The theory is applied to section analysis in sheet metal forming.

Using elasto-plastic large deformation FEM based on finite deformation virtual power-rate, a kind of two-node plane-strain shell element model for section analysis is constructed.

Then a new sectional analytical model for steel fiber reinforced concrete beams under the combined action of bending moment and shear is established by adding the bending moment action into the model of Vecchio and Collins, a sectional analysis model for reinforced concrete membrane element under pure shear.

Analytical solution on the overestimation of thickness of interfacial transition zone around grain with arbitrary convex shape by the section analysis method;

By instrumental impact test and fracture analysis, the impact property of precipitatation-hardening stainless steel FV520(B) , aged at 350,420,470,520,560,600 and 630℃ was investigated.

Some in-site vibrating test and metal fracture analysis have been done to reveal that the crack of the U-shaped bolts is fatigue failure and some reference for designer is put forward.

On this paper, for the failure of a superheat steam pipe, via microscopic and macroscopic studies, we took the physical and chemical inspection, such as chemical composition, mechanical properties, metallographic structure, we also took the fracture analysis, then we got the failure reasons of the superheat steam pipe.