خواص خمشی کامپوزیت‏های زمینه‏ی اپوکسی تقویت شده با الیاف آسیاب شده

نویسندگان

1 فارغ‏التحصیل دکتری تخصصی مهندسی مواد- بخش مهندسی مواد- دانشگاه شیراز

2 استاد و عضو هیئت علمی بخش مهندسی مواد- دانشگاه شیراز

چکیده

      این پژوهش، به مطالعه خواص خمشی کامپوزیت‏های زمینه‏ی اپوکسی تقویت شده با الیاف‏های آسیاب شده از دو نوع شیشه‏ی معمولی (E-glass) و شیشه‏ی با استحکام بالا (S-glass) و یک نوع کربنِ با استحکام بالا پرداخته است. نخست، الیافِ اولیه با استفاده از آسیاب ساینده به پودر تبدیل شد و مورفولوژی آن‏ها به کمک میکروسکوپ الکترونی روبشی (SEM) مورد بررسی قرار گرفت. کامپوزیت‏های تولیدی، با مخلوط و اضافه کردن wt.%1 پودرِ حاصل از آسیاب‏کاری الیاف‏های یاد شده یک رزین اپوکسی تجاری از نوع پخت در دمای بالا تبدیل شدند. تأثیر انجام عملیات گاز زدایی رزین و هم‌چنین افزودن گاما آمینو پروپیل تری اکسی سیلین (γ-APS) به عنوان عامل اتصال دهنده‏ی رزین به فاز تقویت کننده نیز بررسی شد. برای این منظور، خواص خمشی کامپوزیت‏های تولیدی با یکدیگر مقایسه و سطح شکست نمونه‏های آزمون خمش و مکانیزم‏های چقرمگی فعال با استفاده از تصاویر SEM ارزیابی شد. با افزودن wt.%2 از γ-APS به رزین اپوکسی حاوی الیاف آسیاب شده‏ی شیشه E و سپس گاز زدایی آن، بیش‌ترین افزایش در استحکام خمشی و مدول کشسان مُماسی حاصل شد. این مقادیر به ترتیب به میزان 22/1 و 20/1 برابر نسبت به حالت خالص به دست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

Flexural Properties of Epoxy Matrix Composites Reinforced by Milled Fibers

نویسندگان [English]

  • S. Karimi 1
  • S. Javadpour 2
چکیده [English]

       Flexural properties of milled E-glass, S-glass, and high strength carbon fiber reinforced epoxy composites have been studied. As received fibers were chopped and milled by an attrition mill, and their morphologies were evaluated by Scanning Electron Microscope (SEM). The epoxy composites were prepared simply by mixing and stirring 1wt.% of the milled fibers with a conventional hot-cure epoxy resin. The effects of resin system degassing and employing a coupling agent (γ-aminopropyltriethoxysilane or γ-APS) were evaluated based on the flexural properties of the epoxy composites. The SEM micrographs of the fracture surfaces were used to investigate the active toughening mechanisms. The most appropriate flexural properties were obtained for the degassed and modified milled E-glass fiber reinforced epoxy. Its bending strength and tangent modulus of elasticity were enhanced up to 1.22 and 1.20 times in comparison to the pristine one. The current study shows that the composite not only is cost effective, but also offers higher flexural strength and tangent modulus of elasticity

کلیدواژه‌ها [English]

  • Carbon fiber
  • Glass fiber
  • Milling
  • Epoxy matrix composite
  • Bending test
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