Abstract
This paper discusses a global buckling analysis approach for sandwich plates with stiffening ribs. The approach is based on theoretical study and is implemented by the finite element method (FEM). The equilibrium equation corresponding to critical global buckling of the sandwich plate with stiffening ribs under simple supported boundary condition is established by the energy method. The critical buckling solutions for a typical rectangular sandwich plate system (SPS) with a single stiffening rib in the longitudinal direction are then investigated while varying the potential influencing factors. The shear rigidity within the inner core exerts little effect on global buckling and can be neglected. An FEM study on elastic buckling was then conducted via ANSYS software. The advantages of the SPS were highlighted via its elastic eigenvalue buckling numerical analysis with multiple stiffeners. The ultimate buckling loads were computed similarly for different influential factors. Finally, an SPS specimen was tested in a compression test. The results showed that when the rib spacing is large, the local buckling of the plates in the grillage is controllable and the SPS is more resistant to both local and global buckling. The results based on our theoretical method agreed well with those of the FEM and experimental results.
Highlights
Steel sandwich panels comprise two solid faceplates and one low-density core
The boundary constraints are a ected by initial bending during welding of the sandwich plate system (SPS) product, which creates a slight gap between the boundary and the xture device. e results of the sandwich plate without the PU core specimen di ered from the finite element method (FEM) and calculation results by almost the same amount (4.0%)
In the specimen with the PU core, the theoretical and experimental results di ered by 29.6%, and the curve change at the position of buckling is less obvious in the experimental specimen. is discrepancy is attributed to local buckling in the corner grids and the assumption of the rst-order buckling model, meaning that local buckling appears before the whole structure buckling
Summary
Steel sandwich panels comprise two solid faceplates and one low-density core. Initially installed in aerospace equipment, they are increasingly used in shipbuilding. Based on the finite element method (FEM), Feng et al [8] developed a new numerical simulation with shell elements for studying SPS structures. Rib-stiffened plates are the most common engineering applications of SPSs. As analysis approaches and SPS structure Conventional structure (a). Zhao et al [23] introduced an equivalent laminate modelling method that analyzes the global buckling of stiffened panels with different sectional shapes and stringer distribution forms. Amadio and Bedon [25,26,27,28] studied the effect of variable factors, including multiple mechanical and geometrical aspects, on the buckling behavior of laminated glass elements by combining theoretical methods, numerical simulations, and experiments. E present paper theoretically analyzes global buckling in SPSs with stiffening ribs and compares the buckling properties of SPS and conventional rib-stiffened structures. Parts of this paper have been published in conference proceedings by the corresponding author [29, 30]
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