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总览 评价 龙述尧 , 童杰 * , 曾塬 ( 湖南大学汽车先进设计和制造技术国家重点实验室; ) 摘要: 本文采用分子动力学研究了纳米板在拉伸的作用下裂纹扩展。采用Lennard-Jones势模型描述原子间作用,同时,基于二维密排矩形晶格常数计算材料弹性参数。在拉
龙述尧, 童杰*, 曾塬
(
湖南大学汽车先进设计和制造技术国家重点实验室; )
摘要:
本文采用分子动力学研究了纳米板在拉伸的作用下裂纹扩展。采用Lennard-Jones势模型描述原子间作用,同时,基于二维密排矩形晶格常数计算材料弹性参数。在拉应力的作用下,垂直于拉应力方向裂纹的产生。同时,在可以保持裂纹张开力的作用下,裂纹一直在一个方向上扩展。用分子动力学模拟纳米板裂纹起始扩展的裂尖应力场和原子平均能量,可以准确地描述Ⅰ型裂纹扩展的物理本质。因此,基于原子势函数分析也是一种可行的研究纳米材料断裂的方法。。
关键词:
分子动力学;Ⅰ型裂纹;裂纹扩展;晶格常数
LONG Shuyao, TONG Jie*, ZENG Yuan
(
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University; )
Abstract:
The crack propagation of nano-plate are studied by the molecular dynamics (MD) method. Adopt Lennard - Jones potential model describes the atomic interaction, and at the same time, based on two-dimensional densely rectangular lattice constant calculation material elastic parameters。 In the y to stress, under the action of tensile stress direction perpendicular to the fatigue. Meanwhile, in can keep crack tensile, under the action of crack in a direction has been expanded. The crack propagation of nano-plate the crack tip stress and atomic average energy By molecular dynamics simulation , can accurately describe Ⅰ type crack propagation physical essence. Therefore, based on atomic potential function analysis is also a feasible study the nanometer material fracture method.?????
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