سال انتشار: ۱۳۹۱

محل انتشار: بیستمین کنفرانس سالانه مهندسی مکانیک

تعداد صفحات: ۵

نویسنده(ها):

Seyed Hadi GHADERI – Department of Mechanical Engineering, Shahrood University of Technology
Ehsan HAJIESMAILI – Department of Mechanical Engineering, Shahrood University of Technology

چکیده:

This paper investigates mechanical properties of armchair coiled carbon nanotubes by means of molecular structural mechanics method, whereby atomic interactions can be modeled using beam elements. To specify the geometry of coiled carbon nanotubes, a construction procedure is proposed which offers a full control over the morphology of the coiled nanotubes. This construction approach consists of three steps. First a development map is drawn on a graphene sheet, and then this graphene sheet is rolled to form a defected straight carbon nanotube; finally, the sides of these defects are stuck together through a nonlinear analysis, with the result that the straight carbon nanotube forms into coiled carbon nanotube. Accordingly, several coiled nanotubes are built and their spring constants are calculated. It is shown that the spring constants foundare in good agreement with those obtained from density function theory and tight-binding calculations reported in the literature. The results also reveal that, as the tube diameter increases, spring constant of the coiled carbon nanotube increases, constantly