نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، طراحی کاربردی، دانشگاه آزاد اسلامی واحد تهران جنوب، تهران، ایران

2 استادیار، مهندسی مکانیک، دانشگاه آزاد اسلامی واحد تهران جنوب، تهران -ایران

چکیده

در این تحقیق، رفتار ضربه شارپی پانل ساندویچی با لحاظ مواد خودترمیم در آن، مورد بررسی قرار گرفته است. پانل ساندویچی شامل پوسته‌ کامپوزیتی الیاف کربن با چیدمان متقارن (0/90) در قسمت بالا و پایین و هسته جامد از فوم PVC بین آنها می‌باشد. مواد خودترمیم درون لوله‌های نازک شیشه‌ای پرشده و بین لایه‌های کامپوزیت پانل ساندویچی قرار داده شده‌اند. ساخت پانل ساندویچی به روش لایه‌چینی دستی بوده که از اپوکسی برای اتصال لایه‌ها نیز استفاده شده است.
مواد خودترمیم دارای سه کسر حجمی 0.5، 1 و 1.5 درصد هستند که در بین لایه‌های کامپوزیتی پانل ساندویچی بکار گرفته شده‌اند. تخریب پانل ساندویچی با لحاظ مواد خودترمیم توسط دستگاه خمش سه نقطه‌ای انجام شده است. پس از تخریب، ترمیم آغاز شده و مدت زمان‌های صفر، سه و هفت روز برای تاثیر مواد خودترمیم پانل ساندویچی در نظر گرفته شده است. نمونه‌ها تحت آزمایش ضربه شارپی در مدت زمان‌های مذکور قرار گرفته و تاثیر مواد خودترمیم برروی رفتار ضربه پانل ساندویچی مورد ملاحظه قرار گرفته است.
نتایج تجربی رفتار ضربه شارپی پانل ساندویچی با لحاظ مواد خودترمیم بیانگر این است که بیشترین میزان چقرمگی شکست دینامیکی و بازدهی ترمیم متعلق به نمونه با کسر حجمی 1.5 درصد پس از گذشت هفت روز از زمان تخریب در مقایسه با نمونه شاهد می‌باشد. بکارگیری لوله‌های شیشه‌ای خود به‌تنهایی موجب افزایش استحکام سازه ساندویچی به میزان چشمگیری می‌شوند و تعداد لوله‌ها در افزایش استحکام سازه موثر است. با افزایش کسر حجمی و زمان ترمیم، بازدهی ترمیم پانل ساندویچی افزایش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Investigation of Dynamic Behavior of Composite Sandwich Panel Using Self-healing Materials under CHARPY impact and 3-point Bending Destruction

نویسندگان [English]

  • Navid Jalalian Mirzapour 1
  • mehdi Yarmohammad Tooski 2

1 Department of Mechanical Engineering, Islamic Azad University South Branch, Tehran, Iran

2 Department of Mechanical Engineering, Islamic Azad University South Branch, Tehran, Iran

چکیده [English]

In this research, CHARPY impact behavior of sandwich panel using the self-healing materials is considered. The sandwich panel consists of a PVC solid foam core between Carbon fibers composite faces with lay-up (0/90)s at the top and down structure. The thin glass tubes are filled by the self-healing materials and put among the composite layers of sandwich panel. The sandwich panel construction is made of handy lay-up, using Epoxy to bond the layers.
The self-healing materials with (0.5, 1, 1.5) volume fraction are used among composite layers of sandwich panel. The destruction of sandwich panel using the self-healing materials is carried out by three point bending. After destruction, the healing will be started from zero point then 3 to 7 days have been considered to determine the effect of the self-healing materials of sandwich panel. CHARPY impact test are performed on the specimens at the mentioned time to investigate the effect of the self-healing material on the impact behavior of sandwich panel.
The experimental results of CHARPY impact behavior of sandwich panel considering the self-healing materials illustrates that the most dynamic fracture toughness and healing efficiency belong to the specimen with 1.5 volume fraction after 7 days from destruction time comparing the control specimen. Using glass tubes particularly and the quantity of tubes also will be significant effect on increasing the strength of construction. By increasing the volume fraction and the time of healing, the healing efficiency of sandwich panel will be enhanced as well.

کلیدواژه‌ها [English]

  • sandwich panel
  • Composite
  • Self-healing
  • Charpy impact
  • volume fraction

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