## 4 Conclusions  
During the work, we established the fact that the data on the thermal and viscoelastic properties of PEEK presented in the literature are not quite adequate for additive manufacturing due to results presented being obtained at room temperature under loading conditions that are not typical for the deposition process. For this reason, our own DMA  
Figure 21: Demonstration of the refining of the mechanism of energy supply to the system: (**a**,**b**)—the time of the end of the cooling of the first layer and the instantaneous heating of the second layer of plate material, respectively, before correction; (**c**,**d**)—the same, after correction. Figure 20: Supply of energy to the system without heat exchange between the sample and the medium: (**a**) before correction; (**b**) after it. Three hundred seconds is the waiting time for the thermal state of the platform to reach the stationary mode. experiment was carried out to determine the numerical values of the temperature dependence function of the complex relaxation modulus in a wide temperature range. Using the ANSYS APDL language, our own parameterized algorithm was developed for calculating non-stationary temperature fields and the stress-strain state of PEEK products during their manufacturing using a wire-based deposition method (FDM). The influence of the degree of detailing of the heat source trajectory and the method of connecting the sample to the platform on the quality of the solution is analyzed. The heat supply mechanism was debugged, and the estimated time was coordinated with an increase in the detailing of the heat source trajectory by taking into account the heat balance. As part of the analysis of the results of the numerical simulation, a good agreement between the calculated data and the experiment was shown. As a result of the study of the thermomechanics of the additive manufacturing of PEEK products, the following has been found:  
1. The Prony viscoelastic model is suitable as a model for describing PEEK during hardening;  
2. The literature data do not make it possible to numerically obtain results close to the full-scale experimental ones. The constants obtained from our own DMA experiment give a qualitative solution. In addition, the results of the DMA experiment demonstrate a smoother transition of the material from the highly elastic to the glassy state and indicate that the sample cooling rate does not affect its thermomechanical behavior;  
3. Contact elements in the sample-platform zone minimize the calculated errors and allow taking into account the adhesion force in the contact zone; therefore, they are better suited for modeling sticking with the subsequent detachment of the sample from the platform;  
4. The application of temperature to the common nodes of the adjacent sections of the plate material leads to the supply of excess heat to the system with the instantaneous heating of the \"alived\" section. You can fix this by creating additional nodes near the common ones. 5. Significant reduction in the detailing of the heat source trajectory leads to a great error in the solution. At present, it is planned to carry out identification tests for shear and verification experiments on shell growth, which will allow us to assess the acceptability of the hypothesis of a constant bulk modulus. Conceptualization, D.N.T. and O.Y.S. ; methodology, O.Y.S., A.A.A. and D.N.T. ; software, O.Y.S. and A.A.A. ; validation, O.Y.S. ; formal analysis, O.Y.S. and A.A.A. ; investigation, O.Y.S., A.A.A., A.A.O. and A.A.L. ; resources, O.Y.S. and D.N.T. ; data curation, O.Y.S., A.A.A. and A.A.L. ; writing--original draft preparation, O.Y.S., A.A.A. and A.A.O. ; writing--review and editing, A.A.O. and A.A.A. ; visualization, O.Y.S., A.A.A. and A.A.L. ; supervision, D.N.T. and O.Y.S. ; project administration, D.N.T. ; funding acquisition, D.N.T. All authors have read and agreed to the published version of the manuscript. The authors gratefully acknowledge financial support under the Mega-Grants Program, Contract no.