مکانیک ساختارهای هوشمند

مکانیک ساختارهای هوشمند

بررسی عددی رفتار مکانیکی و عملکرد جذب انرژی ساختارهای آگزتیک و کلاسیک تقویت‌شده تحت بارگذاری فشاری شبه‌استاتیک

نوع مقاله : مقاله پژوهشی

نویسندگان
1 فارغ التحصیل دانشکده مهندس رشته مکانیک گرایش طراحی کاربردی دانشگاه بو علی سینا،همدان، ایران
2 دانشجو دکتری مهندسی مکانیک گرایش طراحی کاربردی، دانشگاه بو علی سینا، همدان، ایران
10.30511/jmms.2026.2105386.1077
چکیده
ساختارهای سلولی آگزتیک تقویت‌شده به‌دلیل ضریب پواسون منفی، تغییرشکل جانبی همگرا و قابلیت مطلوب در توزیع یکنواخت تنش، از گزینه‌های کارآمد در سامانه‌های جاذب انرژی و حفاظت ضربه‌ای به‌شمار می‌روند. در این پژوهش، رفتار مکانیکی و راندمان جذب انرژی پنج پیکربندی تقویت‌شده کلاسیک شامل ساختارهای «ستاره‌ای»، «لانه‌زنبوری»، «درون‌سو»، «سرنیزه‌ای» و «هیتلری» تحت بارگذاری فشاری شبه‌استاتیک به روش اجزای محدود مورد بررسی و مقایسه قرار گرفت. نتایج نشان داد که الگوی مهاربندی داخلی و هندسه اتصالات، اثر مستقیمی بر جرم، نیروی خردشدگی بیشینه اولیه (PCF)، نیروی خردشدگی میانگین (MCF) و انرژی ویژه جذب‌شده (SEA) دارد. ساختار تقویت‌شده ستاره‌ای با جرم 5/85 گرم، بالاترین انرژی ویژه جذب‌شده معادل 47/1 کیلوژول بر کیلوگرم، نیروی بیشینه کنترل‌شده 5126/29 نیوتن و بیشینه راندمان جذب انرژی 0/48 در جابه‌جایی 18 میلی‌متر را ثبت کرد و به‌عنوان پیکربندی بهینه با بیشترین کارایی وزنی شناخته شد. در مقابل، ساختار تقویت‌شده لانه‌زنبوری با وجود ثبت راندمان لحظه‌ای اولیه 0/94، به دلیل ناپایداری لایه‌ای با افت شدید راندمان مواجه گردید و ساختار درون‌سو با جرم 17/07 گرم و بالاترین نیروی بیشینه (8252/22 نیوتن)، راندمان 0/34 را ارائه داد. تحلیل مکانیزم‌های تغییرشکل نشان داد که تشکیل متوالی لولاهای پلاستیکی در بازوهای ساختار ستاره‌ای ضمن مهار تمرکز تنش، فاز فلات پایدار (۵۰۰۰ تا ۵۵۰۰ نیوتن) و فروریزش یکنواخت را تا پیش از شروع تراکم نهایی فراهم می‌سازد.
کلیدواژه‌ها

عنوان مقاله English

Numerical Investigation into the Mechanical Behavior and Energy Absorption Performance of Reinforced Auxetic and Classical Structures under Quasi-Static Compressive Loading

نویسندگان English

Erfan Taherkhani 1
Mohamad Reza Parsaeiyan 2
Mahdi mardani 2
1 Graduate of the Faculty of Engineering, Mechanical Engineering (Applied Design), Bu‑Ali Sina University, Hamadan, Iran.
2 PhD Student in Mechanical Engineering (Applied Design), Bu Ali Sina University, Hamadan, Iran.
چکیده English

Reinforced auxetic cellular structures offer significant potential for energy absorption and crashworthiness due to their negative Poisson’s ratio and uniform stress distribution. In this study, five reinforced configurations—Star-shaped, Honeycomb, Re-entrant, Arrowhead, and Hitler-shaped—were numerically investigated under quasi-static compression. The reinforced star-shaped structure achieved the best crashworthiness performance, exhibiting the highest specific energy absorption SEA=47.1 kJ/kg with a mass of 5.85 g, a controlled peak crushing force (PCF=5126.29 N), and an efficiency of 0.480.480.48 at an 18 m displacement. In contrast, the honeycomb design suffered post-collapse instability despite an initial efficiency of 0.940.940.94, while the re-entrant configuration, having the highest mass (17.07 g) and peak force (8252.22 N), provided an efficiency of only 0.34 Progressive plastic hinge formation in the star structure mitigated stress concentration, ensuring a stable plateau regime (5000–5500 N) and uniform collapse prior to densification.

کلیدواژه‌ها English

Auxetic structures
Energy absorption
Specific energy absorption (SEA)
Energy absorption efficiency
Classical structures
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