نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، انشکده مهندسی ، دانشگاه صنعتی خواجه نصیر الدین طوسی، تهران، ایران

2 دانشیار، دانشکده مهندسی ، دانشگاه صنعتی خواجه نصیر الدین طوسی، تهران، ایران

چکیده

در این تحقیق تلاش شده است، عوامل موثر بر خواص مکانیکی و مکانیزم شکست نانوکامپوزیت پلیمری تقویت‌شده با نانولوله‌های کربنی سالم و عامل‌دار شده مورد ارزیابی قرار گیرد. مدل‌سازی در دو فاز نانو و میکرو انجام‌شده که اثر نقص‌های ساختاری حفره و پیوند‌های کوالانسی ناشی از فرآیند عامل‌دار کردن نانولوله‌ها در فاز نانو و نحوه توزیع، شکل و انحنای نانولوله‌ها در فاز میکرو نیز بررسی شده است. مشاهده می‌شود که با توجه به عواملی همچون توزیع، اعوجاج و عامل‌دار شدن نانولوله‌های کربنی، امکان کاهش یا افزایش استحکام نانوکامپوزیت‌های پلیمری در مقابل پلیمر خالص وجود دارد. همچنین عامل‌دار کردن نانولوله‌های کربنی باعث بهبود استحکام نانوکامپوزیت پلیمری شده و شکنندگی آن‌ها را کاهش می­دهد. از سوی دیگر، نقص­های ساختاری ایجادشده در پروسه عامل‌دار کردن نانولوله‌های کربنی، باعث کاهش مدول الاستیسته نانوکامپوزیت می‌شود. همچنین چنان‌چه انحنای نانولوله‌های کربنی تقویت‌کننده نانوکامپوزیت پلیمری افزایش یابد، اثر بهبود دهنده عامل‌دار کردن نانولوله‌های کربنی کاهش چشمگیری می‌یابد و به خواص نانوکامپوزیت تقویت‌ شده با نانولوله‌های سالم نزدیک می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Multiscale modeling of fracture in polymer nanocomposite reinforced by intact and functionalized CNTs

نویسندگان [English]

  • AmirHossein Esbati 1
  • Saied Irani 2

1 Faculty of Aerospace, K. N. Toosi University of Technology, Tehran, Iran

2 Faculty of Aerospace, K. N. Toosi University of Technology, Tehran, Iran

چکیده [English]

In this research, mechanical properties and fracture mechanism of polymer nanocomposite reinforced by carbon nanotubes (CNTs) has been evaluated employing multiscale modeling method. Effect of CNTs’ structural defects and covalent bonds created during functionalization process are investigated in nanoscale analysis and the effect of CNTs’ dispersion, curvature and volume fraction are studied in microscale analysis. In microscale modeling both analytical and finite element methods are employed to investigate mechanical properties and their results are compared. It has been investigated that, according to mentioned parameters such as CNTs’ dispersion, volume fraction, functionalization and curvature in polymer matrix, both increase and decrease in ultimate strength of polymer nanocomposite are possible with respect to pure polymer. Moreover, polymer nanocomposite’s ultimate strength is increased and fracture brittleness is decreased significantly using functionalized CNTs. On the other hand, the CNT’s structural defects caused during functionalization process decrease polymer nanocomposite Young’s modulus. It also has been demonstrated that by increasing curvature, the improving effects of functionalized CNTs on mechanical properties of polymer nanocomposite, decrease obviously.

کلیدواژه‌ها [English]

  • Polymer nanocomposite
  • multiscale modeling
  • Functionalized and intact CNTs
  • Analytical and finite element methods

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