علوم و فناوری کامپوزیت

بررسی تأثیر سیم حافظه‌دار بر رفتار بالستیکی ساندویچ پنل هوشمند با هسته موجدار

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا ، مهندسی مکانیک ، دانشگاه آزاد اسلامی واحد تهران جنوب ، تهرا ن.

2 استاد ، مهندسی مکانیک ، دانشگاه صنعتی خواج ه نصیرالدین طوسی ، تهرا ن.

3 استاد، دانشکده مهندسی و علم مواد ، دانشگاه صنعتی خواج ه نصیرالدین طوسی ، تهرا ن.

چکیده

در این مطالعه، رفتار ساندویچ پنل هسته ذوزنقه‌ای آلومینیومی با پوسته‌های کامپوزیتی شیشه/اپوکسی تقویت شده با آلیاژ حافظه‌دار تحت بار ضربه‌ای سرعت بالا، بصورت تجربی و عددی مورد بررسی قرار گرفته است. نمونه‌های کامپوزیتی جهت انجام آزمایش‌های کشش، فار و برش ساخته شدند و خواص مورد نیاز از آزمایش‌ها به دست آمد. سپس سازه‌های ساندویچی با هسته موجدار آلومینیومی و پوسته‌های 4 لایه کامپوزیت شیشه‌ای/اپوکسی با استفاده از روش لایه‌چینی دستی ساخته شد. به منظور تقویت پوسته‌های کامپوزیتی، از سیم آلیاژ حافظه‌دار در سه حالت، سه سیم بدون پیش کرنش، سه سیم با 3% پیش کرنش و سه سیم با 6% پیش کرنش استفاده شده است. نمونه‌ها تحت آزمایش ضربه سرعت بالا به وسیله تفنگ گازی قرار گرفتند. برای اعتبارسنجی و مقایسه نتایج، مدل‌های عددی نمونه‌ها در نرم‌افزار LS-Dyna با در نظر گرفتن شرایط آزمایش تجربی تهیه شد. نتایج شامل سرعت محدود بالستیک و انرژی جذب شده توسط سازه با راه حل‌های تجربی مقایسه و اعتبارسنجی شد. هدف از انجام این مطالعه، بررسی اثر افزودن سیم آلیاژ حافظه‌دار به جهت تقویت پوسته‌ها و تأثیر پیش کرنش بر رفتار بالستیکی سازه ساندویچی بوده است. نتایج بدست آمده نشان می دهد که وجود سیم آلیاژ حافظه‌دار و اعمال پیش کرنش باعث افزایش میزان جذب انرژی می‌شود. میزان جذب انرژی در مقایسه با نمونه بدون سیم، در نمونه 3 سیم بدون پیش کرنش تقریبا 10%، در نمونه 3 سیم با 3 درصد پیش کرنش تقریبا 22% و در نمونه 3 سیم با 6 درصد پیش کرنش تقریبا 30% افزایش یافته است.

کلیدواژه‌ها

عنوان مقاله [English]

The effect of Shape memory wire on the ballistic behavior of smart corrugated core sandwich panels

نویسندگان [English]

  • Roham Maher 1
  • Seyed Mohammad Reza Khalili Khalili 2
  • Reza Eslami-Farsani 3

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

2 Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran.

3 Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran.

چکیده [English]

In this research, the impact behavior of trapezoidal corrugated core sandwich panel reinforced with SMA wires, has been investigated experimentally and numerically. Composite specimens were made to perform tensile, compression and shear tests, and the requisite properties were acquired from the tests. Then, sandwich structures with aluminum corrugated core and 4-layer glass/epoxy composites face-sheets were made using the hand-layup technique. In order to reinforce the composite face-sheets, SMA wires were used in two models: 3 SMA wires without pre strain, 3 SMA wires with 3% pre-strain and 3 SMA wires with 6% pre-strain. The test was performed using a gas gun. To validate and compare the results, the numerical models of the specimens were prepared in LS-Dyna, considering the experimental testing conditions. The results, including ballistic limited velocity and the absorbed energy of the structure were compared and validated by the experimental solutions. The aim of this study was to investigate the effect of adding shape memory alloy wire to reinforce the face-sheets and the effect of pre strain on the ballistic behavior of the sandwich structure. The results shows that presence of the SMA wires and applying pre-strain, leads to increasing energy absorption. Comparing to the wireless sample, the absorbed energy increased about 10%, 22% and 30% in the 3-wires sample without pre-strain, 3-wires sample with 3% pre-strain and 3-wires sample with 6% pre-strain, respectively.

کلیدواژه‌ها [English]

  • High Velocity Impact
  • Sandwich Panel
  • Corrugated core
  • Smart composite Face-sheet
  • Shape Memory Alloy
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علوم و فناوری کامپوزیت
دوره 8، شماره 2
شهریور 1400
صفحه 1612-1627
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