تحلیل تئوری، آزمایشگاهی و عددی رفتار سازه‌های اتصال چسبی جدار نازک آلومینیوم -کامپوزیت تحت بارگذاری محوری

نوع مقاله : مقاله مکانیک

نویسندگان

دانشکده مهندسی خودرو، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

در این تحقیق، با استفاده از مزایای اتصال چسبی، تقویت موضعی جاذب انرژی آلومینیوم مربعی‌شکل توسط کامپوزیت صورت‌گرفته است. در این رابطه یک تحلیل تئوری برای پیش‌بینی نیروی متوسط لهیدگی سازه­های هیبریدی پیشنهاد شده است. صحت‌ مدل تئوری با نتایج تجربی تأیید شده ‌است. در این مطالعه چهار کامپوزیت ال - شکل با استفاده از چسب آرالدیت ۲۰۱۵ به‌صورت موضعی به چهارگوشه از داخل سازه آلومینیومی متصل شده‌اند. مدل المان محدود برای تحلیل این ساختارهای هیبریدی توسعه داده شده است. پنج حالت مختلف از زاویه چینش الیاف [15 و 15-] ، [45 و 45-]، [90 و 90]، [90 و 0] و [0 و 90] برای کامپوزیت در نظر گرفته شده است. همین‌طور تعداد لایه‌های کامپوزیت از 2 تا 8 لایه متفاوت می‌باشند. مدل تئوری پیشنهادی می‌تواند به‌سرعت نیروی متوسط لهیدگی و انرژی مستهلک شده سازه را هنگامی که پارامترهای هندسی و خواص مکانیکی کامپوزیت و فلزات داده شده‌اند، پیش‌بینی کند. نتایج نشان داد که در مقایسه با جاذب‌های انرژی آلومینیوم و آلومینیوم - کامپوزیت، به دلیل اتصال چسبنده بین آلومینیوم و کامپوزیت در نمونه تقویت‌شده موضعی آلومینیوم -کامپوزیت، کامپوزیت با پیروی از الگوی فروریزش آلومینیوم و ایجاد حالت‌های شکست و فروریزش پیوسته، جذب انرژی را نسبت به حالت آلومینیوم تنها 155% و نسبت به حالت آلومینیوم - کامپوزیت 22% افزایش داد. در میان حالت‌های انتخابی، تعداد بهینه لایه‌های کامپوزیتی برای جاذب انرژی تقویت‌شده موضعی آلومینیوم - کامپوزیت، ۴ لایه و  زاویه بهینه برای تقویت داخلی [0 و 90] است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Theoretical, Experimental and Numerical Analysis of Behavior of Adhesive Bonded Joints Thin-Walled Aluminum-Composite Structures Under Axial Loading

نویسندگان [English]

  • Hamed Saeidi Googarchin
  • Reza Rahmani
School of Automotive Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

Aluminum-composite hybrid structures have the ability to absorb high energy under crushing axial load. In this research, by using the advantages of adhesive bonding, the local reinforcement of square aluminum energy absorber has been done by composite. In this regard, a theoretical analysis has been proposed to predict the average collapse force of hybrid structures. The validity of the theoretical model has been confirmed by experimental results. In this study, four L-shaped composites are locally attached to the rectangle from inside the aluminum structure using Araldite 2015 glue. Finite element model is developed to analyze these hybrid structures. Five different modes of fiber arrangement angle [15,-15], [45,-45], [90,90], [0,90] and [0,90] are considered for the composite. Similarly, the number of composite layers varies from 2 to 8 layers. The proposed theoretical model can quickly predict the average collapse force and dissipated energy of the structure when the geometrical parameters and mechanical properties of the composite and metals are given. The results showed that compared to aluminum and aluminum-composite energy absorbers, due to the adhesive connection between aluminum and composite in the locally reinforced aluminum-composite sample, the composite absorbed energy by following the aluminum collapse pattern and creating continuous failure and collapse modes. It increased only 155.75% for aluminum and 22.99% for aluminum-composite. Among the selected cases, the optimal number of composite layers for locally reinforced aluminum-composite energy absorber is 4 layers and the optimal angle for internal reinforcement is [0,90].

کلیدواژه‌ها [English]

  • Hybrid thin-walled structure
  • Adhesive bonded joints
  • Theoretical model
  • local reinforcement
  • Crashworthiness
  • Ply angle composite
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