بررسی تجربی و عددی عدم تقارن در صفحات دوپایداری هیبریدی برای استفاده در سازه‌های تطبیق‌پذیر

نوع مقاله : مکانیک جامدات

نویسندگان

1 گروه سازه های هوافضائی، دانشکده مهندسی هوافضا، دانشگاه صنعتی امیرکبیر

2 استاد گروه سازه های هوافضائی/ دانشکده مهندسی هوافضا/ دانشگاه صنعتی امیرکبیر

3 مرکز فنی و مهندسی بوئین‌زهرا-دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران

چکیده

یکی از انواع سازه‌های تطبیق‌پذیر، صفحات مرکب دو یا چند پایداری هستند که با اعمال بارگذاری قادر به تغییرشکل و حفظ، حالت پایداری خود هستند. در این مقاله به بررسی رفتار صفحات مرکب دوپایداری هیبریدی شامل یک‌لایه آلومینیوم در یک طرف آن به‌عنوان روشی جدید برای ایجاد عدم تقارن در دوپایداری و در نتیجه کنترل‌پذیری صفحات دوپایداری پرداخته شده و نتایج مورد ارزیابی تجربی و عددی قرار گرفته است. در همین راستا، تغییرشکل صفحه در دو حالت پایداری و برای دو صفحه با لایه آلومینیوم (هیبریدی) و بدون لایه آلومینیوم، مقایسه شده است. در ادامه، میزان تغییرات انرژی کرنشی با تغییر دمای محیط و مدت‌زمان سرد شدن مورد بررسی قرار گرفته است. نتایج این تحقیق نشان می­دهد، اضافه‌کردن لایه آلومینیوم می‌تواند ضمن ایجاد بستری برای اتصال عملگرهای پیزوالکتریک، آلیاژهای حافظه‌دار و اعمال تغییرشکل از طریق تغییرات دمایی، در صورت اتصال به صفحات دیگر، منجر به پیوستگی در مرزهای ناپیوسته شده و گزینه­ای مناسب برای ایجاد تغییرشکل‌های پیوسته در سازه‌های هوافضایی نظیر انعکاس‌دهنده‌های رادیوئی و سطوح کنترل پرواز باشند.

کلیدواژه‌ها

عنوان مقاله [English]

The Experimental and Numerical Investigation of Non-Symmetric Bi-Stability in Hybrid Composite Plates for Application in Adaptive Structures

نویسندگان [English]

  • Mahdi Fazli 1
  • Mohammad Homayoun Sadr 2
  • hadi ghashouchi 3
1
2 Aerospace engineering faculty/Amirkabir university of technology
3 -
چکیده [English]

Bi-stable or multi-stable composite laminate is one of the adaptive structures that keep their stable states and modify their shapes by load application. This paper investigates the out of plane displacement of bi-stable hybrid composite laminate with an AL layer on one side. Adding the AL layer is a novel approach, introduced to create an asymmetric bi-stability that leads to a better control of the structure and the results are evaluated experimentally and numerically.  In this regard, the deformation of plates in two stable states, with and without the AL layer (hybrid) coating have been compared. Also, the strain energy changes with room temperature and cooling time have been investigated. Adding an aluminum layer can create a platform for connecting piezoelectric actuators, memory alloys, and thermal actuators. If these laminates are connected to other symmetric or asymmetric laminates, it is possible to create continuity over the discontinuous borders and decrease the stress concentration. These laminates are suitable devices for continuous modification of the shape of aerospace structures like reflector antennas and flight control surfaces.

کلیدواژه‌ها [English]

  • Bi-Stable Composite Laminates
  • Adaptive Structures
  • Hybrid Composite Laminate

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سابقه مقاله

  • تاریخ دریافت: 13 مرداد 1399
  • تاریخ بازنگری: 09 اسفند 1399
  • تاریخ پذیرش: 20 بهمن 1400
  • تاریخ انتشار: 01 بهمن 1400

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