The relationship between the strains and stresses will be considered based on the premise that for every increment of load deformation occurs, consisting of two parts - the elastic and plastic
The program of calculation by finite element method. Basis of its program described in the work [Siratori, T. Miesi, and Kh. Matsushita,Numerical Mechanics of Fracture], which has implemented the theory of plastic flow and deformation theory. The plastic problem is solved by the incremental method of loading, with each increment of load shifted one element to the plastic zone.