نشریه مهندسی مکانیک امیرکبیر

نشریه مهندسی مکانیک امیرکبیر

طراحی جاذب انرژی مکعبی با هندسه مدرج تابعی برای عملکرد تدریجی-کارکردی

نوع مقاله : مقاله پژوهشی

نویسندگان
گروه مهندسی مکانیک، دانشکده مهندسی، دانشگاه بیرجند، بیرجند، ایران
چکیده
با توجه به رشد روزافزون وسایل نقلیه، توسعه سامانه‌های کارآمد جذب انرژی برای افزایش ایمنی سرنشینان درتصادفات یک ضرورت است. جاذب‌های انرژی با اتلاف انرژی جنبشی از طریق تغییر شکل پلاستیک، نقش حیاتی در کاهش آسیب‌های سازه‌ای ایفا می‌کنند. عملکرد این جاذب‌ها به شدت تحت تاثیر پارامترهای هندسی و جنس جاذب است. در این پژوهش، تاثیر طراحی هندسی هدفمند بر عملکرد یک جاذب مکعبی متخلخل از جنس آلیاژ آلومینیوم با هندسه مدرج تابعی بررسی شده است. معیارهای اصلی ارزیابی، انرژی جذب‌شده کلی و ویژه بوده‌اند. ابتدا اعتبار مدل اجزای محدود با مقایسه نتایج شبیه‌سازی و آزمایش تجربی تایید گردید. سپس با به‌کارگیری روش طراحی آزمایش، رفتار تعداد زیادی از طرح‌های هندسی با الگوهای تخلخل متفاوت به صورت عددی تحلیل شد. نتایج نشان می‌دهند که ایجاد تخلخل امکان تنظیم و کنترل رفتار فروریزش را فراهم می‌کند، به گونه‌ای‌که هم چگونگی توزیع تخلخل و هم کمیت آن، تاثیر معناداری مقدار انرژی جذب شده کلی و ویژه و هم‌چنین نیروی فروریزش اولیه جاذب دارد. به عنوان نمونه در حالت قطر اولیه 3 میلیمتر و ضریب تغییر 2/1، تخلخل می‌تواند باعث کاهش حدود 17، 26 و 25 درصدی جرم و جذب انرژی جاذب و نیروی فروریزش اولیه شود. بر این اساس، این یافته‌ها مسیری برای بهینه‌سازی هندسی جاذب‌های متخلخل به صورت مدرج تابعی جهت دستیابی همزمان به ظرفیت جذب انرژی بالا و نیروی فروریزش اولیه کمتر ارائه می‌دهد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Design of Cubic Energy Absorber with Functionally Graded Geometry for Progressive-Functional Performance

نویسندگان English

Ali Hasanabadi
Mohsen Dadgaraziz
Mojtaba Sheikhi Azqandi
Department of Mechanical Engineering, University of Birjand, Birjand, Iran
چکیده English

Nowadays, with the increasing number of vehicles and their high speeds, it is very important to protect passengers and goods inside them by designing of energy absorbers with high reliability during accidents. Energy absorbers prevent major damage to the vehicle body by absorbing the kinetic energy to plastic deformation and crushing. Material and geometric shape are most important effective in the performance of energy absorbers. In this study, the effect of smart functionally geometric designs of the porous cubic absorber have been investigated. The main criteria are the total and specific energy absorbed. At first, by comparing the results of the simulated model using the finite element method with experimental tests, the results are validated. Then, by applying design of experiments method, the analysis of different geometric shapes on its behavior was performed. The results obtained show that the amount and shape of porosity have a significant effect on the overall performance of the total and specific energy, and initial collapse force. For example, in case with initial diameter 3 mm and change parameter 1.2, functionally geometric can be reduced 17, 26 and 25 percent mass, total energy and initial collapse force respectively. Therefore, the amount and functionally shape of porosity have a significant effect on the overall performance of the adsorbent for low initial collapse force and high capacity of absorbent energy stimulatingly.

کلیدواژه‌ها English

Energy Absorber
Finite Element Method
Functionally Graded Geometry
Full Factorial Method
Smart Geometry
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