ANALYSIS OF THE STRESSED AND DEFORMED CONDITION OF POWER ELEMENTS OF THE MOUNTING OF THE MI-8 HELICOPTER REDUCER IN THE PRESENCE OF CORROSION DAMAGE
DOI:
https://doi.org/10.54858/dndia.2022-18-13Keywords:
tensely-deformed state, modeling, fatigue strength, corrosion of steel alloys, corrosion damage, sub-gear frameAbstract
The power design of the Mi-8 helicopter, as the object of study, is quite reliable, as evidenced by experience, and the glider helicopter Mi-8 is quite repairable, ie adapted to eliminate the consequences. damage, which is confirmed by the experience of repair work. But significant periods of operation, maintenance and storage, intensity of use, combat use to varying degrees contributed to corrosion damage to the structural elements of the glider, the mounting components of the Mi-8 gearbox, reducing their operational strength.
Currently, the state aviation of Ukraine requires a significant number of components for these helicopters to maintain and restore the serviceability of Mi-8 helicopters. The specified components of helicopters have been in operation for a long time, and during the last 10-15 years, the vast majority of them were in storage. During the next major repair, corrosion lesions were found on individual nodes of the main braces of the main gearbox frames of Mi-8 helicopters, which exceed the permissible values (in depth and area) determined by the Manual for Major Repair of Mi-8 Helicopters.
Corrosion damage of these nodes occurs on the end (support) part and in the hole for the bolt of the sub-reduction frame to the helicopter fuselage due to the ingress of moisture and the formation of a stagnant zone where moisture remains for a long time. After the removal of the specified corrosion lesions, the question arises about the possibility of further operation of sub-gear frames as intended.
For this, it is necessary to answer the questions about the loads that arise in operation in these nodes with corrosion lesions that exceed the permissible norms.
Therefore, the main direction of scientific research of this work is the study of the physical essence of the structure's ability to withstand without destruction and deformation the entire range of operational loads and corrosive environment under the conditions of a regulated operation process.
Achieving the goal is possible using the method of mathematical modeling of the structural elements of the glider with the presence of corrosion damage and the finite element method to calculate the stress-strain state of the main structure glider elements.
References
“Руководство по ремонту вертолетов Ми-8МТ, раздел 084.10.00. Ремонт редукторной рамы”, 2001, 305 с.
Конспект лекцій з дисципліни “Опір матеріалів” (для студентів всіх механічних спеціальностей денної і заочної форм навчання) / Укл. Л.В. Кутовий, Т.П. Зінченко і В.А. Овчаренко. – Краматорськ: ДДМА, 2007. – Ч.1. – 196 с.
История появление метода конечных элементов [электронный ресурс] – Режим доступа: www.it-nv.ru, свободный. – Загл. с экрана (дата обращения к ресурсу 09.07.2022)
Галлагер. Р. Метод конечных элементов. Основы. / перевод с анг. В.М. Картвелишвили, под ред. Н.В. Баничука – М.: Мир. 1984. – 428с.
Вертолет Ми-8МТ. Руководство по технической эксплуатации 8МТ-0007-00РЭ. Планер, издание трете,1979 210с.
Про дослідження рам головних редукторів вертольотів з метою допуску їх до подальшої експлуатації, звіт ДНДІА, 2015, 29 c.
Гудков А.И., Лешаков П.С. Внешние нагрузки и прочность летательных аппаратов. М.: Машиностроение, 1968, 470 с.
Александров В.Г. Справочник по авиационным материалам. М.: Изд-во “Транспорт”, 1972. – 320с.
Марочник сталей и сплавов. Под ред. Зубченко А.С. – М.: Машиностроение, 2003. – 784 с.
Справочник по авиационным материалам. Том 1, Том 3. – М.: Машиностроение, 1965, – З65 с.
Иосилевич Г.Б. Детали машин. – М.: Машиностроение, 1988. – 368 с.
Панасюк В.В. Деякі актуальні проблеми міцності матеріалів і довговічності конструкцій – Фізико-хімічна механіка матеріалів // 2009, № 2. – С. 5-22.
Трощенко В.Т., Сосновский Л.А. Сопротивление усталости металов и сплавов. Справочник. К.: Наукова думка, 1987. – 350с.
