Gradient based mehtods,geentic algorithms and the finite element mehtod form the identification of material parameters

摘要

In order to achieve higher accuracy n the identificaitn of material parameters,a gradient based optimisation technique is combined with a finite element method.Associated with this identificaiton scheme a sensitivity analsyis is developed on the base of direct differentiatin of the finite elemnt formulation and particularly the algorihtm of evaluation fo stress and internal variables.To solve the problem of the initial guess,a genetic algorithm is used to start the process of dientification.The efficiency of the proposed approahc is demonstrated on the identificaiton of an anisotropic elasto-plastic behaviour for aluminium alloys.