The effects of several parameters on the erosive wear were studied using the discrete element method(DEM).The Finnie model was implemented using an open‐source code.Regarding the time integration,the Gear algorithm w...The effects of several parameters on the erosive wear were studied using the discrete element method(DEM).The Finnie model was implemented using an open‐source code.Regarding the time integration,the Gear algorithm was used,and to ensure the accuracy of the DEM results,a time‐step sensitivity analysis was performed.The problem was modeled in two parts:first,the impact of a single particle on a surface was modeled,and then a more general model was prepared to examine the wear of surfaces under the flow of particles.The effects of the surface area,impact angle,speed,particle size,particle density,Young’s modulus,Poisson’s ratio,and restitution coefficient on the wear were studied numerically,and the results are discussed herein.展开更多
综述了F inn is-S inc lair多体势的发展,给出了F inn is-S inc lair多体势的各种势函数形式及几种纯金属及合金的F-S多体势参数;阐述了各种形式势函数的适用范围及其存在的问题;讨论了F inn is-S in-c lair多体势在纯金属、二元合金及...综述了F inn is-S inc lair多体势的发展,给出了F inn is-S inc lair多体势的各种势函数形式及几种纯金属及合金的F-S多体势参数;阐述了各种形式势函数的适用范围及其存在的问题;讨论了F inn is-S in-c lair多体势在纯金属、二元合金及三元合金中的应用情况;在此基础上,通过晶格常数a0、结合能E及体弹性模量B拟合了FeA l合金的F inn is-S inc lair多体势,并计算了B2型FeA l有序合金的缺陷性能,计算结果与实验结果一致.展开更多
The melting behaviour of four typical core-shell structured 309-atom Ag-Rh bimetallic clusters, with decahedral and icosahedral geometric configurations, is investigated by using molecular dynamics simulation, based o...The melting behaviour of four typical core-shell structured 309-atom Ag-Rh bimetallic clusters, with decahedral and icosahedral geometric configurations, is investigated by using molecular dynamics simulation, based on the Sutton-Chen potential. The initial atomic configurations are obtained from semi-grand canonical ensemble Monte Carlo simulations. It is found that the melting point temperature Tm increases with the mole fraction of Rh in the bimetallic clusters, and Tm of Ag-Rh icosahedral clusters is higher than those of Ag-Rh decahedral clusters with the same Rh mole fraction. It is also found that the Ag atoms lie on the surface of Ag-Rh bimetallic clusters even after melting.展开更多
基金financially supported by the Iran National Science Foundation(INSF)under Grant No.93038047
文摘The effects of several parameters on the erosive wear were studied using the discrete element method(DEM).The Finnie model was implemented using an open‐source code.Regarding the time integration,the Gear algorithm was used,and to ensure the accuracy of the DEM results,a time‐step sensitivity analysis was performed.The problem was modeled in two parts:first,the impact of a single particle on a surface was modeled,and then a more general model was prepared to examine the wear of surfaces under the flow of particles.The effects of the surface area,impact angle,speed,particle size,particle density,Young’s modulus,Poisson’s ratio,and restitution coefficient on the wear were studied numerically,and the results are discussed herein.
文摘综述了F inn is-S inc lair多体势的发展,给出了F inn is-S inc lair多体势的各种势函数形式及几种纯金属及合金的F-S多体势参数;阐述了各种形式势函数的适用范围及其存在的问题;讨论了F inn is-S in-c lair多体势在纯金属、二元合金及三元合金中的应用情况;在此基础上,通过晶格常数a0、结合能E及体弹性模量B拟合了FeA l合金的F inn is-S inc lair多体势,并计算了B2型FeA l有序合金的缺陷性能,计算结果与实验结果一致.
基金Supported by the National Natural Science Foundation of China under Nos 20236010 and 20476004, and the National Basic Research Programme of China under Grant No G2003CB615807.
文摘The melting behaviour of four typical core-shell structured 309-atom Ag-Rh bimetallic clusters, with decahedral and icosahedral geometric configurations, is investigated by using molecular dynamics simulation, based on the Sutton-Chen potential. The initial atomic configurations are obtained from semi-grand canonical ensemble Monte Carlo simulations. It is found that the melting point temperature Tm increases with the mole fraction of Rh in the bimetallic clusters, and Tm of Ag-Rh icosahedral clusters is higher than those of Ag-Rh decahedral clusters with the same Rh mole fraction. It is also found that the Ag atoms lie on the surface of Ag-Rh bimetallic clusters even after melting.
