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Abstract
In the present study the model of plastic deformation of porous powder materials (PPM) is described and numerically simulated. This model enables prediction of change of fundamental technological parameters of PPM in plastic deformation conditions, i.e. porosity, pore size, specific surface and mechanical properties. Porous media is described by unit cells consisting of eight powder particles. The parameters of unit cell (the distance between the centers of particles, the angles of the array and the dimensions of interparticle connections) form the model of porous material and define its technological characteristics. The model takes into account the effect of deforming anisotropy on PPM properties. Calculations are performed in nonorthogonal coordinates connected with unit cell. In the case of uniaxial straining obtained numerical results have shown good agreement with the experimental results.
Šiame darbe aprašomos ir nagrinejamos plastiškos poringu milteliu medžiagos (PPM) deformacijos, atliekamas skaitinis ju modeliavimas. Šis modelis leidžia prognozuoti PPM technologiniu parametru kitima plastiniu deformaciju savybese. Poringosios medžiagos vienetine lastele aprašoma aštuoniomis milteliu dalelemis. Šios vienos medžiagos lasteles parametrai formuoja poringosios terpes modeli ir apibrežia jo technologines charakteristikas. I ši modeli itraukti PPM savybiu neizotropiniai efektai. Skaičiavimai atlikti neortogonalioje koordinačiu sistemoje susietoje su vienetine lastele. Gauti skaitiniai rezultatai neašinems itampoms rodo gera atitikima eksperimentiniams matavimams.