علوم و فناوری کامپوزیت

مطالعه تجربی و عددی اثر وجود و جهت‌گیری آوندهای شیشه‌ای بر رفتار کششی کامپوزیت اپوکسی-الیاف شیشه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری ، مهندسی مکانیک ، دانشگاه تبریز ، تبریز

2 دانشیار ، مهندسی مکانیک ، دانشگاه تبریز ، تبریز

3 استاد ، مهندسی مکانیک ، دانشگاه تبریز ، تبریز

4 استاد ، مهندسی مکانیک ، دانشگاه امیرکبیر ، تهرا ن

10.22068/jstc.2020.115583.1594

چکیده

در سالهای اخیر، پژوهش‌های متعددی در زمینه خودترمیمی با استفاده از شبکه‌ آوندی در کامپوزیت‌ها انجام شده است. با توجه به اینکه وجود شبکه آوندی در کامپوزیت‌ها منجر به افت خواص مکانیکی اولیه می‌شود، تعیین طرح بهینه شبکه آوندی برای دستیابی به حداقل افت خواص، اهمیت بسزایی دارد. در این پژوهش، به مطالعه تجربی و عددی اثر وجود و جهت‌گیری آوندهای شیشه‌ای توخالی بر رفتار کششی در کامپوزیت‌ اپوکسی- الیاف شیشه پرداخته شده است. جهت‌گیری آوند‌های شیشه در سه سطح 0، 45 و 90 درجه نسبت به راستای الیاف شیشه تقویت‌کننده، و فاصله آوندها از یکدیگر 200 میکرومتر در نظر گرفته شد. نتایج آزمون‌های تجربی نشان داد که وجود آوندهای شیشه‌ای در کامپوزیت باعث افت خواص کششی می‌شود و کمترین کاهش خواص کششی در نمونه کامپوزیتی حاوی آوندهای شیشه‌ای در راستای 45 درجه است. وجود و شکست آوندهای شیشه‌ای در نمونه‌های کامپوزیتی با استفاده از میکروسکوپ الکترونی روبشی مطالعه شد. در مرحله بعد، شبیه‌سازی المان محدود سه‌بعدی با استفاده از المان حجمی نماینده، برای نمونه‌های حاوی سیستم آوندی توخالی با جهت‌گیری‌های مختلف با استفاده از نرم‌افزار ABAQUS انجام شد. برای شبیه‌سازی فصل مشترک آوند شیشه‌ای-رزین اپوکسی، از ترکیب همزمان مدل‌های ناحیه چسبان و اصطکاکی کولمب استفاده شد. نتایج شبیه‌سازی نشان دهنده اختلاف جزیی در مقادیر استحکام کششی پیش‌بینی شده با مقادیر تجربی است. در مرحله بعد، عملکرد خودترمیم در کامپوزیت حاوی آوندهای شیشه پرشده با مواد خودترمیم با جهت‌گیری 45 بطور تجربی بررسی شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental and Numerical Studies on the Effect of Hollow Glass Fiber Presence and Orientation on the Tensile Behavior of Epoxy/Glass Fiber Composite

نویسندگان [English]

  • Alireza Adli 1
  • Karim Shelesh-Nezhad 2
  • Mohammad Reza Khoshravan Azar 3
  • Mohammad Mohammadi-Aghdam 4

1 Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran

2 Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran

3 Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran

4 Faculty of Mechanical Engineering, Amirkabir University, Tehran, Iran.

چکیده [English]

In recent years, numerous investigations have been conducted on self-healing process using vascular network in composites. Since the vascular network in the composites leads to a decrease in virgin tensile properties, it is important to determine the optimal design of the vascular network in order to achieve minimum tensile properties loss. In this research, experimental and numerical studies on the effect of hollow glass fiber (HGF) presence and orientation on tensile behavior in epoxy/glass fiber composite are carried out. The orientations of HGFs were selected at three levels of 0, 45 and 90°, and the distance of HGFs was kept at 200 μm. The experimental results indicated that the presence of blank HGFs in composite lowered the tensile strength. The lowest decrease in tensile strength was observed in the composite containing HGF at angle of 45°. The presence and failure of HGFs in composite specimens were studied using scanning electron microscopy. Next, three-dimensional simulations of composite containing vascular HGF were performed using ABAQUS software and representative volume element (RVE). To simulate the interface of HGFs and epoxy matrix, a combination of cohesive zone and Columb’s friction models was used. A good agreement between FEM and experimental results for tensile strength of different specimens was observed. Next, the healing performance for composite containing self-healing HGFs at angle of 45° was investigated.

کلیدواژه‌ها [English]

  • "Epoxy-glass composite"
  • "Hollow glass fiber"
  • "Tensile behavior"
  • "Simulation"
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علوم و فناوری کامپوزیت
دوره 7، شماره 2
شهریور 1399
صفحه 881-890
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هم رسانی
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