بررسی خواص مکانیکی مواد مدرج پله‌ای پایه پلیمری تقویت شده با نانو لوله کربن با استفاده از آزمون خمش سه نقطه‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکتری مهندسی مکانیک / دانشکده مهندسی مکانیک، دانشگاه تبریز

2 دکتری مهندسی مواد / دانشکده مهندسی مکانیک، دانشگاه تبریز

3 عضو هیات علمی / گروه مهندسی مکانیک، جهاد دانشگاهی صنعتی شریف

چکیده

هدف از این مقاله، بررسی خواص مکانیکی مواد مدرج پله ای پایه اپوکسی تقویت شده با نانو لوله‌های کربنیاست. در این مطالعه، خواص مکانیکی با آزمون خمش سه نقطه بررسی شده است. روشی که در این تحقیق مورد استفاده قرار گرفته است روش های محاسبه مقدار چقرمگی شکست است. نمونه‌ها با شش درصد جرمی مختلف از نانو لوله‌های کربنی ساخته شده‌اند. درصدهای جرمی نانو لوله‌های کربنی عبارتند از 0%، 0/01%، 0/05%، 0/1%، 0/2%، 0/3%. از دستگاه اولتراسونیک برای توزیع یکنواخت و کاهش آگلومره شدن نانو لوله های کربن در زمینه اپوکسی استفاده شد. به منظور بررسی چقرمگی شکست، ترک های یکسان در دو جهت مختلف بر روی نمونه‌ها یکبار در سمت با درصد پایین  نانو لوله کربن و بار دیگر در سمت با درصد بالای  نانو لوله کربنایجاد شد. آزمایش خمش سه نقطه حداقل سه بار برای هر نمونه تکرار شد. برای هر ترک، مقادیر مختلف چقرمگی شکست و نیروهای شکست وجود دارد. علاوه بر این، سطح شکست نمونه‌ها با استفاده از میکروسکوپ الکترونی روبشی (SEM) مورد بررسی قرار گرفت. نتایج نشان داد که جهت ترک، درصد ذرات نانو لوله کربنی و پراکندگی نانو لوله‌های کربن پارامترهای مهم هستند به طوری که در مواد کامپوزیتی با تعداد لایه‌های بیشتر، چقرمگی شکست بالاتر بود و حضور درصد جرمی بالاتر از ذرات نانو لوله کربنی تنها منجر به بهبود استحکام تک لایه می‌شود و در افزایش چقرمگی کل ماده اثرگذار نیست. همچنین در این تحقیق، مدول الاستیسیته خمشی که متفاوت از مدول الاستیسیته کششی است، بررسی گردید.

کلیدواژه‌ها

عنوان مقاله [English]

Mechanical properties of nanocomposite based on epoxy using three point bending test

نویسندگان [English]

  • Sahar Moharrerzadeh Kurd 1
  • Ayda Shahriari 2
  • Ashkan Sepehrafghan 3
1 PhD in Mechanical Engineering / Department of Mechanical Engineering, Faculty of Mechanical Engineering, University of Tabriz
2 PhD in materials engineering, / Department of Materials Science and Engineering, Faculty of Mechanical Engineering
3 Assistant, / ACECR Sharif university branch, Tehran
چکیده [English]

The purpose of this paper is to investigate mechanical properties of nanocomposite based on epoxy reinforced with carbon nano tubes (CNTs). This study considers the mechanical properties by three point bending test. The technique which is used in this study is one of the methods to calculate fracture toughness value. The specimens with four different mass percentages of carbon nano tubes were made. The mass percentages are 0%,0.01%, 0.05%, 0.1%, 0.2% and 0.3%. An ultrasonic device was used to disperse the CNTs uniformly in the epoxy matrix. So, the agglomeration of the CNT particles decreased in the matrix. In order to investigate the fracture toughness, same size cracks were created in two different directions on the specimens including low CNTs content grade and high CNTs content grade. Three point bending test was repeated at least three times for each of specimens. For each crack, there are different values of the fracture toughness and the fracture forces. Furthermore, the fracture surfaces of samples were investigated using scanning electron microscopy (SEM). The results showed that the direction of the crack, CNTs content and dispersion of the carbon nano tubes are important parameters. Also, flexural elasticity modulus that is different from tensile elasticity modulus was considered in this research.

کلیدواژه‌ها [English]

  • polymer matrix composites؛ carbon nano tubes؛ mechanical properties
  • Bending test

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