Abstract: Taking the double-walled core barrel of a certain type of hot isostatic pressing (HIP) furnace as the research object, this study investigates the influence of the equal shear stress pre-stressed steel wire winding layer on the buckling failure behavior of the core barrel based on the cylindrical buckling theory. Two numerical simulation methods, namely elastic prestressed buckling analysis and elastoplastic prestressed buckling analysis were adopted. The critical external pressure for buckling obtained from the simulations is compared and verified with the analytical value derived from the classical Bresse-Bryan formula. The results show that there is a significant deviation between the analytical value of the Bresse-Bryan formula and the numerical simulation results, with the analytical value being excessively high, which fails to accurately characterize the actual external pressure-bearing capacity of the core barrel. Compared with the results of the elastic pre-stressed buckling analysis and the analytical value, the calculation results of the elastoplastic pre-stressed buckling analysis exhibit the highest agreement with the actual bearing characteristics. Further investigations into the effects of interlayer gap, slip effect, and water-cooling groove structure of the double-walled barrel on the critical external pressure for buckling reveal that an increase in interlayer gap, a decrease in interfacial friction coefficient, and the presence of water-cooling grooves all lead to a decrease in the critical external pressure for buckling of the core barrel. The research results of this paper may provide theoretical support and engineering design guidance for the external pressure buckling failure analysis of pre-stressed steel wire-wound core barrel structures.

Key words: buckling, HIP, core barrel, prestress, elastoplastic