نوع مقاله : مقاله پژوهشی

نویسندگان

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

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

10.22068/jstc.2018.89462.1456

چکیده

نیاز روز افزون به تولید محصولات سازگار با محیط زیست، محققان را بر آن داشته تا امکان استفاده از الیاف طبیعی در ساخت کامپوزیت‌ها را مورد بررسی قرار دهند. در ‏پژوهش حاضر، از الیاف گیاهی پنبه و کنف، و الیاف حیوانی پشم بافته شده ساده به عنوان تقویت کننده در کامپوزیت‌های لایه‌ای پایه اپوکسی، استفاده شد. بعلاوه، بمنظور ‏ارزیابی خواص مکانیکی کامپوزیت‌های تقویت شده با الیاف طبیعی، نمونه‌های کامپوزیتی شیشه بافته شده ساده/اپوکسی نیز ساخته شدند. خواص مکانیکی نمونه‌ها تحت ‏بارگذاری‌های کششی، برشی و خمشی تعیین شد. نتایج نشان دادند که نسبت استحکام ویژه تحت بار کششی چندلایه‌ای‌های پنبه/اپوکسی به چندلایه‌ای تقویت شده با ‏الیاف کنف یا پشم بترتیب برابر ‏‎ 1.71‎و ‏‎4.47‎‏ است. تحت بار برشی، استحکام ویژه نمونه‌ها بترتیب با تغییر الیاف کنف و پشم به پنبه نیز ‏‎1.24‎‏ و ‏‎2.45‎‏ برابر بزرگتر گردید. ‏بعلاوه، استحکام خمشی ویژه کامپوزیت‌های پنبه/اپوکسی بترتیب ‏‎1.42‎‏ و ‏‎2.34‎‏ برابر بزرگتر از کامپوزیت‌های کنف/اپوکسی و پشم/اپوکسی بدست آمد. همچنین، انرژی ‏جذب شده ویژه مربوط به کامپوزیت‌های لایه‌ای پنبه/اپوکسی تحت بار کششی ‏‎2.7‎‏ برابر بزرگتر از مقدار مربوط به کامپوزیت‌های لایه‌ای تقویت شده با الیاف شیشه است. ‏در انتها نیز به منظور بررسی میزان آب جذب شده توسط نمونه‌های مختلف، آزمون جذب رطوبت در فواصل زمانی ‏‎3‎‏ و ‏‎10‎‏ روز صورت گرفت. آشکار گردید که بیشترین ‏درصد جذب آب ‏‎(7.47%)‎‏ مربوط به نمونه تقویت شده با پنبه در بازه زمانی ‏‎10‎‏ روز بوده است.‏

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Mechanical properties of laminated composites reinforced by natural fibers of ‎cotton, wool and kenaf under tensile, flexural and shear loadings

نویسندگان [English]

  • Elham Moradi 1
  • Afshin Zeinedini 2
  • Ehsan Heidari-shahmaleki 1

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]

The increasing need for manufacturing of eco-friendly products has led researchers to explore the possibility of using of natural fibers in ‎the fabricating of composites. In the current study, plain-woven plant fibers of cotton and kenaf, and animal fiber of wool with were used ‎as the reinforcement of epoxy-based laminated composites. Moreover, in order to evaluate the mechanical properties of the natural fibers ‎reinforced laminated composites, plain-woven E-glass/epoxy composites were also manufactured. The mechanical properties of the ‎samples subjected to tensile, shear and flexural loadings were determined. The results showed that the fraction of the specific tensile ‎strength of the cotton/epoxy laminates to laminates reinforced by kenaf or wool fiber is equal to 1.71 and 4.47, respectively. Under shear ‎loading, the specific strength of the samples was also 1.24 and 2.45 times greater by changing the kenaf and wool fibers to cotton fiber, ‎respectively. In addition, the specific flexural strength of the cotton/epoxy composites was respectively obtained 1.42 and 2.34 times ‎greater than that of the kenaf/epoxy and wool/epoxy composites. Moreover, the specific energy absorption related to the cotton/epoxy ‎laminated composites under tensile loading is 2.7 times greater than that of the glass fiber reinforced laminated composites. At the end, in ‎order to measure the amount of water absorbed by different samples, moisture absorption test was also carried out at intervals of 3 and ‎‎10 days. It was revealed that the greatest percent of the water absorption (7.47%) is related to the cotton reinforced specimen at interval of ‎‎10 days‎.

کلیدواژه‌ها [English]

  • Natural fibers
  • epoxy
  • Mechanical properties
  • laminated composites ‎
 
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