Identification of Elastoplastic Material Properties Using PIES and PSO

The paper presents identification of material properties in elastoplastic boundary value problems. The direct problem is solved using the parametric integral equation system (PIES), while optimization is performed by the particle swarm optimization method (PSO). PIES is characterized by effective way of modeling of the plastic domain, only by parametric surfaces, without discretization. This makes the proposed approach more favorable (in terms of complexity) than identification using so-called element methods (the finite element method, FEM and the boundary element method, BEM). The paper contains some examples of identification of the yield stress and the plastic modulus in selected elastoplastic problems.