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Numerical Analysis of a Separable Metal Composite Pressure Vessel
Journal Article
01-16-01-0005
ISSN: 1946-3855, e-ISSN: 1946-3901
Sector:
Topic:
Citation:
Egorov, A., "Numerical Analysis of a Separable Metal Composite Pressure Vessel," SAE Int. J. Aerosp. 16(1):75-85, 2023, https://doi.org/10.4271/01-16-01-0005.
Language:
English
Abstract:
This article presents a numerical solution to the problem of delamination in a
separable Metal Composite High-Pressure Vessel (MC HPV). This problem is
associated with local buckling of the inner metal shell (liner) surrounded by an
outer rigid composite shell. A geometrically and physically nonlinear MC HPV
deformation model is constructed considering the three-dimensional stress-strain
state, real-time mode, and technological deviations inherent in real vessel
designs. The model combines the deformation of the vessel end domes and the
cylindrical part. A unilateral constraint is believed to exist on the interface
between the liner and the composite shell, allowing the liner to delaminate from
the latter when bending. Calculations are performed using the finite element
method in the LS-DYNA software package in a dynamic formulation. The vessel is
divided into solid finite elements such as TSHELL and SOLID. Numerical analysis
of delamination is carried out for two design schemes of the separable vessel:
without technological deviations and in the presence of technological deviations
on the cylindrical part of the vessel. A local small-thickness gap between the
liner and the composite shell is taken as a technological deviation so that the
liner and the composite shell have a regular geometric shape without initial
imperfections. Comparative analysis showed weak mutual influence of local bends
on the end dome and the cylindrical part of the liner. Deformation of the liner
end dome is of a complex nature; circumferential and radial wrinkles of local
buckling appear on it in the zone of plasticity.