Abstract: With the application environment of laminated plates becoming more and more complex, they are often in different temperature environment and often need to drill a circular-hole for mechanical connection, and the size of thickness direction is small, so they are prone to buckling when compressed. Therefore, it is of great significance to study the effects of different temperatures and circular-hole defects on the buckling characteristics of laminated plates. Firstly, the theory of Euler beam is reviewed, and the analytical solutions of the equilibrium load and deflection curve of the beam under the condition of hinged compression at both ends are derived. Furthermore, the finite element method is used to study the buckling problem of isotropic plates. The buckling load and buckling mode are compared with the analytical solution based on the Euler beam theory to determine the appropriate mesh density and verify the correctness of the model. Then, the buckling characteristics of quasi-isotropic laminated plates with different circular-hole sizes are analyzed at different temperature levels, and the first five buckling loads and modes are obtained respectively. Finally, the effect of the depth of the circular-hole on the buckling behavior of the laminated plate is studied. The results show that with the increment of temperature, the buckling load of laminated plates with the same hole size decreases linearly. With the increment of the circular-hole size at the same temperature, the buckling load decreases faster and faster; with the increment of the hole depth at the same circular-hole size, the buckling load decreases firstly and then increases, showing symmetry.

Key words: temperature, circular-hole defect, laminate, buckling load, buckling mode, composites