摘要
采用基于直纳米碳管拉伸曲线与单元“死亡”技术的非线性有限元方法模拟了“Y”形、竹节形与直纳米碳管的拉伸失效过程。对比并讨论了“Y”形、竹节形纳米碳管与直碳管的拉伸力学性能。研究表明 ,本文的非线性有限元方法能够有效模拟纳米碳管的拉伸力学特性 ;拉伸“Y”形、竹节形碳管的失效发生在其粗管与细管过渡的“应力集中”部位 ;“Y”形、竹节形碳管的抗拉强度与韧性明显低于直碳管 ;然而 ,“Y”形、竹节形碳管的弹性模量与直碳管相当。
On the basis of tensile curve of straight carbon nanotube and the “element-death” technology, one nonlinear FE (finite element) method is developed to simulate tensile “Y”-shaped, bamboo-shaped, and straight carbon nanotubes. According to the obtained FE results, mechanical properties of the carbon tubes are compared and analyzed. The study shows that, ①the present FE method is effective for the simulations of tensile nanotubes; ②fracture of “Y”-shaped and bamboo-shaped carbon nanotubes results from the “stress concentration” at the junctures of their thin and thick nanotubes; ③“Y”-shaped and bamboo-shaped carbon nanotubes have obviously lower tensile strength and ductility than straight nanotube has. However, “Y”-shaped, bamboo-shaped and straight carbon nanotubes seem to have no evident difference between their elastic modulus.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2005年第3期321-324,共4页
Journal of Materials Science and Engineering
关键词
“Y”形碳管
竹节形碳管
直纳米碳管
拉伸
有限元
Y”-shaped nanotube, bamboo-shaped nanotube, straight carbon tube, tensile, FE.
