Abstract: Destabilization of a large-scale pre-stressed cylinder often occurs in the complicated wire-winding process. On the basis of the traditional destabilization check formula of a isostension wire-winding cylinder, a new stability check formula for iso-shear stress wire-winding cylinder is proposed in this article. Taking for example several sets of large-scale pressed winding cylinders of the isostatic presses (for 545 MN and 726 MN, etc.), stability is checked by the proposed formula. Compared with the actual measured data, the reliability of the proposed method and the correctness of the expression of external pressure in pre-tighten status are verified. The results indicate that the proposed formula can provide a theoretical foundation for destabilization check of wire-winding pre-stressed cylinders. These results also provide a valuable reference for the scheme design and optimization of a large-scale wire-winding pre-stressed cylinder.

Key words: prestressed materials, wire-wound pressure vessels, iso-shear stress, instability, external pressure