Based on the principle of minimum potential energy with mixed variables for beams with large deflections, the paper presents an approximate method for cylindrical bending of large deflections of panels with two edges fixed.

Three-dimensional differential equations for bottomhole assembly under large deflection;

Springback finite-element analysis for large deflection of bending thin plate;

Element-free method for thin plate analysis with large deflection;

Calculating of maximum deflection and minimum tensile force in belt between the carrying rollers of belt conveyor;

Analytic method about maximum deflection of crane girder under the movement of single crane;

The formulas of minimum tensile force and maximum deflection are worked out.

Based on the geometrically nonlinear theory of Eulerian beam, governing equations of beam deformation with elastic-plastic large-deflection subjected to mechanical loads were established by using ideal elastic-plastic model.

On the basis of elasticity of the large-deflection thin penal,the method of weighted residuals is applied in cal-culating the stress and deflection of the curtain-wall glass.

Based on the finite element theory, a large-deflection flexible cable is discretized into a series of cable element and the nonlinear finite element equations are derived With the approach in the paper, cable structures of any shapes and subjected to any loads can be treated.

A weighted residual method with variable conversion and cyclic iteration is proposed in this paper , which facilitates the approximate solution of nonlinear coupling partial differential equations of large deflection plate.