Bases of calculation stretch forming process thin double-convex shells

Developed analytical method for the calculation of parameters stretch forming under the condition of the membrane stress state of a sheet material in vertical planes of symmetry of the pulling of the punch, providing preferential nature of the development of a plastic zone of the сentral part, depending on the geometric shape of the shell with double curvature and the anisotropy of the sheet material. Derive the resulting equations for the direct detection of deformations stretch forming shell of double curvature for the middle surface, is given to the vertical planes of symmetry and determine the appropriate parameterization.