Strength and failure behavior of a graphene sheet containing bi-grain-boundaries
Strength and failure behavior of a graphene sheet containing bi-grain-boundaries
复制标题
DOI：
10.1039/c4ra10126j
复制
发表时间：
2014-10
期刊：
影响因子：
3.9
通讯作者：
Bao-cheng Yang;Shuaiwei Wang;Yanzhen Guo;Jinyun Yuan;Yubing Si;Shouren Zhang;Houyang Chen
中科院分区：
文献类型：
--
作者：
Bao-cheng Yang;Shuaiwei Wang;Yanzhen Guo;Jinyun Yuan;Yubing Si;Shouren Zhang;Houyang Chen
采用分子动力学模拟方法，研究了含双晶界的石墨烯薄板的力学性能和破坏机理。结果表明，温度和缺陷密度对含双晶界的石墨烯的力学特性起着核心作用。随着温度的升高，材料的抗拉强度和断裂应变显著降低。含高密度缺陷的石墨烯比含低密度缺陷的石墨烯强度大得多。此外，还研究了杨氏模数与温度的关系。结果还表明，含双晶界的石墨烯板材的破坏过程以脆性开裂为主。
By using molecular dynamics simulations, the mechanical properties and failure mechanisms of a graphene sheet containing bi-grain-boundaries were examined. The results reveal that both temperature and density of defects play central roles in the mechanical characteristics of graphene containing bi-grain-boundaries. By increasing the temperature, the tensile strength and fracture strain significantly decrease. The graphene containing high density defects is much stronger than that containing lower density defects. The dependence of Young's modulus on temperature is also investigated. The results also show that the failure processes of graphene sheets containing bi-grain-boundaries are dominated by brittle cracking.