As a new form

closed composite mast provides a delightful future in application.Some reference can be set to enhance the security from researches on local mechanical characteristics of the composite structure of the radar cap.The contribution pattern of stress and strain in composite sandwich plate under different loading conditions in the form of single span and cantilever is obtained.The weak part has been found out

and major reason of local structure damage has been uncovered.According to the experiment

overall structural performance is influenced by the glue layer;sandwich plate structure has already been damaged before stress reaches its limit.Inter-layer desquamation is the main reason of damage.