Elastoplastic analysis of plane stress/strain structures via restricted basis linear programming
An automatically determined load step for nonlinear plane stress/strain analysis. A solution for problems of unloading and twofold yield situation in PWL problems. Less CPU time and more accurate results compared to similar existing algorithms. Mixed FEM formulation to enable the solver to return sufficiently accurate results. A suitable linear surface envelope definition for von-Mises yield surface.
plane stress nonlinear analysis piecewise-linear model mathematical programming plane strain mixed finite element formulation