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Information × Registration Number 0223U002484, 0122U002367 , R & D reports Title Development of mathematical models and methods of numerical modeling of thermomechanical processes for 3D printing of structural elements made of thermoelastic-viscoplastic materials popup.stage_title Head Karnaukhov Vasyl H., д.ф.-м.н. Registration Date 21-02-2023 Organization S.P. Tymoshenka Institute of Mechanics of the National Academy of Sciences of Ukraine popup.description2 Object of study - build-up objects - prismatic and laminate parts during multilayer build-up in the process of 3D-printing, models of thermo-viscoplastic deformation that take into account the phase composition of the material, thermokinetic diagrams of microstructural transformations of the build-up material, current and residual deformation and stress state during build-up. The aim of the work is to digitize thermokinetic diagrams of microstructural transformations and specify the parameters of a unified flow model, considering the influence of phase composition on the thermomechanical properties of metals used to manufacture structural elements in 3D printing, to develop models of microstructural transformations (crystallization) and models of thermo-viscoselasticity that take these transformations into account for polymeric materials used in 3D printing. The numerical study of 3D printing processes uses the method of time step integration, the method of iteration, and the finite element method. The build-up is modeled using a model of growing bodies. Mathematical models of thermomechanical behavior of metallic and polymeric materials with taking into account microstructural transformations are developed. New results are obtained. The parameters of the Bodner-Partom flow model for selected materials are specified with account of phase transformations. A multilayer build-up model was developed, which is the basis for modeling thermomechanical processes in 3D printing of inelastic structural elements. The thermomechanical processes during the growth of prismatic elements are numerically investigated and recommendations on the process parameters are given to reduce residual deflections and stresses. The results of the research can be used to improve 3D printing technologies in such areas of social practice as medicine, consumer goods manufacturing, housing, and industrial construction, etc.  Product Description popup.authors Zhuk Yaroslav O. Zinchuk Lubov P. Karnaukhov Vasyl Havrylovych Kyrychok Ivan F. Kozlov Volodymyr Illich Lelyukh Yuriy Ivanovich Petrenko Natalіa V. Senchenkov Ihor Kostjantynovich Chervinko Olha P. Yakovenko Nina D. popup.nrat_date 2023-02-21 Close