علوم و فناوری کامپوزیت

علوم و فناوری کامپوزیت

ارزیابی رفتار مکانیکی کامپوزیت هیبریدی اپوکسی/الیاف شیشه-الیاف الکتروریسی شده پلی یورتان تحت بارگذاری های کششی و خمشی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، گروه مهندسی و علم مواد، دانشکده مهندسی، دانشگاه زنجان، زنجان.
2 استادیار، گروه مهندسی و علم مواد، دانشکده مهندسی، دانشگاه زنجان، زنجان.
10.22068/jstc.2026.2094283.1965
چکیده
در این کار پژوهشی تاثیر افزودن الیاف الکتروریسی شده پلی‌یورتان بر خواص مکانیکی کامپوزیت اپوکسی/ الیاف شیشه بررسی شد. بدین منظور، کامپوزیت‌های حاوی لایه‌های مختلف الیاف پلی‌یورتان (0، 1، 2، 3 و 5) و 4 لایه الیاف شیشه به صورت هیبریدی با چیدمان‌های متقارن ساخته شدند. سپس تحت بارگذاری‌های کششی و خمشی، خواص مکانیکی آن‌ها مورد ارزیابی قرار گرفت. تحت بارگذاری کششی، کامپوزیت بدون الیاف الکتروریسی شده دارای بیشترین استحکام کششی و مدول الاستیک بود، در حالی که افزودن یک لایه الیاف الکتروریسی شده پلی‌یورتان، به ترتیب باعث کاهش 4.5 و 32.4 درصدی این خواص نسبت به کامپوزیت بدون الیاف الکتروریسی شده شد. در مقابل، افزودن یک لایه الیاف الکتروریسی شده موجب افزایش 82 درصدی انرژی جذب‌شده، از kJ/m3 103×4.61 به 103×8.39 شد. همچنین، بیشترین کرنش شکست، برابر با 0.051 mm/mm، در کامپوزیت حاوی 5 لایه الیاف الکتروریسی شده بدست آمد که نسبت به مقدار 0.026 mm/mm در کامپوزیت بدون الیاف الکتروریسی شده، 96.2 درصد افزایش نشان داد. تحت بارگذاری خمشی، بیشترین استحکام خمشی در کامپوزیت حاوی 2 لایه الیاف الکتروریسی شده، با مقدار 262 MPa، حاصل شد که در مقایسه با مقدار 150 MPa در کامپوزیت بدون الیاف الکتروریسی شده، 74.7 درصد افزایش داشت. همچنین، مدول خمشی با افزایش تعداد لایه‌های الیاف الکتروریسی شده افزایش یافت و از 11.18 GPa در کامپوزیت بدون الیاف الکتروریسی شده به 18.72 GPa در نمونه حاوی 5 لایه رسید که بیانگر افزایش 67.3 درصدی است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Assessing the mechanical behaviour of hybrid electrospun polyurethane-glass fibers/epoxy composite under the tensile and flexural loadings

نویسندگان English

Sepehr Shariati Rad 1
Hossein Ebrahimnezhad-Khaljiri 2
Aliakbar Ghadi 2
1 Department of Materials Science and Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran.
2 Department of Materials Science and Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran.
چکیده English

In this research work, the effect of adding electrospun polyurethane fibers on the mechanical properties of epoxy/glass fiber composites was investigated. For this purpose, composites containing different layers of polyurethane fibers (0, 1, 2, 3, and 5) and 4 layers of glass fibers were fabricated in a hybrid manner with symmetric layups. Then, their mechanical properties were evaluated under tensile and flexural loadings. Under tensile loading, the composite without electrospun fibers exhibited the highest tensile strength and elastic modulus, while the addition of one layer of electrospun polyurethane fibers resulted in 4.5% and 32.4% reductions in these properties, respectively, compared with the composite without electrospun fibers. In contrast, the addition of one layer of electrospun fibers resulted in an 82% increase in absorbed energy, from 4.61 × 10³ kJ/m³ to 8.39 × 10³ kJ/m³. Moreover, the highest fracture strain, equal to 0.051 mm/mm, was obtained in the composite containing 5 layers of electrospun fibers, which showed a 96.2% increase compared with the value of 0.026 mm/mm for the composite without electrospun fibers. Under flexural loading, the highest flexural strength was obtained in the composite containing 2 layers of electrospun fibers, with a value of 262 MPa, which represented a 74.7% increase compared with the value of 150 MPa for the composite without electrospun fibers. Furthermore, the flexural modulus increased with increasing number of electrospun fiber layers, from 11.19 GPa in the composite without electrospun fibers to 18.72 GPa in the specimen containing 5 layers, representing a 67.3% increase.

کلیدواژه‌ها English

Electrospun fibers
Hybrid composite
Polyurethane
Mechanical properties
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