Вільні коливання функціонально-градієнтних наноармованих циліндричних оболонок
Рубрика:
| Аврамов, КВ, Чернобривко, МВ, Успенський, БВ |
| Косм. наука технол. 2019, 25 ;(2):23-37 |
| https://doi.org/10.15407/knit2019.02.023 |
| Мова публікації: Українська |
Анотація: Останнім часом у світовому ракетобудуванні все частіше на заміну металам та їхнім сплавам приходять полімерні композитні матеріали, що армовані вуглецевими нанотрубками, так звані нанокомпозити. Це пов’язано з тим, що в умовах робочих високоін- тенсивних навантажень при однаковій вазі нанокомпозити мають значну перевагу над алюмінієвими сплавами за своїми механіч- ними характеристиками міцності. Циліндричні нанокомпозитні корпусні елементи ракет можуть бути армовані вуглецевими нанотрубками з різним розподілом їх по товщині матриці. В даний час існує п’ять основних типів наноармування, які призводять до виникнення функціонально-градієнтного матеріалу по товщині оболонки. При аналізі коливань елементів ракетно-космічної техніки необхідно розглядати можливість резонансу між конструкцією та аеродинамічними навантаженнями. Невід’ємною частиною такого аналізу є аналіз вільних коливань оболонки, який проводиться з метою визначення та запобігання небезпечних резонансних режимів. Класичні моделі коливань циліндричних оболонок не дозволяють враховувати зміну властивостей матеріалу по товщині. У даній роботі запропоновано метод аналізу вільних коливань функціонально-градієнтних нанокомпозитних циліндричних оболонок, які можуть бути складовою частиною ракетних комплексів і конструкцій літаків. Розглянуто залежності параметрів
коливань від типу наноармування, об’ємної частки нанотрубок в композиті та товщини оболонки. Результати аналітичного дослідження порівнюються з чисельним моделюванням методом скінченних елементів. Запропонована модель враховує зміну властивостей матеріалу по товщині оболонки для кожного з п’яти випадків наноармування. Показано, що відбудова нанокомпозитних оболонок від резонансних режимів може здійснюватися шляхом раціонального вибору типу армування вуглецевими нанотрубками. |
| Ключові слова: вільні коливання, власні частоти, нанокомпозит, нанотрубка, функціонально-градієнтний матеріал, циліндрична оболонка |
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