour for metallic dished shells under uniform external pressure is investigated. These shells are geometrically complex since it consists of a shallow conical frustum with a flat closed top. Such shells find many engineering applications, for instance as actuator elements in control components in cryogenic engines. Currently, no clear guidelines exist for design performance evaluation of such peculiar shells. This paper aims to establish a valid FE methodology for buckling and post buckling analysis of such shells using ABAQUS in tandem with experiments. A parametric study is carried out to understand the effect of geometrical parameters and imperfection sensitivity of these shells to snap-through buckling. Moreover, experiments were carried out using 3-D Digital Image Correlation(3D-DIC) for measuring whole-field deflection and strains. Numerical analysis was carried out, using generalized Eigen value analysis and non-linear analysis using modified-Riks technique with various material models, to correlate with the experimental observations. Non-linear elasto-plastic analysis with perfectly elastic-plastic material model agrees well with the experimental observations. Comparison of results from the numerical study indicates that material plasticity has a major effect on critical buckling pressure.

Material design of intelligent plastic products with sound generation function due to snap-through buckling

“…Therefore, a plastic product having a sound generation system by buckling can be classified in a biomimetic material. In this study, we firstly developed such a product composed of only conventional plastics, in which snap-through buckling [12][13][14][15][16] was utilized to generate sound. Snap-through buckling is a phenomenon that occurs beyond the critical deformation point, whereby the shape of a product changes suddenly.…”

“…Although the elastic energy stored in an elastic-plastic body increases steadily with increasing strain, there is a large release of energy and an abrupt change in shape once snap-through buckling occurs. Moreover, buckling is often accompanied by sound generation [11][12][13][14][15][16]. In the present study, a hinge part is provided to have two metastable positions, which will be explained in detail.…”