تحلیل تجربی خواص جذب انرژی ساختار لانه‌زنبوری پرشده با فوم الهام گرفته از گل آفتابگردان ترکیب شده با ساختار ری اینترنت تحت بارگذاری شبه استاتیکی خارج از صفحه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، دانشکده مهندسی هوافضا، دانشگاه علوم و فنون هوایی شهید ستاری، تهران، ایران

2 دانشیار، دانشکده مهندسی هوافضا، دانشگاه علوم و فنون هوایی شهید ستاری، تهران، ایران

3 دانشجوی کارشناسی ارشد، مرکز تحصیلات تکمیلی، دانشگاه علوم و فنون هوایی شهید ستاری، تهران، ایران

چکیده
مقدمه: ساختارهای سلولی زیست ‌الهام‌گرفته و هندسه‌های آگزتیک به دلیل قابلیت بالای جذب انرژی و ویژگی‌های مطلوب تغییر شکل، توجه بسیاری را به خود جلب کرده‌اند. با وجود مطالعات متعدد درباره ساختارهای آگزتیک، زیست‌ الهام و پرشده با فوم، تأثیر همزمان آرایش شعاعی الهام‌گرفته از گل آفتابگردان، هندسه ری ‌اینترانت و پرشدگی فومی بر رفتار مکانیکی و عملکرد جذب انرژی این ساختارها تاکنون به‌ طور جامع بررسی نشده است.
روش: در این پژوهش، رفتار مکانیکی ساختارهای مشبک زیست ‌الهام‌گرفته تحت بارگذاری فشاری شبه ‌استاتیک به‌ صورت تجربی بررسی شدند. هندسه‌های مورد مطالعه شامل ساختار لانه‌زنبوری متداول، ساختار الهام‌گرفته از گل آفتابگردان و ساختار هیبریدی گل آفتابگردان-ری‌اینترنت بودند. نمونه‌ها با استفاده از فناوری چاپ سه‌ بعدی و از جنس پلی‌لاکتیک اسید (PLA) ساخته شدند و در دو حالت توخالی و پرشده با فوم پلی‌اورتان مورد آزمون قرار گرفتند.
یافته ­ها: نتایج نشان داد که هندسه سلولی نقش مهمی در مکانیزم کمانش، پایداری تغییر شکل و ظرفیت جذب انرژی دارد. ساختار ترکیبی گل آفتابگردان-ری‌اینترنت به دلیل رفتار آگزتیک و آرایش شعاعی-مارپیچی خود، نسبت به ساختار لانه‌زنبوری متداول، توزیع تنش یکنواخت‌تر و فروریزش تدریجی‌تری را ایجاد کرد. همچنین، افزودن فوم پلی‌اورتان موجب افزایش سفتی اولیه، تأخیر در شروع کمانش و بهبود رفتار فروریزش تدریجی شد. نتایج تجربی نشان داد که ساختار پیشنهادی در مقایسه با لانه‌زنبوری متداول، افزایش ۱۱۲ درصدی جذب انرژی، بهبود ۶ درصدی جذب انرژی ویژه و افزایش ۳ درصدی بازده نیروی لهیدگی را فراهم می‌کند.
نتیجه ­گیری: تلفیق هندسه الهام‌گرفته از گل آفتابگردان، پیکربندی آگزتیک و پرشدگی با فوم پلی‌اورتان، موجب بهبود چشمگیر عملکرد جذب انرژی و پایداری تغییر شکل سازه‌های سلولی می‌شود. این ساختار می‌تواند به ‌عنوان گزینه‌ای مناسب برای کاربرد در جاذب‌های انرژی صنایع هوافضا، خودروسازی و پنل‌های ساندویچی مورد استفاده قرار گیرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Experimental Analysis of the Energy Absorption Properties of Foam-Filled Sunflower-Inspired Honeycomb Structures Combined with Re-Entrant Geometry under Out-of-Plane Quasi-Static Loading

نویسندگان English

Reza Sarkhosh 1
Mohammad Kazemi Nasrabadi 2
Mahdi Zandieh 3
1 Assistant Professor, Department of Aerospace Engineering, Shahid Sattari University of Aeronautical Sciences and Technology, Tehran, Iran
2 Associated Professor, Department of Aerospace Engineering, Shahid Sattari Aeronautical University of Science and Technology, Tehran, Iran
3 MSC Student in Aerospace, Graduate Center, Shahid Sattari University of Aeronautical Sciences and Technology, Tehran,Iran
چکیده English

Introduction: Bio-inspired cellular structures and auxetic geometries have attracted considerable attention due to their superior energy absorption capabilities and deformation characteristics. However, the combined effects of sunflower-inspired radial arrangement, re-entrant geometry, and foam filling on the mechanical response and energy absorption performance of cellular structures remain largely unexplored.
Methods: This study experimentally investigates the quasi-static compressive behavior of conventional honeycomb, sunflower-inspired, and hybrid sunflower re-entrant lattice structures in both hollow and polyurethane foam-filled configurations. The specimens were fabricated using three-dimensional (3D) printing technology with polylactic acid (PLA) material and tested under quasi-static compression.
Findings: The results demonstrated that cellular geometry significantly influences the buckling mechanism, deformation stability, and energy absorption capacity. The hybrid sunflower re-entrant structure exhibited a more uniform stress distribution and a more progressive collapse mode than the conventional honeycomb structure due to its auxetic behavior and radial–spiral arrangement. Furthermore, polyurethane foam increased the initial stiffness, delayed the onset of buckling, and improved the progressive crushing behavior. The proposed structure achieved a 112% increase in energy absorption, a 6% improvement in specific energy absorption, and a 3% enhancement in crushing force efficiency compared with the conventional honeycomb structure.
Conclusion:
The synergistic combination of sunflower-inspired geometry, re-entrant auxetic configuration, and polyurethane foam filling considerably enhances the energy absorption performance and deformation stability of cellular structures, indicating significant potential for applications in aerospace, automotive, and sandwich panel systems.

کلیدواژه‌ها English

Honeycomb structure
energy absorber
3D printer
sunflower
re-entrant structure
Quasi-Static Loading
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  • تاریخ دریافت 27 فروردین 1405
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