Resonance occurrences in processes of vibration compaction of powder preparations
DOI:
https://doi.org/10.37142/2076-2151/2022-1(51)117Keywords:
powder mix, plastic deformation, vibroplastic effect, vibration, resonance occurrences.Abstract
Drahobetskyi V., Savielov D., Moloshtan D. Resonance occurrences in processes of vibration compaction of powder preparations
The publication considered the process of deformation of a dispersed powder mixture by a vibrating working body that carries out periodic oscillations in the vertical plane. The purpose of the work is to find ways of decreasing the size of plastic deformation work in the processes of compaction of dispersive powder media during the production of powder preparations. During the phased deformation of the powder preparation with a certain angular frequency of forced oscillations, the stress state relaxes and resonance occurrences are formed near the stress concentrators. As a result of the development of multiple sliding processes, a wave of plastic deformation is formed and a vibroplastic effect develops. It was established that knowing the frequency of periodic elementary changes of the plastic course and acting on the volume deformed by an external load with the same or a similar frequency, it is possible to coordinate the course of plastic fluidity with the nature of the application of this load and, based on the combination of two periodic processes, create a vibroplastic resonance. Vibration energy is absorbed in the defect zone of the crystal lattice. This leads to an increase in the potential energy of dislocations, a decrease in the displacement of the shearing stress, and the self-organization of the dissipative system. Obtained theoretical dependences for determining the shear resistance, energy and width of the dislocation during its movement at a certain speed, natural frequency of shearing deformation, bending axisymmetric angular momentum and momentum of momentum. In the case of deformation with a frequency that lies within the synchronization band in relation to the frequency of periodic elementary shifts of plastic yield, the degree of postoperative warping was minimal, one to two orders of magnitude less than in previous cases. It was also found that in the case of using resonance occurrences in the processes of shape change of powder preparations, a significant reduction in the deformation forces and, as a result, a reduction in the work of plastic deformation was found.
Key words: powder mix, plastic deformation, vibroplastic effect, vibration, resonance occurrences.
References
Kuznetsov V. E. On the possibility of dynamic influence on the plastic deformation of metals. Ferrous metallurgy. 1993. 5, pp. 23−26. (in Russian).
Dragobetsky V. V., Martsinyuk O. B., Trotsko O. V. Resonance phenomena in the processes of changing cast billets. Transactions of KDPU. Kremenchuk. KDPU. 2006. 6/2006 (41). P. 2, pp. 25–26. (in Russian).
Savelov D. Modelling of a powder-like work-piece compaction in a stiff die by a vibro- static method. Transactions of Kremenchuk Mykhailo Ostrohradskyi National University, KRNU, Issue 1/2015 (90), pp. 109–113 (in Russian).
Savelov D., Puzyr R., Dragobetsky V., Markevych A. Peculiarities of vibrational press dynamics with hard-elastic restraints in the working regime of metal powders molding. Metallurgical and Mining Industry. 2015. 2,
pp. 67–74. (in Russian).
Savelov D. Modelling of the deformation process for dispersible and porous powder-like work-pieces. Transactions of Kremenchuk Mykhailo Ostrohradskyi National University, KRNU, 3/2015 (92), pp. 74–78 (in Ukrainian).
Savelov D. V., Markevich A. G. Baglyuk G. A. Improvement of technology and equipment for intensification of the process of vibration-static pressing of metal powders. Powder metallurgy: surface engineering, new powder composite materials. Welding. Collection of reports 9 international symposium April 8-10, 2015. Minsk: Belarusian Science, pp. 196–206. (in Russian}.
Maslov O., Savielov D., Salenko Y., Javadova M. (2022) Theoretical Study of the Dynamic System «Vibration Platform − Polymer Concrete» Stress–Strain State. Proceedings of the 3rd International Conference on Building Innovations. ICBI 2020. Lecture Notes in Civil Engineering, vol 181. Springer. Cham, pp 191–201. https://doi.org/10.1007/978-3-030-85043-2_19.
Klimenko V.M., Shapoval V.N. Vibration processing of metals by pressure. Kiev: Equipment. 1977. 128 p. (in Russian).
