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
در این پژوهش، رفتار مکانیکی ساختارهای مشبک زیست ‌الهام‌ گرفته تحت بارگذاری فشاری شبه‌استاتیک بررسی شدند. هندسه‌های مورد مطالعه شامل ساختار لانه‌زنبوری، ساختار الهام‌گرفته از گل آفتابگردان و یک ساختار هیبریدی حاصل از تلفیق آرایش مارپیچی گل آفتابگردان با هندسه ری‌اینترنت بود. باوجود پژوهش‌های پیشین در زمینه ساختارهای آگزتیک، زیست‌الهام و پرشده با فوم، تأثیر همزمان آرایش شعاعی گل‌آفتابگردان، هندسه ری‌اینترانت و فوم بر جذب انرژی بررسی نشده است. برای پر کردن این خلأ، نوآوری این پژوهش طراحی و آزمایش تجربی یک ساختار آگزتیک زیست‌الهام پرشده با فوم پلی‌اورتان است که در آن گرادیان شعاعی سلول‌ها، هندسه با ضریب پواسون منفی و تقویت فومی برای بهبود جذب انرژی تلفیق شده است. نمونه‌ها با استفاده از پرینتر سه‌ بعدی و ماده پلی‌لاکتیک اسید ساخته شدند و در دو حالت تو خالی و پرشده با فوم مورد آزمایش قرار گرفتند. نتایج نشان داد هندسه سلولی نقش مهمی در مکانیزم کمانش، پایداری تغییر شکل و ظرفیت جذب انرژی دارد؛ به ‌طوری‌که ساختار ترکیبی گل آفتابگردان-ری‌اینترنت به دلیل رفتار آگزتیک و آرایش شعاعی-مارپیچی، توزیع تنش یکنواخت‌تر و کمانش تدریجی‌تری نسبت به لانه‌زنبوری متداول ایجاد کرد. همچنین افزودن فوم پلی‌ اورتان موجب افزایش سفتی اولیه، تأخیر در شروع کمانش و بهبود فروریزش تدریجی شد. نتایج تجربی نشان داد ساختار پیشنهادی نسبت به لانه‌زنبوری سنتی، افزایش 112 درصدی جذب انرژی، 6 درصدی جذب انرژی ویژه و 3 درصدی بازده نیروی لهیدگی را فراهم می‌کند. این ساختار می‌تواند گزینه‌ای مناسب برای جاذب‌های انرژی در صنایع هوافضا، خودرو و پنل‌های ساندویچی باشد.

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

In this study, the mechanical behavior of bio-inspired lattice structures under quasi-static compressive loading was experimentally investigated. The geometries examined included a conventional honeycomb structure, a sunflower-inspired structure, and a hybrid structure obtained by combining the spiral arrangement of sunflower patterns with re-entrant geometry. Despite many studies on auxetic, nature-inspired, and foam-filled structures, the combined effects of sunflower-inspired radial arrangement, re-entrant geometry, and foam filling on energy absorption remain unexplored. Addressing this gap, this work designs and experimentally evaluates a foam-filled bio-inspired auxetic structure using radial gradation, negative Poisson’s ratio geometry, and polyurethane foam to enhance absorption.The specimens were fabricated using three-dimensional (3D) printing technology with polylactic acid (PLA) material and were tested in both hollow and foam-filled configurations. The results demonstrated that the cellular geometry plays a significant role in 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, the addition of polyurethane foam increased the initial stiffness, delayed the onset of buckling, and improved the progressive crushing behavior. Experimental results revealed that 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. These findings suggest that the proposed structure has considerable potential for use as an energy absorber in aerospace, automotive, and sandwich panel applications.

کلیدواژه‌ها English

Honeycomb structure
energy absorber
3D printer
sunflower
re-entrant structure
Quasi-Static Loading
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  • تاریخ دریافت 27 فروردین 1405
  • تاریخ بازنگری 26 خرداد 1405
  • تاریخ پذیرش 28 خرداد 1405