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梯度纳米晶体镍的力学行为数值模拟研究

发表时间:2018-01-15  浏览量:526  下载量:26
全部作者: 赵彦杰,周剑秋
作者单位: 南京工业大学机械与动力工程学院;武汉工程大学机电工程学院
摘 要: 纳米晶体材料具有高强度、高硬度和高耐磨性等优点,但高强度伴随着较低的韧性,这已经成为纳米晶体材料进一步研发和大规模工程应用的主要瓶颈。本文主要采用有限元数值模拟方法以铜基体纳米晶体镍涂层复合材料为对象研究梯度纳米晶体材料分布的微观力学响应,并探讨梯度结构对纳米晶体材料局部塑性变形的影响。结果表明,梯度纳米晶体镍表现出更加优异的力学性能。梯度纳米晶体镍在拉伸过程中会出现应变梯度和应力梯度,且随着拉伸应变的增大,应变梯度和应力梯度会逐渐增大,将进一步导致材料非局部的硬化效应,从而提高材料的延展性。
关 键 词: 固体力学;有限元模拟;梯度材料;应力梯度;应变梯度
Title: Numerical simulation study of mechanical behavior of gradient nanocrystalline nickel
Author: ZHAO Yanjie, ZHOU Jianqiu
Organization: School of Mechanical and Power Engineering, Nanjing Tech University; School of Mechanical and Electrical Engineering, Wuhan Institute of Technology
Abstract: Nanocrystalline materials express extraordinarily high strength, high hardness and good wear resistance. However, these outstanding mechanical properties are companied by lower ductility, which has been the obvious limitation for further research and the large-scale engineering application. Finite element numerical simulation method is used to investigate the micromechanical response of gradient nanocrystalline materials and the effect of gradient structural on the local plastic deformation in nanocrystalline materials is further discussed through the structural of Cu substrate nanocrystalline nickel coating composite materials. The results reveal that gradient nanocrystalline nickel expresses more powerful mechanical properties. The finite element analysis results reveal that the stress gradient and strain gradient emerge during the tensile elongation and increase with the increasing tensile strain, further induce non-local hardening effect, and thereby enhance the ductility of the materials.
Key words: solid mechanics; finite element simulation; gradient materials; stress gradient; strain gradient
发表期数: 2018年1月第1期
引用格式: 赵彦杰,周剑秋. 梯度纳米晶体镍的力学行为数值模拟研究[J]. 中国科技论文在线精品论文,2018,11(1):46-51.
 
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