It was experimentally found that during the passage of the impact momentum through multi-indentor impact system the distortion of energy transfer in the deformation zone is influenced by such factors as the number of indentures (waveguides), their shape and distance position relative to the impact axis. Thus, the increase in the number of indentures in the impact system, on the one hand, leads to a decrease in the proportion of energy of the impact pulse per an isolated indenter, and on the other hand allows to increase the total value of energy transfer in the deformation zone compared to one-indentor scheme. The distance increase between impact axis and indentors placement regardless of their number and form, leads to a decrease in the proportion of energy transmitted to the deformation zone.
New static-pulse treatment method was offered to increase contact pitting resistance of machinery parts. This method forms cold-worked layer with high hardness located deep in the part. The static-pulse treatment method is characterized by important feature that helps to form various levels of hardening uniformity of the surface layer. For the first time undertaken studies provided recommendations relating to uniformity of surface layer mechanical hardening, which increases contact pitting resistance of machinery parts made of 45, 40H, 35HGSA steel.
The article discusses the features of the circular economy and its disclosure in the basic concepts of improving production processes in construction. The concept of a circular economy (CE) has recently become widespread as a perspective for solving global problems such as resource scarcity and waste management. The CE concept in the construction sector is rapidly gaining momentum and is used by many participants to coordinate their plans to build a more sustainable society. However, what exactly CE entails, remains unclear, and the actors involved in the transition to the CE set different priorities depending on their capabilities and goals. The transition to CE requires a more holistic approach and concerted efforts of all parties in the construction business.
Using the finite element model of the shock system, the efficiency of the shock pulse energy transfer to the deformation zone under wave strain hardening is studied. It was established, that conducting research from the point of view of the efficiency of transferring the shock pulse energy to the deformation zone, and from the point of view of the design of the shock pulse generator, is advisable on shock systems in which the contacting ends of the striker and the waveguide have equal diameters. Studies showed that with ratios 1<L1/L2<10; 5<L1/d1<10, an increase in the fraction of the shock pulse energy transmitted to the deformation zone n exceeds 80% for the striker and waveguide with diameters of 30, 48, 60, 90 mm. According to the adopted optimization criteria, the geometrical dimensions of the striker and the waveguide are determined, which ensure the transfer of the largest amount of shock pulse energy to the deformation zone.
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