Some questions of the finite element method applicability for calculation of structure nonlinear deformation

An algorithm for finite-element method calculations of generalized plane deformation allowing one to simulate stress-deformed state of reactor core elements at considerable radiation deformation of materials is given. For the elastic-plastic task the joining of methods of the elastic variable parameters with numerical integration of the system of linear differential equations, which increases stability of the numerical integration and conserve capability of geometric nonlinearity account, is suggested. 4 refs.; 2 figs