DOI: https://doi.org/10.32515/2664-262X.2022.6(37).1.30-36

Increasing the Safety Margin of Threaded Connections Operating Under Variable Loads

Yurii Nevdakha, Volodymyr Pirogov, Nataliia Nevdakha, Liubov Olijnichenko, Mykhailo Vasylkovsky

About the Authors

Yurii Nevdakha, Associate Professor, PhD in Technics (Candidate of Technics Sciences), Central Ukraіnian National Technical University, Kropyvnytskyi, Ukraine, e-mail: uanevdakha@ukr.net, ORCID ID: 0000-0003-4355-4065

Volodymyr Pirogov, Associate Professor, PhD in Technics (Candidate of Technics Sciences), Central Ukraіnian National Technical University, Kropyvnytskyi, Ukraine, e-mail: pirogovvv@ukr.net, ORCID ID: 0000-0002-5843-4552

Nataliia Nevdakha, Head of the laboratory, Central Ukraіnian National Technical University, Kropyvnytskyi, Ukraine

Liubov Olijnichenko, PhD in Technics (Candidate of Technics Sciences), Central Ukraіnian National Technical University, Kropyvnytskyi, Ukraine, e-mail: loga_lubov@ukr.net, ORCID ID: 0000-0001-9351-6265

Mykhailo Vasylkovsky, student, Central Ukraіnian National Technical University, Kropyvnytskyi, Ukraine

Abstract

One of the most common types of plug-in connections are threaded connections. In any machine, unit, the number of parts of threaded connections (bolts, studs, nuts, washers, etc.) is calculated by dozens and hundreds of pieces. It follows from this that the issue of designing and calculating threaded connections is of great importance in the design of machines and devices. One of the most important elements of bolts and screws is the thread, which is the surface of the protrusion formed during the helical movement of an arbitrary flat contour on the side surface of a cylinder or cone. Threaded connections are widely used in various mechanisms (internal combustion engines, etc. products). Their use is due to simplicity, high load-bearing capacity, reliability, as well as the convenience of connecting and disconnecting parts. The calculation of tightened threaded connections operating under alternating stresses is a check calculation. Based on the simplified statement of the problem, the preliminary dimensions of the main elements of the threaded connection are determined. Then the layout of the connecting node is carried out, and after the design is fully determined, they begin to perform the verification calculation. In recent times, we have seen an increase in the interest of designers in the calculations of threaded connections operating under variable stresses. This is explained by the fact that in most mechanisms, in particular in the automotive industry, threaded connections work under variable stresses, but an incorrectly determined margin of strength of threaded connections leads to breakdowns and destruction of mechanisms. Thus, there is a need to study more accurate calculation formulas for determining the margin of strength of threaded connections, which is the result of a verification calculation.

Keywords

threaded connections, bolt, load, margin of safety, bearing capacity, reliability

Full Text:

PDF

References

1. Ivanov, M.N. (1984). Detali mashin [Machine details]. (4d ed.). Moskow: Vyssh. shk. [in Russian]

2. Nevdakha, Yu.A., Malomuzh, H I. & Khioni, V.Z. (2006). Doslidzhennia mitsnosti elementiv riz'by [Study of the strength of threaded elements]. Zbirnyk naukovykh prats' Kirovohrads'koho natsional'noho tekhnichnoho universytetu. Tekhnika v sil's'kohospodars'komu vyrobnytstvi, haluzeve mashynobuduvannia, avtomatyzatsiia – Collection of scientific works of the Kirovohrad National Technical University. Machinery in agricultural production, industrial engineering, automation, Issue 17, 219-222 [in Ukrainian]

3. Pavlishhe, V.T. (1993). Osnovi konstrujuvannja ta rozrahunok detalej mashin [Fundamentals of design and calculation of machine parts]. Kiev: Vishha shkola [in Russian]

4. Reshetov, L.N. (1989). Detali mashin [Machine details]. (4d ed.). Moskow: Mashinostroenie [in Russian]

5. Guzenkov, P.G. (1982). Detali mashin [Machine details]. Moskow: Vysshaja shkola [in Russian]

6. Buklagin, D.S. & Golubev, I.G. (2003). Spravochnik inzhenera po tehnicheskomu servisu mashin i oborudovanija v APK [Handbook of the engineer on technical service of machines and equipment in the agricultural industry]. Moskow: FGNU «Rosinformagroteh» [in Russian]

7. Tehnologicheskie karty po tehnicheskaomu obsluzhivaniju i tekushhemu remontu avtomobilja KamAZ tipa [Technological cards for technical maintenance and current repair of a KamAZ type car]. (1992). Moskow: Mashinostroenie [in Russian]

Citations

  1. Иванов М.Н. Детали машин: учебн. для машиностр. спец. вузов . 4-е изд., перераб. М.: Высш. шк., 1984. 336 с.
  2. Невдаха Ю.А., Маломуж Г І., Хіоні В.З. Дослідження міцності елементів різьби . Техніка в сільськогосподарському виробництві, галузеве машинобудування, автоматизація: зб. наук.праць Кіровоградського нац. техн. ун-ту. 2006. Вип. 17. С. 219-222.
  3. Павлище В.Т. Основи конструювання та розрахунок деталей машин. Київ: Вища школа, 1993. 356 с.
  4. Решетов Л.Н. Детали машин: учебн. для студ. Машиностроительных и механических спец. вузов. 4-е изд., перераб. и доп. М.: Машиностроение, 1989. 496 с.
  5. Гузенков П.Г. Детали машин: учебн. для машиностр. спец. вузов. М.: Высшая школа, 1982. 351 с.
  6. Буклагин Д.С., Голубев И.Г. Справочник инженера по техническому сервису машин и оборудования в АПК. М.: ФГНУ «Росинформагротех», 2003. 604 с.
  7. Технологические карты по техническаому обслуживанию и текущему ремонту автомобиля КамАЗ типа. М.: Машиностроение, 1992. 360 с.
Copyright (c) 2022 Yurii Nevdakha, Volodymyr Pirogov, Nataliia Nevdakha, Liubov Olijnichenko, Mykhailo Vasylkovsky