Based on the Boltzmanns superposition principles of linear viscoelastic materials for quasi-static problems of viscoelastic thin plates was given. By the Galerk
Crack line field analysis method has become an independent method for crack elastic-plastic analysis, which greatly simplifies the complexity of crack elastic-p
Backlund transformation, exact solitary wave solutions, nonlinear supperposi tion formulae and infinite conserved laws are presented by using TU-pattern. The al