علوم و فناوری کامپوزیت

علوم و فناوری کامپوزیت

بررسی تجربی و عددی تاثیر ورق آلومینیوم 2024 و کامپوزیت الیاف شیشه بر روی قطعات PLA لانه زنبوری ساخته شده با پرینتر سه بعدی تحت ضربه سرعت پایین

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار، مهندسی مکانیک، دانشگاه علم و فرهنگ، تهرا ن.
2 دانشجوی کارشناسی ارشد، مهندسی مکا نیک ، دانشگاه علم و فرهنگ، تهران.
3 دانشجوی کارشناسی، مهندسی مکانیک ، دانشگاه علم و فرهنگ، تهران.
10.22068/jstc.2026.2087318.1954
چکیده
در این پژوهش، رفتار دینامیکی سازه‌های ساندویچی با هسته لانه زنبوریِ پلی‌لاکتیک اسید PLA ساخته‌شده به روش پرینت سه‌بعدی و پوسته‌های تقویت‌کننده ناهمگن، تحت بارگذاری ضربه سرعت پایین ارزیابی شد. نوآوری اصلی تحقیق، تحلیل تقابل ساختاری و مقایسه عملکرد دینامیکی هسته پلیمری با دو رویه متمایز شامل ورق آلومینیوم 2024 با رفتار الاستوپلاستیک و کامپوزیت الیاف شیشه اپوکسی دوجهته با رفتار الاستیک-ترد در سطوح انرژی ۱۰، ۲۱ و ۳۰ ژول است. جهت ارزیابی کارایی مستقل از وزن سازه‌ها، شاخص انرژی جذب‌شده ویژه معرفی گردید و نمودارهای پاسخ دینامیکی و مکانیزم‌های شکست نمونه‌هاPLA ،PLA/AL و PLA/Glass مقایسه شدند. علاوه بر فرآیند تجربی، یک مدل اجزاء محدود سه‌بعدی با اعمال معیارهای آسیب پیشرونده توسعه یافت. مدل عددی توانست منحنی‌های نیرو-جابجایی و ظرفیت جذب انرژی را با خطای کمتر از ۱۰٪ نسبت به مستندات آزمایشگاهی پیش‌بینی و اعتبارسنجی کند. در نهایت، یک مطالعه پارامتریک جهت ارزیابی اثر ضخامت پوسته‌های تقویت‌کننده بر ظرفیت جذب انرژی سازه صورت پذیرفت. همچنین، تحلیل روند به کمک رگرسیون ریاضی نشان داد که نرخ جذب انرژی در نمونه‌های با رویه آلومینیومی الگویی غیرخطی و اشباع‌شونده دارد، در حالی که نمونه‌های تقویت‌شده با الیاف شیشه، رفتاری کاملاً خطی و پایدار در بازه انرژی‌های آزمایش‌شده ارائه می‌دهند.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Experimental and Numerical Investigation of the Effect of 2024 Aluminum Sheet and Glass Fiber Composite on the Low-Velocity Impact Behavior of 3D-Printed PLA Honeycomb Structures

نویسندگان English

Seyed Morteza Razavi 1
Ali Khoshnoudrad 2
Ahmad Samadi 3
1 Department of Mechanical Engineering, University of Science and Culture, Tehran, Iran.
2 Department of Mechanical Engineering, University of Science and Culture, Tehran, Iran.
3 Department of Mechanical Engineering, University of Science and Culture, Tehran, Iran.
چکیده English

In this research, the dynamic behavior of sandwich structures with 3D-printed polylactic acid (PLA) honeycomb cores and heterogeneous reinforcing skins was evaluated under low-velocity impact loading. The primary novelty of this study lies in the structural interaction analysis and dynamic performance comparison of the polymeric core with two distinct skins: 2024 aluminum alloy (elasto-plastic behavior) and bidirectional glass fiber/epoxy composite (elastic-brittle behavior) at energy levels of 10, 21, and 30 Joules. To assess weight-independent efficiency, the Specific Energy Absorption (SEA) index was introduced, and the dynamic response curves and failure mechanisms of the PLA, PLA/AL, and PLA/Glass specimens were compared. In addition to the experimental process, a 3D finite element model (3D-FEA) was developed using advanced progressive damage criteria. The numerical model successfully predicted and validated the force-displacement curves and energy absorption capacity with an error of less than 10% compared to experimental data. Finally, a parametric study was conducted to evaluate the effect of reinforcement skin thickness on the energy absorption capacity. Furthermore, mathematical trend analysis using regression revealed that the energy absorption rate in specimens with aluminum face sheets follows a non-linear, saturating pattern, whereas the glass-fiber reinforced structures exhibit a strictly linear and stable efficiency within the tested energy range.

کلیدواژه‌ها English

PLA specimen
Low‑velocity impact
Energy absorption
Hand lay‑up
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