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مقایسه‌ی بهبود استحکام حاصل از ایجاد شیار در صفحه خارجی چسبنده با پخ‌زدن چسبنده در اتصالات چسبی تک‌لبه‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران

2 استاد، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران

3 دانشجوی کارشناسی ارشد، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران

10.22068/jstc.2020.116795.1602

چکیده

در این پژوهش، برای ارزیابی بهبود استحکام اتصال چسبی تک‌لبه‌ای دو نوع از تغییر هندسی چسبنده به صورت عددی و آزمایشگاهی مورد مطالعه قرار گرفت. پخ‌زدن چسبنده و ایجاد شیار خارجی در چسبنده به عنوان روش‌هایی برای اصلاح اتصال چسبی تک‌لبه‌ای در نظر گرفته شد. زاویه‌ی پخ در چسبنده به صورتی انتخاب شد که سرتاسر طول همپوشانی توسط پخ پوشش داده شود. از طرف دیگر مقدار بهینه‌ی عمق، پهنا و فاصله از انتهای طول همپوشانی به عنوان متغیرهای اصلی شیار خارجی ایجاد شده در چسبنده توسط مدلسازی-های اجزاءمحدود به دست آمد. سپس، اتصالات چسبی تک‌لبه‌ای شامل اتصال ساده و اتصالات بهبود یافته با روش پخ زدن و ایجاد شیار ساخته و آزمون تجربی گرفته شدند. نتایج آزمایشگاهی نشان می-دهد که هر دو روش پخ‌زدن چسبنده و شیاردار کردن چسبنده، استحکام اتصال چسبی را به طور قابل توجهی افزایش می‌دهند. همچنین بار شکست اتصالاتی که توسط پخ اصلاح شده بودند اندکی از بار شکست اتصالاتی که با شیار بهبود داده شده بودند کمتر بود که نتایج عددی نیز این نکته را نشان می‌دهد. نتایج تحلیل‌های اجزا محدود و تست‌های تجربی صورت گرفته نشان می‌دهد که هر دو روش ایجاد شیار در سطح خارجی چسبنده و پخ زنی چسبنده می-توانند به میزان قابل توجهی استحکام اتصال را بهبود دهند

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Strength improvement by mean of adherend notching and adherend taper in the adhesive single lap joints

نویسندگان [English]

  • Bahador Bahrami 1
  • Majid Reza Ayatollahi 2
  • Mohammad Javad Beigrezaee 3

1 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

2 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

3 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

چکیده [English]

In this paper, in order to evaluate the strength improvement of adhesive single lap joints (SLJs), two kinds of adherend geometrical modifications were studied numerically and experimentally. Adherend tapering and adherend notching were considered as the SLJ modification approaches. The taper angle was assumed so that the whole overlap length covered by the taper. On the other side, the optimum values for depth, width and distance from overlap ends as the major notch parameters were acquired by using finite element simulation. Then, the simulated SLJs including an unmodified joint and the modified ones with taper and notch were fabricated and experiments were performed on them. The experiments revealed that both adherend tapering and adherend notching modification methods increase the SLJs strength significantly. In addition, the failure loads of the SLJs with taper modification are a bit less than the failure loads of the ones with notch modification. A similar observation was seen in the results of finite element analyses. The finite element analysis and the experimental results showed that both outer notch and taper modification method could increase the strength of the SLJs significantly.

کلیدواژه‌ها [English]

  • Adhesive single lap joint
  • Strength improvement
  • Finite element method
  • Experimental method
مراجع
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