پایش وضعیت اتصالات چسبی تک‌لبه معیوب با استفاده از نانولوله‌های کربنی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکتری، دانشکده مهندسی مکانیک، پردیس دانشکده های فنی، دانشگاه تهران، تهران، ایران

2 دانشیار، دانشکده مهندسی مکانیک، پردیس دانشکده های فنی، دانشگاه تهران، تهران، ایران

چکیده

اتصالات چسبی در سازه‌های مهندسی بویژه درصنایع دریایی، هوافضا، خودروسازی، نفت و گاز به‌کار می‌روند. با توجه به اینکه اتصال ضعیف‌ترین بخش یک سازه مهندسی محسوب می‌شود، احتمال شکست از محل اتصال چسبی بالا است. بنابراین، پایش وضعیت اتصال چسبی از اهمیت ویژه‌ای برخودار است. هدف از این مقاله، پایش وضعیت آسیب در اتصال چسبی تک لبه با استفاده از نانولوله‌های کربنی چند جداره است. این کار با روش ثبت تغییرات مقاومت الکتریکی طی بارگذاری مکانیکی انجام شده است. این انتشار آسیب به صورت انتشار ترک در اتصال چسبی مشاهده شده است. در ابتدا نانولوله‌های کربنی  با 9 درصد وزنی با استفاده از دستگاه آلتراسونیک درون رزین اپوکسی پراکنده شدند. پس از اضافه‌نمودن سخت‌کننده، ماده بدست‌آمده بلافاصله درون قالب اتصال چسبی تک‌لبه ریخته شد. اتصال چسبی معیوب با سطح عیب %10، %30 و %70 و با عیب‌های دایره‌ای و مربعی ساخته شد. این نمونه‌ها تحت آزمون کشش، قرارگرفته و پاسخ مقاومت الکتریکی آن تحت بارگذاری برشی ثبت شد. نتایج نشان داد که بیشترین تغییرات کلی مقاومت در نمونه اتصال چسبی با اندازه عیب 30 درصد مربعی اتفاق افتاده و بخش زیادی از پیشرفت آسیب به صورت انتشار ترک در چسب رسانا مشاهده شد. نتایج بدست‌آمده نشان داد که زمانی که بخش بزرگی از ترک درون چسب و بخش اندکی از آن در مرز عیب رشد می‌کند، بیشترین تغییرات کلی مقاومت مشاهده می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Condition monitoring of defective single lap adhesive joint using carbon nanotubes

نویسندگان [English]

  • Omid Sam Daliri 1
  • Mohammadreza Farahani 2
1 PhD, School of Mechanical Engineering, College on Engineering, University of Tehran, Tehran, Iran.
2 Associate professor, School of mechanical engineering, College of engineering, University of Tehran, Tehran, Iran.
چکیده [English]

Adhesive joints have been employing in engineering structures such as marine, aerospace, automotive, oil, and gas industry. Since the joints are the weakest part of engineering structures, the fracture possibility in the adhesive joint is high. Therefore, structural health monitoring of adhesive joint is an important issue. The aim of this paper was condition monitoring of damage in the single lap adhesive joint by multiwall carbon nanotubes. This work is carried out by recording the electrical resistance change during the mechanical loading. This damage propagation is observed as a crack extension in the adhesive joint. Firstly, carbon nanotubes with 9 wt.% are dispersed in an epoxy resin by an ultrasonic device. Then, the hardener is added to the nono-adhesive. The obtained material is immediately poured into a single lap adhesive joint mold. The defective adhesive joints were manufactured with circular and square defects in different sizes i.e. 10%, 30%, and 70% overlap area. The specimen is subjected to a tensile test and electrical resistance changes are recorded during the shear load. The results showed that the maximum value of relative resistance change is occurring in the adhesive joint comprises of square defect with 30% overlap area of defect. In this situation, the crack was propagated in nano-adhesive and a small part of a crack was extended from the defect boundary.

کلیدواژه‌ها [English]

  • Condition monitoring
  • Damage sensing؛ Carbon nanotube
  • Adhesive joint
  • Sensor

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 53، شماره 2 (Special Issue)
اردیبهشت 1400
صفحه 1321-1330

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