The work aims to construct a novel buckling theory model to predict the buckling behavior of composite sandwich plates more accurately and improve the reliability and safety of structural design. Based on the elasticity theory and the Timoshenko beam framework, a novel buckling theory model was constructed for composite sandwich plates and the calculation formula applicable to both global and local buckling was derived, which was concise and suitable for rapid engineering design and optimization. At the same time, parametric research was carried out and the accuracy of the model was verified by finite element simulation. The novel model could predict the buckling load more accurately, with less calculation error and was more applicable than the traditional method. Parameter analysis showed that the buckling performance of composite sandwich structure was affected by the tensile, bending and shear stiffness of the plate. Due to the lack of direct quantitative relationships among these parameters, composite structures exhibited buckling behavior different from isotropic counterparts, such as changes in bending stiffness caused by ply sequence and reduced local buckling capacity due to weaker shear stiffness. The proposed novel buckling theory model provides theoretical support and efficient and accurate calculation tools for buckling analysis and design of composite sandwich plates in engineering, which is of great significance for optimizing structures and improving mechanical properties.
Key words
composite sandwich structures /
buckling properties /
analytical model /
finite element analysis
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