|
ИСТИНА |
Войти в систему Регистрация |
ФНКЦ РР |
||
Экспериментальное определение функции поврежденности в кинетической модели ползучести Ю.Н. Работновастатья
- Авторы: Фомин Л.В., Кузнецов В.Н.
- Сборник: Избранные труды конференций XXI Международная инновационно-ориентированная конференция молодых ученых и студентов по современным проблемам машиноведения (МИКМУС-2009)
- Год издания: 2010
- Место издания: Институт машиноведения имени А.А. Благонравова ИМАШ РАН. Москва
- Первая страница: 126
- Последняя страница: 132
- Аннотация: Abstract. To describe a creep process taking into account the third stage (the stage of increasing rate), Yu. N. Rabotnov’s kinetic creep theory is used in many instances. Damage function ω plays the key role in this theory, for which a respected differential equation is formulated. In this work the damage function is for the first time determined from a series of creep tests, and on the basis of the kinetic creep theory a mathematical model of creep processes is formulated taking into account the third stage of the process. An algorithm is implemented where the entire set of experimental curves is approximated by one analytic expression but with different approximation coefficients which are assumed to be dependent on stressσ . Therefore, the formulated mathematical model includes Rabotnov’s kinetic creep theory where the damage function ω is determined experimentally and satisfies a differential equation agreed with the creep equation; whereas creep curves are given by analytic approximation where the coefficients depend on stress. The model allows the creep curve to be calculated up to destruction at any stress value σ and given temperature T on the basis of available experimental data. The method is illustrated by an example of real creep curves processing. A good match between the experimental results and model calculations is achieved.
- Добавил в систему: Фомин Леонид Викторович