E. P. Popov method of analysis of elastic beams flat bending with large displacements was generalized to the case of viscoelastic beams of variable curvature radius and stiffness using an example of bending of flat springs of variable thickness symmetrical profile. https://www.diegojavierfares.com/save-now-Caire-SeQual-Eclipse-Battery-Cartridge-for-Eclipse-3-5-Concentrators-top-grab/