Stress Concentration Factor of Single-Layered Graphene Sheets Containing Elliptical Vacancies
عنوان مقاله: Stress Concentration Factor of Single-Layered Graphene Sheets Containing Elliptical Vacancies
شناسه ملی مقاله: JR_JSMA-11-3_015
منتشر شده در شماره 3 دوره 11 فصل در سال 1398
شناسه ملی مقاله: JR_JSMA-11-3_015
منتشر شده در شماره 3 دوره 11 فصل در سال 1398
مشخصات نویسندگان مقاله:
S.K Jalali - Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran
M.J Beigrezaee - Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran
خلاصه مقاله:
S.K Jalali - Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran
M.J Beigrezaee - Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran
In the present study, potential of finite element based molecular structural mechanics (MSM) for evaluating stress concentration factor of single-layered graphene sheets (SLGSs) with elliptical vacancies is successfully addressed. The MSM approach mimics the interatomic forces of the nanostructure by defining an equivalent frame structure containing beam elements. To obtain the mechanical and cross sectional properties of the equivalent beam, the potential energies of chemical bonds between carbon atoms in the hexagonal lattice of SLGSs are equaled to the strain energies of the beams. This novel proposed approach accurately predicts the stress concentration in graphene sheets with significantly less computational effort in comparison to computational physics methods. Both armchair and zigzag configurations are considered. Furthermore, a comparison between the results obtained by presented MSM approach and theory of elasticity for thin infinite panels having elliptical holes is presented. Influence of chirality, and geometry of elliptical vacancies are investigated in details. Results reveal that MSM approach can successfully predicts stress concentration factor phenomena in nano structures, especially SLGSs. It is seen that chirality has a significant effect on the stress concentration factor so that armchair SLGSs show a larger value of stress concentration.
کلمات کلیدی: Defected grapheme, Elliptical vacancies, Molecular structural mechanics, Stress Concentration Factor, Finite Element Method
صفحه اختصاصی مقاله و دریافت فایل کامل: https://civilica.com/doc/999236/