Technological Stability of the Liner in a Separable Metal Composite Pressure Vessel

The article considers one of the possible mechanisms of loading the solidity of a cylindrical metal composite high-pressure vessel (MC HPV). This mechanism manifests itself as delamination of a thin-walled metal shell (liner) from a more rigid composite shell causing local buckling. A similar effect can be detected in the manufacturing process of MC HPV, when the composite shell is formed by winding with tension a carbon fiber-reinforced plastic tape on the liner. Pressure transfer from the composite shell to the liner is carried out by the method of temperature analogy, that is, by cooling the composite shell, thermally insulated from the liner. To solve the problem of externally confined liner local buckling a software-based approach is proposed, which is based on three points: the introduction of local technological deviations inherent in actual structures, the determination of the general stress-strain state, and a real-time deforming. The approach is implemented in the LS-DYNA software package in a dynamic formulation using solid finite elements. In the MC HPV deformation model, composite shell is considered to be elastic, multilayer, and liner-to be elastoplastic, isotropic. The contact between the liner and the composite shell is unilateral, normal; there are no tangent interactions. Technological deviations are presented in the form of cutouts in the liner and the composite shell on the cylindrical part of the vessel with the dimensions of permissible defects.