Міцність та експлуатаційна надійність біметалевих контактних термоперетворювачів

• Datum: 2023
• Hauptverfasser: Дробенко, Богдан, Бардин, Тетяна
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Інститут прикладних проблем механіки і математики ім. Я. С. Підстригача НАН України 2023
• Schlagworte: комп’ютерне моделювання; метод скінченних елементів; напружено-деформований стан; міцність; експлуатаційна надійність
• Online Zugang: https://www.fmmit.lviv.ua/index.php/fmmit/article/view/342
• Назва журналу: Physico-mathematical modeling and informational technologies

As a result of different physical and mechanical characteristics of the components, the bimetallic contact thermoconverter deforms when heated, and its displacement carry information about the measured temperature of an object or environment. However, thermal stresses often lead to a violation of the bond strength between the component plates of the thermoconverter and cause a partial or complete break between them. In order to increase the operational reliability of the thermometric system, it is proposed to make a gap between the plates, to make the plate with a higher coefficient of thermal expansion in the form of sections that abut against the edges made on a plate with a lower coefficient of thermal expansion, thanks to which the thermoconverter maintains its integrity. Due to this structural design, the thermoconverter has significantly higher reliability and performance under long-term cyclic heat load. Using the means of mathematical and computer modeling within the limits of the theory of thermoelasticity, the strength of the proposed design of the bimetallic heat exchanger was investigated. It is shown that due to such a design, the thermoconverter maintains its integrity up to temperatures of the order of 850 °C.