علوم و فناوری فضایی

علوم و فناوری فضایی

تئوری لایروایز برای تحلیل ارتعاشات آزاد و پنل فلاتر چندلایه‌های کامپوزیتی با سفتی متغیر به روش حل عددی آیزوژئومتریک

نوع مقاله : مقالة‌ پژوهشی‌

نویسندگان
1 دانشجوی دکترا، دانشکده مهندسی هوافضا- دانشگاه علوم و فنون هوایی شهید ستاری- تهران- ایران
2 استادیار، دانشکده مهندسی هوافضا- دانشگاه علوم و فنون هوایی شهید ستاری- تهران- ایران
3 استاد، دانشکده مهندسی هوافضا- دانشگاه علوم و فنون هوایی شهید ستاری- تهران- ایران
چکیده
در این پژوهش تحلیل ارتعاشات آزاد و پنل فلاتر چندلایه‎های کامپوزیتی دارای الیاف منحنی‌شکل با رویکرد حل عددی آیزوژئومتریک با استفاده از تئوری لایروایز ارائه می‌گردد. با توجه به کاربرد گسترده سازه‌های ساخته‌شده از مواد مرکب در صنایع هوافضا و مکانیک، از ورق‌های کامپوزیتی با سفتی متغیر به‌منظور کنترل خواص مکانیکی مطلوب و طراحی کارآمدتر استفاده گردید. به‌منظور افزایش دقت پاسخ نسبت به تئوری تک‌لایه‌ی معادل و نیز افزایش سرعت محاسباتی نسبت به مدل الاستیسیته سه‌بعدی، از تئوری لایروایز فریرا به همراه فرضیات تئوری برش مرتبه اول برای فرض میدان جابجایی بهره گرفته شده است. در ادامه، با استفاده از روش انرژی و اصل کار مجازی و با فرض تئوری پیستون مرتبه اول برای شبیه‌سازی فشار آیرودینامیک، معادلات حاکم برای ارتعاشات آزاد و پنل فلاتر ورق استخراج گردید. گسسته‌سازی هندسه با روش حل عددی آیزوژئومتریک صورت پذیرفت که در آن از توابع پایه نربز مکعبی که برای مدل‌کردن دقیق هندسه بکار می‌رود، همزمان به عنوان تابع تقریب در فرمولبندی اجزای محدود نیز استفاده شده است. نتایج عددی از حل مساله مقدار ویژه بدست آمد و پارامترهای مختلفی از جمله نوع چیدمان، میزان انحنای الیاف، شرایط مرزی و نسبت‌های ابعادی در صفحات کامپوزیتی با الیاف منحنی ارائه گردیده است. مقایسه نتایج به‌دست‌آمده با نتایج دیگر پژوهش‌ها انطباق خوبی دارد و دقت و کارایی فرمولبندی ارائه‌شده را نشان می‌دهد.
کلیدواژه‌ها
موضوعات

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دوره 18، شماره 4
1404
صفحه 32-47

  • تاریخ دریافت 30 مرداد 1404
  • تاریخ بازنگری 14 مهر 1404
  • تاریخ پذیرش 15 مهر 1404
  • تاریخ اولین انتشار 22 مهر 1404