مهندسی ساخت و تولید ایران

مهندسی ساخت و تولید ایران

بررسی آزمایشگاهی رفتار خمشی سازه ساندویچی با لایه میانی آگزتیک ساخته شده از مواد سازگار با محیط زیست

نوع مقاله : مقاله پژوهشی

نویسندگان
گروه مهندسی مکانیک، دانشگاه خوارزمی، تهران، ایران
چکیده
استفاده از مواد زیست‌تخریب‌پذیر در طراحی و ساخت سازه‌های مهندسی، به‌عنوان راهکاری مؤثر برای کاهش آلودگی‌های زیست‌محیطی و بهبود پایداری مکانیکی، مورد توجه بسیاری از پژوهشگران قرار گرفته است. در این تحقیق، به بررسی رفتار خمشی ساندویچ پنل‌هایی پرداخته شده است که هسته آن‌ها دارای ساختار آگزتیک بوده و از پلی‌لاکتیک‌اسید (PLA) ساخته شده است. این هسته‌ها با استفاده از فناوری چاپ سه‌بعدی تولید شده‌اند تا کنترل دقیق‌تری بر هندسه و ابعاد سلولی آن‌ها باشد. همچنین، برای بهینه‌سازی نسبت استحکام به وزن و کاهش اثرات مخرب زیست‌محیطی، از ورق‌های چوب بالسا به‌عنوان رویه استفاده شده است. به‌منظور بررسی جامع‌تر، آزمون‌های خمش چهار‌نقطه‌ای و کشش روی نمونه‌ها انجام شد تا تأثیر پارامترهای هندسی، از جمله شکل و ابعاد سلولی هسته‌های آگزتیک، بر استحکام، میزان جذب انرژی و پایداری سازه ارزیابی گردد. نتایج حاصل از این آزمایش‌ها نشان داد که هسته‌های آگزتیک، در مقایسه با ساختارهای غیرآگزتیک مانند لانه‌زنبوری و سرنیزه‌ای، عملکرد بهتری از نظر استحکام و جذب انرژی ارائه می‌دهند. علاوه بر این، مشخص شد که افزایش ابعاد سلولی هسته، بدون افزایش وزن، موجب بهبود استحکام و افزایش میزان جذب انرژی سازه می‌شود. یافته‌های این پژوهش نشان می‌دهد که انتخاب هندسه و ساختار مناسب در طراحی سازه‌های آگزتیک با استفاده از مواد زیست‌تخریب‌پذیر می‌تواند به بهبود عملکرد مکانیکی منجر شود. این نتایج، ضمن تأکید بر امکان استفاده از مواد زیست‌تخریب‌پذیر در سازه‌های مهندسی، می‌تواند مبنایی برای تحقیقات آینده در زمینه توسعه سازه‌های سبک، پایدار و کارآمد باشد.
کلیدواژه‌ها

عنوان مقاله English

Experimental investigation of bending behavior of sandwich structures with auxetic core made of biodegradable materials

نویسندگان English

Seyed Ali Hosseini
Hassan Shokrollahi
Seyed Ali Mousavi
Hadi Sabouri
Department of Mechanical Engineering, Kharazmi University, Tehran, Iran
چکیده English

The use of biodegradable materials in the design and construction of engineering structures has attracted significant attention as an effective approach to reducing environmental pollution and enhancing mechanical sustainability. This study investigates the flexural behavior of sandwich panels with auxetic cores made of polylactic acid (PLA). These cores were fabricated using 3D printing technology to achieve precise control over their geometry and cellular dimensions. Additionally, balsa wood sheets were used as face sheets to optimize the strength-to-weight ratio and minimize environmental impact. To conduct a comprehensive evaluation, four-point bending and tensile tests were performed on the specimens to assess the effect of geometric parameters, including the shape and size of the auxetic core cells, on strength, energy absorption, and structural stability. The experimental results indicated that auxetic cores including re-entrant designs exhibit superior performance in terms of strength and energy absorption compared to non-auxetic structures such as honeycomb designs. Furthermore, it was found that increasing the core cell dimensions without adding extra weight enhances both strength and energy absorption capacity. The findings of this study suggest that incorporating biodegradable materials in the design of auxetic structures not only reduces environmental impact but also improves their mechanical performance. These results provide a foundation for future research in the development of lightweight and efficient structural designs.

کلیدواژه‌ها English

Sandwich Panel
Auxetic Structure
Biodegradable Materials
Four-point Bending Test
3D Print
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