نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، مهندسی مکانیک، دانشگاه آزاد تاکستان، تاکستان، ایران

2 استاد، مهندسی مکانیک، دانشگاه بوعلی سینا، همدان، ایران

3 دانشجوی دکتری، مهندسی مکانیک، دانشگاه بوعلی سینا، همدان، ایران

چکیده

در این تحقیق، اثر جنس و ضخامت لایه میانی بر جذب انرژی ورق‌های فلزی الیافی (FML) با مقطع مربعی تحت بار محوری شبه استاتیکی به‌صورت تجربی و عددی مورد بررسی قرار گرفته است. چهار لایه میانی شیشه-اپکسی، کربن-اپکسی، فوم پلی‌یورتان و آلومینیوم 2024 برای ساخت نمونه‌ها در نظر گرفته شد. درحالی‌که لایه‌های درونی و بیرونی تمامی نمونه‌ها، آلومینیوم 2024 انتخاب شده است. نمونه‌ها با استفاده از دستگاه پرس با جابجایی و سرعت یکسان فشرده شدند و ویژگی جذب انرژی آن‌ها شامل نیروی بیشینه، نیروی متوسط لهیدگی، انرژی جذب شده و تعداد چین‌خوردگی هر مورد مطالعه و مقایسه شد. سپس، شبیه‌سازی عددی بر روی نمونه‌ها انجام و مدل عددی به‌وسیله آزمایش‌های صورت گرفته اعتبار سنجی شد. حال، به‌وسیله مدل عددی اعتبار سنجی شده، اثر تغییر ضخامت لایه میانی برای یافتن ضخامت بهینه، مطالعه شد. نتایج پژوهش نشان داد که نمونه ساخته شده با لایه میانی الیاف کربن، بیشترین میزان جذب انرژی و نیروی متوسط را دارا می‌باشد. همچنین، نمونه با لایه میانی فوم کمترین بازدهی را از خود نشان داد. سرانجام با تغییر ضخامت لایه میانی نتیجه شد که بهترین عملکرد مربوط به نمونه‌های است که ضخامت هر سه لایه تشکیل‌دهنده آن با هم برابر هستند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The effect of middle layer material and thickness on the quasi-static energy absorption of FML

نویسندگان [English]

  • Elham Ansari 1
  • Gholamhossein majzoobi 2
  • Kaveh Rahmani 3
  • Mohammad Kashfi 3

1 - Mechanical Engineering Department, Islamic University of Takestan, Takestan, Iran

2 Mechanical Engineering Department, Bu-Ali Sina University, Hamedan, Iran

3 Mechanical Engineering Department, Bu-Ali Sina University, Hamedan, Iran

چکیده [English]

In the present study the effect of change in thickness and material of the middle layer in fiber metal laminates (FMLs) with squared section on the energy absorption is investigated. In this work four types of specimens, based on the change in the material of the middle layer, were produced. In order to fabricate FML samples, Glass-epoxy, Carbon-epoxy, polyurethane foam and aluminum 2024 were utilized as the middle layer and aluminum 2024 for inner and outer layers, respectively. The specimens were then subjected to the compression test and their force-displacement curves were experimentally obtained. Additionally, the effect of the middle layer thickness on the energy abortion performance was studied by numerical simulation using Ls-Dyna explicit code. The numerical model was initially validated by experiment. In conclusion, it was found that the maximum and minimum efficiency were determined for the FML specimen made of Carbon-epoxy and foam, respectively. Moreover, by changing the middle layer thickness, it was numerically demonstrated that the specimen with three layers of the same thickness yields the best absorption energy capability.

کلیدواژه‌ها [English]

  • Fiber metal laminates
  • energy absorption
  • numerical simulation
  • Composite materials

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