Investigation On Buckling Behavior Of Composite Conical Shells Under Pressure

With the development of science and technology,lightweight structures and thin-walled structures have been widely used,and their safety issues have attracted much attention.Buckling of thin-walled structures is a major failure or failure mode and directly threatens the safety of the structural system.Thin-walled cylindrical shells and conical shell-shaped storage tanks are relatively common structural forms at present,and the external loading environment is mainly concentrated on axial pressure,external pressure and lateral load.During the processing and installation of these structures,local defects and damage will reduce the bearing capacity of the structure.Therefore,it is necessary to study the buckling of the conical shell.In order to solve these problems,the open conical shell structure with defects is used as the object,and the numerical simulation method is used to study the shell buckling phenomenon and the influence on the bearing capacity under axial compression and external pressure.Through the study of these issues,provide an important basis for engineering design.Firstly,the buckling characteristics of the open cone shell of the composite material under the coupling of external pressure and axial compression are studied.The problems were investigated by using finite element analysis software.The buckling behavior of the composite conical shell under the coupling of external pressure and axial compression was studied.The results show that the increase of internal pressure can increase the axial bearing capacity of the shell and the increase of external pressure will reduce the bearing capacity of the shell;Secondly,the imperfection-sensitivity and local buckling of the shell during the buckling of the conical shell are discussed.Geometric defects directly reduce the bearing capacity of the conical shell.When the defect is located in the middle of the shell,the effect on the shell buckling is greater.When the size of the defect is small,the external pressure has a greater impact on the bearing capacity of the shell.Finally,the influence of the cone angle of the cone containing the defect on the buckling was studied.The results show that the cone angle of the cone has a great influence on the buckling of the structure.The results show that the critical angle of the cone angle is about 60 degrees and 15 degrees.When the cone angle is between them,the bearing capacity of the shell will be greatly changed.The obtained KDF curve provides a reliable basis for the design of the composite conical shell.