Modeling of the product termomechanical behavior during 3D deposition of wire materials in ANSYS
Additive technologies allow to produce products due to the layer-by-layer synthesis and obtain products of a complex shape. The numerical modeling of the physical process of manufacturing parts using additive technologies is complex and needs to consider a variety of thermomechanical behavior. This is connected to the extensive use of the finite element computer simulation by means of specialized software packages that implement mathematical models of the processes. The paper considers the algorithm of calculating nonstationary temperature fields and stress-strain state of the structure during the 3D deposition of wire materials developed and implemented in ANSYS. The verification of the developed numerical algorithm is carried out to solve the three-dimensional problem related to the production of metal products using arc 3D deposition of wire materials with the results of the experiment. The problem is divided into the boundary value problem of nonstationary heat conductivity and thermomechanics boundary value problem of stress-strain state that are uncoupled. For its solution the technology of “killing” and subsequent “birthing” is used (it is realized in ANSYS). Continuous building of the material is made discretely on each step of calculation corresponding to “birthing” of the next subarea from "dead" elements, the boundary problem of heat conductivity and thermomechanics is solved. And the result of solving the previous step is the entry conditions for the next step. The Anand's model is used for the description of the viscoelastoplastic behavior of the studied alloy. Identification of the Anand's model for the studied material was carried out according to the stretching experiment with the set speed at various temperatures. The data obtained from the calculations on the developed numerical model are in good agreement with the experiment.