مدل سازی عناصر محدود چند عاملی رفتار غیر خطی پیزوکارامای پلی کریستالی با توجه به فازهای تتراگونال و رومبوگرام

The nonlinear behavior of a polycrystalline piezoceramic materials based on the two-level finite element homogenization method was investigated. Numerical experiments were carried out for rhombohedral and mixed (tetragonal-rhombohedral) variants within a single crystal using a micromechanical model of the material. Based on the results of numerical experiments, the remanent part of the free energy accounting dependence of the saturation strain on the type of the multiaxial deformed state was constructed.