Transverse shear deformation at each layer must be considered accurately when buckling a- nalysis is performed for composite sandwich structures, due to significant difference of mechanical proper- ties between each layer. For this,a four-node plate element based on Reddy＇s Layerwise plate theory is de- veloped in this paper,which applies the first-order shear deformation theory at each layer. Mixed interpola- tion of tensorial component is employed to solve the shear locking problem. Then, three numerical examples are analyzed. The results show that the proposed element can discretely consider the mechanical properties of each layer;the accuracy of the proposed finite element is good;the results fit well with the results predic ted by three dimensional elastic theory or high-order plate theory when the plate is modelled by several lay- ers elements as well as with ones predicated by the first-order shear deformation plate theory when the plate is modelled by single layer elements.
Acta Mechnica Solida Sinica
sandwich structures, buckling, composite, Layerwise plate theory, finite element