Dynamic behaviour of a two-layer metal composite pressure vessel

Abstract

To compute deformations of a metal composite high-pressure vessel, the paper proposes a finite-element model implemented in the LS-DYNA software package in a dynamic formulation. The model is designed to carry out dynamic calculations, it combines three bodies: composite shell, inner metal shell (liner) and rigid flanges. A unilateral constraint is introduced on the contact surface of the liner-composite shell. A geometrically and physically nonlinear problem is solved with the determination of the moment of the vessel delamination. The calculation of a cylindrical carbon-filled plastic vessel with an aluminium liner during heating is given. The calculation results are presented in the form of an image of the deformed surface of the liner and in the form of a graph of time-dependent circumferential stress variation in the liner. According to the data obtained, the critical stresses in the liner, the time and temperature corresponding to the local buckling of the liner are established. The indicated data is valuable when estimating delamination possibility of such vessels already at the design stage.