کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5014433 1463298 2017 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Geometrical distortion leads to Griffith strength reduction in graphene membranes
ترجمه فارسی عنوان
اعوجاج هندسی منجر به کاهش قدرت گریفیت در غشاهای گرافنی می شود
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
چکیده انگلیسی
Geometrical distortion plays an important role in modulating the mechanical responses of low-dimensional materials. Upon a structural transition from planar to non-planar conformations, the elastic energy stored in a membrane will be redistributed in between the stretching and bending modes of deformation. In this work, we present a molecular simulation based study that demonstrates remarkable reduction in the Griffith strength of graphene with the presence of out-of-plane distortion. The reduction is much more significant in mode II crack where the wrinkles are delocalized compared to the results for mode I crack where localized buckles are activated. Atomistic stress analysis and theoretical models based on the linear elastic fracture mechanics explain this strength reduction as a consequence of the out-of-plane distortion that releases in-plane elastic deformation, and predict the mechanical resistance of crack-containing graphene membranes. These findings are important for using graphene, and in general two-dimensional materials, as structural or functional membrane components where the non-planar distortion in unavoidable.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Extreme Mechanics Letters - Volume 14, July 2017, Pages 31-37
نویسندگان
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