بررسی تجربی اثر افزودن نانولوله‌های کربنی درون مادّه‌ی زمینه، بر رفتار کمانشی ورق‌های کامپوزیتی الیاف شیشه/ اپوکسی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه آموزشی هوافضا، دانشکده مکانیک، دانشگاه صنعتی شاهرود

2 گروه جامدات، دانشکده مهندسی مکانیک، دانشگاه صنعتی شاهرود، شاهرود، ایران

3 صنعتی شاهرود-مهندسی مکانیک

چکیده

در این پژوهش، اثر افزودن نانولوله‌های کربنی به‌عنوان تقویت‌کننده به مادّه‌ی زمینه‌ی پلیمری و دارای الیاف شیشه بر بار بحرانی کمانش ورق‌های کامپوزیتی تحت بارگذاری فشاری، به روش تجربی بررسی شده است. ورق‌های کامپوزیتی، مستطیل شکل از جنس الیاف شیشه/ اپوکسی و تقویت‌شده با 25/0، 5/0، و 0/1 درصد وزنی نانولوله‌ی کربنی به روش لایه‌گذاری دستی ساخته شده‌اند. این ورق‌ها در شرایط دوسر گیردار به یک دستگاه یونیورسال هیدرولیک اینسترون بسته شد و بار به‌صورت فشاری درون‌صفحه‌ای و تک‌محوری در راستای طولی به آنها اعمال شد. نتایج نشان داد که افزودن 5/0درصد وزنی نانولوله‌ی کربنی به رزین اپوکسی، بیشترین تأثیر را بر بار بحرانی کمانش این ورق‌ها دارد، به‌گونه‌ای که ورق‌های حاوی این مقدار نانولوله‌ی کربنی، بیشتر از دو برابر بار فشاری را نسبت به ورق مشابه بدون نانولوله‌ی کربنی تا رسیدن به آستانه‌ی کمانش، می‌توانند تحمّل کنند. با افزایش درصد وزنی نانولوله به یک درصد، به دلیل کلوخه‌ای‌شدن نانولوله‌ی ‌کربنی درون رزین اپوکسی و کاهش کیفیت پراکندگی نانولوله‌ها، بیشینه نیروی قابل تحمّل سازه، کاهش می‌یابد. برای راستی‌آزمایی نتایج آزمایش، تحلیل کمانش ورق‌های کامپوزیتی الیاف شیشه/ اپوکسی در نرم‌افزار اجزای محدود آباکوس انجام شد و بار بحرانی کمانش حاصل از نرم‌افزار با نتایج تجربی مقایسه شد و تطابق خوبی به‌دست آمد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of adding carbon nanotubes into the matrix material on the buckling behavior of glass/epoxy composite plates: An experimental study

نویسندگان [English]

  • Hamid Reza Sabermanesh 1
  • Mehdi Ghannad 2
  • Seyed Mahdi Hossein Farrash 3
1 Shahrood Univercity of Technalogy
2 Departement of Solid Mechanics, Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
3 صنعتی شاهرود-مهندسی مکانیک
چکیده [English]

In this research, buckling of polymer matrix composite plates containing unidirectional glass fibers under in-plane pressure load is investigated. Moreover, the effect of adding carbon nanotubes as reinforcement into the matrix material on the critical buckling load of composite plates is studied. Using hand lay-up method, rectangular glass/epoxy composite plates with and without carbon nanotubes were fabricated. 0.25, 0.5 and 1.0 weight percent of carbon nanotubes were added to the epoxy resin and composite plates were subjected to the longitudinal in-plane pressure load. The plates were tested under fix ended boundary conditions utilizing Instron hydraulic universal testing machine. Based on the results, adding 0.5 weight percent of carbon nanotubes has the most influence on the critical buckling load of the plates. Results show that adding 0.5 weight percent of carbon nanotubes into the matrix material increases the critical buckling load of the carbon nanotubes /glass/epoxy plate more than two times with respect to that of glass/epoxy composite plate. Furthermore, when the carbon nanotubes weight percent reaches 1 %, because of carbon nanotubes agglomeration, carbon nanotubes are not dispersed well into the epoxy resin and the critical buckling load of the composite plate decreases. To validate the results, buckling analysis of glass/epoxy composite plate was done in Abaqus finite element software. Finite element models confirm the experimental results obtained.
 

کلیدواژه‌ها [English]

  • composite plate
  • Carbon Nanotube
  • Glass/Epoxy fibers
  • Buckling analysis
  • Experimental study
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