علوم و فناوری کامپوزیت

استفاده از کامپوزیت‌های لایه‌ای پنبه/اپوکسی برای ساخت ساندویچ پنل‌ها با هسته موجی ‏کسینوسی یکطرفه و دو طرفه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، گروه مهندسی مکانیک، دانشکده فنی مهندسی، دانشگاه آزاد اسلامی، واحد کرمانشاه، کرمانشاه

2 استادیار، گروه مهندسی مکانیک، دانشکده فنی مهندسی، دانشگاه آزاد اسلامی، واحد کرمانشاه، کرمانشاه

10.22068/jstc.2020.113750.1590

چکیده

کامپوزیت‌های لایه‌ای زمینه ‏پلیمری تقویت‌شده با الیاف بلند به ‏علت خصوصیات مناسب کاربردهای ‏بسیار زیادی دارند. از طرف دیگر، ‏برخی خطرات زیست محیطی الیاف ‏مصنوعی در کامپوزیت‌ها، محققان ‏را بر آن داشته تا امکان استفاده از ‏انواع الیاف طبیعی و تجدیدپذیر در ‏ساخت کامپوزیت‌های زمینه ‏پلیمری مورد بررسی قرار گیرد. ‏ساندویچ پنل‌ها از جمله مهمترین ‏ساختارها در صنایع مختلف بشمار ‏می‌روند. در تحقیق حاضر، الیاف ‏گیاهی پنبه و رزین اپوکسی، برای ‏ساخت هسته و پوسته‌های ساندویچ ‏پنل‌ها استفاده شد. امروزه، ‏هسته‌های موجی یک طرفه به وفور ‏در ساخت سازه‌های ساندویچی ‏مورد استفاده قرار می‌گیرند. در این ‏پژوهش، هسته موجی دو طرفه ‏برای ساخت ساندویچ پنل‌های ‏کامپوزیتی تقویت شده با الیاف ‏طبیعی پیشنهاد گردید. به‌ علاوه، ‏برای ارزیابی اثر نوع راستا، انواع ‏مختلفی از هسته‌های موجی یک ‏طرفه شامل عرضی یا طولی با ‏کمان رو به بالا یا پایین در نظر ‏گرفته شدند. برای ساخت قالب ‏هسته‌های موجی، فناوری ساخت ‏افزایشی مورد استفاده قرار گرفت. ‏ساندویچ پنل‌ها تحت بارگذاری ‏خمش سه نقطه قرار گرفتند. نتایج ‏تجربی نشان دادند که ساندویچ ‏پنل‌ها با هسته موجی دو طرفه ‏تحت بارگذاری خمشی نسبت به ‏ساندویچ پنل‌ها با هسته یک طرفه ‏خواص مکانیکی قابل توجهی دارد. ‏به علاوه، نتایج بدست آمده در این ‏تحقیق با ساندویچ پنل‌های متناظر ‏که با استفاده از کامپوزیت‌های ‏شیشه/اپوکسی ساخته شده بودند، ‏مقایسه شد. مشاهده گردید که ‏خواص خمشی ساندویچ پنل‌های ‏تقویت شده با الیاف پنبه دارای ‏استحکام قابل قبولی در مقایسه با ‏ساندویچ پنل‌های تقویت شده با ‏الیاف شیشه هستند. ‏

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Application of cotton/epoxy laminated composites to fabricate the uni- and bi-‎directional cosine corrugated cores sandwich panels ‎

نویسندگان [English]

  • Ehsan Heidari-shahmaleki 1
  • Afshin Zeinedini 2

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

2 Department of Mechanical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.

چکیده [English]

Polymer matrix laminated ‎composites reinforced by long ‎fibers have many applications due ‎to their appropriate properties. On ‎the other hand, some environmental ‎dangers of artificial fibers in ‎composites have led researchers to ‎consider the possibility of using a ‎variety of natural and renewable ‎fibers in the fabrication of ‎polymeric composites. Sandwich ‎panels are one of the most ‎important structures in different ‎industries. In the present study, the ‎cotton plant fiber and epoxy resin ‎were used to manufacture the core ‎and skins of sandwich panels. ‎Nowadays, uni-directional ‎corrugated cores are widely used in ‎the construction of sandwich ‎structures. In this study, a bi-‎directional corrugated core was ‎proposed to fabricate the sandwich ‎panels made of laminated ‎composites reinforced by natural ‎fibers. Moreover, in order to ‎evaluate the effect of core ‎arrangement, different types of uni-‎directional corrugated cores ‎including longitudinal or transverse ‎with arch upward or downward ‎were considered. Additive ‎manufacturing technology was used ‎to make the core molds. The ‎sandwich panels were subjected to ‎three-point bending loading. ‎Experimental results showed that ‎the sandwich panels with bi-‎directional corrugated core under ‎flexural loading had significant ‎mechanical properties compared to ‎the sandwich panels with uni-‎directional corrugated core. In ‎addition, the results obtained from ‎this study were compared with the ‎corresponding sandwich panels ‎made using glass/epoxy laminated ‎composites. It was found that the ‎flexural properties of the ‎cotton/epoxy sandwich panels were ‎acceptable in comparison with ‎glass/epoxy sandwich panels.‎

کلیدواژه‌ها [English]

  • Laminated composites
  • Natural fibers
  • ‎Sandwich panels
  • Additive Manufacturing
  • ‎Corrugated core
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علوم و فناوری کامپوزیت
دوره 7، شماره 2
شهریور 1399
صفحه 863-872
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