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The two levels strength design methodology is presented. First the optimal main vessel dimensions and overlaps, resp. ribbon prestressing are assessed utilising the simplified geometrical and material model, namely the equivalent cylindrical compound vessel and linear elastic material. On the second computational level the more precise stress and strain analysis is performed with the help of problem oriented finite element method (FEM) code PROKOP, taking into account the nonstationary temperature field, elastic-plastic material behaviour, crack presence etc. and also the whole loading history including the assembly and disassembly process. The strength condition for sintered carbide WC-Co in the form of modified brittle fracture criterion was utilised and mixed computational-experimental approach for the low cycle lifetime determination has been proposed.

The completed ribbon-winding theory, including temperature loading of the high-pressure compound vessel, was proposed. The influence of the bending stress in the wound ribbon is taken into account. Internal core of the compound vessel consists of matrix and ring, made of different materials. The relations were derived in analytical form, describing the radial distribution of necessary tangential prestressing.

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The paper deals with the optimal strength design of the belt chamber compound vessel of mixed construction, consisting of the matrix made of sintered carbide, supporting steel ring, and outer wound supporting cylinder. The maximum stress of all components being equal to the design stresses, the effective stress distribution in wound cylinder is uniform. Outer radius of the wound part is taken as an objective function. The set of transcendental equations has been derived to calculate all necessary geometrical parameters and their discussion was carried out.