مجله مهندسی مکانیک

مجله مهندسی مکانیک

تحلیل ارتعاشات میکروورق های مدرج تابعی دو جهته با لحاظ کردن اثر اندازه بر اساس تئوری ردی

نوع مقاله : علمی پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، گروه مهندسی مکانیک، دانشگاه آزاد اسلامی واحد داریون، داریون
2 استادیار، گروه مهندسی مکانیک، دانشگاه آزاد اسلامی واحد داریون، داریون
چکیده
تاکنون هیچ پژوهشی جهت بررسی رفتار مکانیکی سازه‌ های کامپوزیتی مدرج تابعی دو جهته گزارش نشده است. در این مقاله، ارتعاشات آزاد میکروورق های مدرج تابعی دو جهته با استفاده از تئوری تنش کوپل اصلاح شده و تئوری بهینه یافته ردی برای اولین بار بررسی شده است. فرض می ‌شود که تمام خواص مکانیکی به جز نسبت پواسون در امتداد عرض و ضخامت طبق توابع غیر خطی تغییر می کنند. به منظور در نظر گرفتن پارامتر اثر اندازه از تئوری تنش کوپل اصلاح شده استفاده شده است. معادلات حرکت با در نظر گرفتن اثرات برشی با استفاده از اصل همیلتون به دست آمده و سپس به روش نویر، معادلات حل شده است. پس از حل معادلات، فرکانس های ارتعاشی ورق مورد تحلیل قرار گرفته و تأثیرات پارامترهایی مثل ابعاد میکروورق و اثرات اندازه بر روی فرکانس طبیعی آن مورد تحلیل قرار گرفته است. نتایج ارائه شده می ‌تواند به عنوان معیارهایی برای تحلیل مکانیکی سازه‌ های کامپوزیتی دو بعدی و سه بعدی مدرج تابعی در آینده مورد استفاده قرار گیرد.
کلیدواژه‌ها
موضوعات

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  • تاریخ دریافت 20 خرداد 1404
  • تاریخ بازنگری 22 مهر 1404
  • تاریخ پذیرش 19 آبان 1404