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بررسی عملکرد جاذب‌های انرژی چند سلولی باضخامت متغیر تحت بار ضربه‌ای | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| دوره 56، شماره 10، 1403، صفحه 1451-1472 اصل مقاله (2.01 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2025.23763.7810 | ||
| نویسندگان | ||
| سعید فعلی* 1؛ محمدحسین کیانی1؛ سید سجاد جعفری2 | ||
| 1گروه مهندسی مکانیک، دانشگاه رازی، کرمانشاه، ایران. | ||
| 2گروه مهندسی مکانیک، دانشگاه صنعتی همدان، همدان، ایران | ||
| چکیده | ||
| در سال‌های اخیر، سازه‌های چند سلولی به‌عنوان جاذب انرژی در مهندسی خودرو، برای کاهش آسیب به سرنشینان در تصادفات، موردتوجه قرارگرفته‌اند. در این مقاله، جذب انرژی سازه‌های جدار نازک مربعی باضخامت متغیر (هدفمند) تحت بار ضربه‌ای دینامیکی محوری به روش‌های تحلیلی و عددی بررسی‌شده‌اند. چهار نوع پروفیل مربعی شکل، شامل پروفیل‌های تک، دو، چهار و پنج سلولی باضخامت ثابت و متغیر موردبررسی قرارگرفته‌اند. شبیه‌سازی‌ها در نرم‌افزار اجزا محدود آباکوس انجام شد تا نمودارهای نیرو برحسب جابجایی و انرژی برحسب زمان به دست آید. در روش تحلیلی، معادلات انرژی جذب‌شده و نیروی فروریزش محوری بر اساس تئوری چین‌خوردگی استخراج شدند و به پروفیل‌های باضخامت متغیر تعمیم داده شدند. نتایج نشان دادند که پروفیل‌های پنج سلولی به‌طور قابل‌توجهی بهتر از پروفیل‌های تک‌سلولی عمل می‌کنند. در شبیه‌سازی‌های عددی و حل تحلیلی، پروفیل‌های پنج سلولی به ترتیب 66 و 56 درصد انرژی بیشتری نسبت به پروفیل‌های تک‌سلولی در حالت‌های ضخامت ثابت و متغیر جذب کردند. میانگین نیروی فروریزش در روش تحلیلی با نتایج عددی مقایسه شد و خطای محاسباتی کمتر از 9 درصد بود. | ||
| کلیدواژه‌ها | ||
| سازه‌های جدار نازک؛ ضخامت هدفمند؛ جذب انرژی؛ مدل تحلیلی و عددی؛ بارگذاری ضربه‌ای | ||
| عنوان مقاله [English] | ||
| Investigation of the performance of multi-cellular energy absorbers with functionally graded thickness under impact loading | ||
| نویسندگان [English] | ||
| Saeid Feli1؛ mohamad hossein kiani1؛ seyed sajad jafari2 | ||
| 1فنی مهندسی، دانشگاه رازی، کرمانشاه، ایران | ||
| 2Assistant Professor, Department of Mechanical Engineering, Hamedan University of Technology, Hamedan, Iran. | ||
| چکیده [English] | ||
| In recent years, multi-cellular structures have gained significant attention as energy absorbers in automotive engineering to mitigate occupant injuries in collisions. This paper investigates the energy absorption of square shape thin-walled structures with constant thickness and functionally graded thickness under dynamic axial impact loading using both analytical and numerical methods. Four types of square profiles, including single-cell, two-cell, four-cell, and five-cell profiles, were studied. Simulations were conducted using the Finite Element Analysis Abaqus software to obtain force-displacement and energy-time curves. In the analytical method, equations for absorbed energy and axial collapse force were derived based on the folding theory and extended to profiles with functionally graded thickness. There is good agreement between analytical and numerical methods. Results of the analytical and numerical methods showed that five-cell profiles performed significantly better than single-cell profiles. In numerical simulations and analytical solutions, five-cell profiles absorbed 66% and 56% more energy, respectively, compared to single-cell profiles in both constant and functionally graded thickness conditions. The average collapse force in the analytical method was compared with numerical results, and the computational error was less than 9%. | ||
| کلیدواژه‌ها [English] | ||
| Thin-Wall Structure, Functionally Graded Thickness, Energy Absorption, Analytical and Numerical Methods, Impact Loading | ||
| مراجع | ||
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