中文摘要：

在这份报纸，整洁的聚乙烯(PE ) 和与 25wt% POSS (POSS-PE ) 合并的聚乙烯的二个模型上的 nanoindentation 模拟被执行揭示机械性质的增强的机制。nanoindentation 上的 indenter 形状的影响被使用钻石 indenters (立方体角落 indenter，有球形的尖端的圆柱的 indenter 和有扁平的尖端的圆柱的 indenter ) 的三不同形状研究。分子的力学方法被采用消除温度效果。在不同 indenters，负担排水量回答，坚硬(缩进坚硬和貂坚硬) 和幼仔下面是 PE 的 moduli， POSS-PE 被获得。与 PE 相比，所有机械性质戏剧性地被改进。然后，我们分析装载落下现象和 POSS 的改进机制的来源。而且，结果证明 indenters 的不同形状在缩进坚硬上引起大影响，但是有点影响貂坚硬。并且幼仔扁平的 indenter 的模量比立方体角落 indenter 和球形的 indenter 的大得多。

英文摘要：

In this paper,the nanoindentation simulation on the two models of neat polyethylene（PE） and the polyethylene incorporated with 25wt% POSS（POSS-PE） is performed to reveal the reinforcing mechanism of the mechanical properties.The influence of the indenter shapes on nanoindentation is researched by using three different shapes of diamond indenters（cube-corner indenter,cylindrical indenter with spherical tip and cylindrical indenter with flat tip）.The molecular mechanics method is adopted to eliminate the temperature effects.Under different indenters,the load-displacement responses,hardnesses（indentation hardness and Martens hardness） and Young＇s moduli of PE and POSS-PE are obtained.Compared with PE,all the mechanical properties are improved dramatically.Then,we analyze the source of loading drop phenomena and the enhancement mechanism of POSS.Furthermore,the result shows that the different shapes of indenters cause a large impact on indentation hardness,but a little impact on Martens hardness.And Young＇s modulus of the flat indenter is much larger than that of cube-corner indenter and spherical indenter.