Multi-Scale Failure Analysis Model for Cryogenic Pressure Vessel Under Combined Thermal Stress and Mechanical Stress

Le résumé fourni par la source

Abstract Cryogenic pressure vessels are promising types of containers, garnering significant attention due to their high energy storage density and low evaporative losses. These vessels are engineered with an outer shell, an insulation layer, and an inner vessel which is the fiber fully overwrapped metal liner. The core structural part, the fiber fully overwrapped metal liner, is designed to direct contact with cryogenic fluids, subjecting it to complex thermo-mechanical loads. Consequently, a comprehensive understanding of the thermodynamic responses of the vessels under cryogenic conditions is imperative to ensure their operational safety and reliability. Current analyses of the thermo-mechanical coupling in the liners primarily focus on the macroscopic thermal stresses caused by the mismatch in thermal expansion coefficients between the metal liner and the fiber wound layer, as well as the thermal stress between different fiber wound layers. However, the microscopic thermal stress caused by the difference in thermal expansion coefficients between the fiber and the matrix is not negligible. Therefore, this paper established a multi-scale model based on representative volume elements and conducts a thermo-mechanical coupled analysis of the fiber fully overwrapped metal liner. It predicts the distribution of thermal stresses within the fiber and matrix at various temperatures, as well as the failure pressure of the vessels.

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