Vibrations in engineering and technology

Morachkovskii Oleg – Doctor of Technical Sciences, Professor, Head of the Department «Theoretical Mechanics» of National Technical University  «KhPI» (Kyrpychova St., 2, Kharkiv, Ukraine, 61002, e-mail: morachko@ukr.net).

Lavinskii Denis – Candidate of Technical Sciences, docent, docent of the Department «Theoretical Mechanics» of National Technical University  «KhPI» (Kyrpychova St., 2, Kharkiv, Ukraine, 61002, e-mail: denis.lavinsky@ukr.net

The article deals with issues related to the calculation of electromagnetic fields (EM-fields) and the stress-strain state (SSS) of composite structures, taking into account contact deformation. A large number of technical and technological facilities work under the action of EM-fields. In some cases, the force action of the electromagnetic field is so significant that it can cause irreversible deformation or destruction of the elements. Electromagnetic forming (EMF) is one of the most striking examples of the force action of an EM-field. The efficiency of the technological operation of EMF is determined on the one hand by the efficiency of the inductor and on the other hand by the appearance in the workpiece of inelastic deformations. The calculation estimates of the inductor performance and inelastic deformation of the workpiece can be carried out on the basis of the distribution of the characteristics of the SSS. This work illustrates the implementation of such estimates for one class of technological systems consisting of a composite multi-turn inductor with an auxiliary screen, which is considered together with a workpiece that has a dent. The problem was solved by a numerical method, which is based on the finite element method. The peculiarities of contact interaction were taken into account by introducing layers of contact elements. The distribution of the components of the SSS is obtained taking into account the distribution of the EM-field in the quasi-stationary approximation for the time maximum. The rational values of some design and operational characteristics of the technological system are defined.

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