刘晓波,熊震,方洲,李艳.含孔洞的Al2Cu单轴拉伸的分子动力学模拟[J].稀有金属材料与工程,2019,48(9):2745~2752.[Liu Xiaobo,Xiong Zhen,Fang Zhou,Li Yan.Molecular dynamics simulation of tension of Al2Cu with voids[J].Rare Metal Materials and Engineering,2019,48(9):2745~2752.]
含孔洞的Al2Cu单轴拉伸的分子动力学模拟
投稿时间:2018-04-15??修订日期:2019-08-11
中文关键词:??分子动力学模拟??拉伸??孔洞大小??孔洞数量??孔洞分布
基金项目:
中文摘要:
??????建立含孔洞的Al2Cu分子动力学模拟模型,采用嵌入原子法模拟Al2Cu模型在常温、恒定工程应变速率的拉伸环境下孔洞大小、数量及孔洞分布对Al2Cu力学性能的影响。研究结果表明:孔洞的出现使模型内部出现了自由表面并在孔洞内边缘产生了应力集中,从而大大降低材料的抗拉强度以及变形能力;孔洞增大,Al2Cu的塑性和抗拉强度均明显下降;不同孔洞数量对应的应力应变曲线在弹性变形阶段基本重合,孔洞增多,Al2Cu的塑性以及抗拉强度都有不同程度的下降;改变孔洞分布,孔洞连线方向与拉伸方向的夹角越小,Al2Cu表现出越强的塑性和抗拉强度。
Molecular dynamics simulation of tension of Al2Cu with voids
英文关键词:molecular dynamics simulation??tension??void size??void number??void distribution
英文摘要:
??????A molecules dynamic simulation model was established to simulate the tension of Al2Cu with voids under the environment of normal temperature and constant engineering strain rate. The influence of void size, quantity and its distribution on the mechanical properties of Al2Cu was studied by adopting embedded atomic method. The results show that the presence of void causes the appearance of free surface in the model and stress concentration at the inner edge of void, which greatly reduce the tensile strength and deformation ability of the material. In addition, the plastic and tensile strength of Al2Cu decrease obviously with the increase of void size. The stress-strain curves corresponding to different number of void are basically overlapped in the elastic deformation stage and both the plasticity and tensile strength decrease for more voids. According to the change of void distribution, it can be find that the smaller the angle between the direction of the connection of the voids and the direction of the tensile, the stronger the plasticity and tensile strength of Al2Cu
作者单位E-mail
刘晓波?南昌航空大学 航空制造工程学院?liuxb2000@sina.com?
熊震?南昌航空大学 航空制造工程学院??
方洲?南昌航空大学 航空制造工程学院??
李艳?南昌航空大学 航空制造工程学院??
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