نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، دانشکده مهندسی مواد، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

2 دانشیار، دانشکده مهندسی مواد، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

چکیده

سازه‌های مشبک کامپوزیتی به‌علت دارابودن خواص منحصر به‌فرد همانند استحکام و مدول ویژه بالا، ظرفیت تحمل بار بسیار بالا و همچنین میزان جذب انرژی فوق‌العاده، کاربردهای گسترده‌ای در صنایع صنایع هوا و فضا و همچنین خودروسازی پیدا کرده‌اند. این سازه‌ها در حین سرویس شرایط مختلف بارگذاری را تجربه می‌کنند. در تحقیق حاضر، پنل‌های مشبک کامپوزیتی با هندسه ایزوگرید و تقویت‌شده با نانوذرات سیلیکا تحت بارگذاری عرضی مطالعه شده‌اند. در گام اول، سطح نانوذرات سیلیکا به‌وسیله عامل کوپلینگ تری گلیسید اکسی پروپیل تری متوکسی سیلان (3-GPTS) اصلاح شد و در ادامه تاثیر افزودن درصدهای مختلف نانوسیلیکا در زمینه (صفر، 1، 3 و 5 درصد وزنی) بر رفتار خمش سه‌نقطه‌ای پنل‌های مشبک کامپوزیتی اپوکسی- الیاف شیشه نوع E مورد بررسی قرار گرفت. اصلاح سطحی نانوذرات سیلیکا و برهمکنش آن‌ها با عامل کوپلینگ 3-GPTS توسط طیف‌سنجی مادون قرمز تبدیل فوریه (FT-IR) مورد تأیید قرار گرفت. نتایج این تحقیق نشان داد که افزودن نانوذرات سیلیکای اصلاح سطحی‌شده رفتار خمش سه‌نقطه‌ای پنل‌های مشبک کامپوزیتی الیافی را تحت تأثیر قرار می‌دهد. بیشترین میزان بهبود در مقادیر بار حداکثر خمشی و جذب انرژی ویژه پنل‌ مشبک کامپوزیتی با افزودن 3 درصد وزنی نانوسیلیکای اصلاح سطحی شده به‌ترتیب با 14 درصد و 25 درصد افزایش مشاهده شد. همچنین در این کامپوزیت‌ها کسر قابل توجهی از جذب انرژی سازه بعد از نقطه حداکثر بار حاصل شد. علاوه بر این، سفتی سازه با افزودن نانوذرات سیلیکا افزایش یافت. در مجموع، تحقیق حاضر موید آن است که افزودن نانوذرات سیلیکای اصلاح سطحی‌شده به‌عنوان جزء سوم در سازه‌های مشبک کامپوزیتی می‌تواند به بهبود خواص مکانیکی آن‌ها تحت بارگذاری عرضی کمک شایانی کند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

An experimental investigation into the effect of surface-modified silica nanoparticles on the mechanical behavior of E-glass/epoxy grid composite panels under transverse loading

نویسندگان [English]

  • Hamed Khosravi 1
  • Reza Eslami-Farsani 2

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

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

چکیده [English]

Grid-stiffened composite (GSC) structures have been maturely developed in aerospace, aircraft and automobile industries due to their attractive properties such as high specific strength and stiffness, superior load bearing capacity, and excellent energy absorption capability. These structures undergo various loading conditions in service. In the present study, iso-GSC structures reinforced with silica nanoparticles (SiO2) have been investigated in terms of their capability to improve the mechanical properties during transverse loading. At first, a silane coupling agent (3-glycidoxypropyltrimethoxysilane/3-GPTS) was introduced onto the silica nanoparticle surface and the effects of silica content (0, 1, 3, and 5 wt.% with respect to the matrix material) on the three-point flexural response of isogrid E-glass/epoxy composites were assessed. Based on the Fourier transform infrared (FT-IR) spectra, it was inferred that the 3-GPTS coupling agent was successfully grafted onto the surface of silica nanoparticles after modification. The results showed that nano-SiO2 particles incorporation affected the flexural properties of the isogrid fibrous composites. Maximum improvements in the flexural load and energy absorption were obtained after adding 3 wt.% nano-SiO2 particles. In this condition, up to 14% and 25% increase in the maximum flexural load and energy absorption, respectively were observed, compared to the sample without silica addition. In these structures, a considerable amount of energy absorption occurred beyond primary failure at the peak load point. Furthermore, the flexural stiffness was increased by increasing the silica loading. In conclusion, this study suggests that the addition of modified silica nanoparticles is a promising method to improve the flexural properties of the grid-stiffened fibrous composite structures.      

کلیدواژه‌ها [English]

  • Isogrid composite
  • Surface modified silica
  • nanoparticles
  • Transverse loading
  • energy absorption

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