Nonlinear Buckling Analysis of Defected Sandwich Tubes under External Pressure
In order to study the nonlinear buckling problem of the sandwich tube under external pressure,the finite element software ANSYS was used to establish a model of the sandwich tube,and the initial defects of nonlinear buckling were generated by the buckling modes obtained from the linear buckling analysis,and the nonlinear buckling analysis was carried out on the sandwich tube under external pressure.It is found that in the process of buckling under external pressure,the laminated pipe containing modal defects produces deformation in the direction of pipe diameter,including compression deformation and expansion deformation,and the deformation propagates along the axial direction,and the amount of compression deformation is always larger than the amount of expansion deformation.With the inflection point method,that is,the ratio of the two to determine whether the sandwich tube is unstable or not,this method can accurately determine the value of external pressure of the sandwich tube instability.In addition,this inflection point method can be used to analyze the destabilized external pressure of internal and external pipes and sandwich layers with the same initial defects and different thickness-to-diameter ratios.The research results can provide reference for the application of sandwich tubes.
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