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NANOINDENTATION SIMULATION OF PE/POSS UNDER DIFFERENT SHAPES OF INDENTERS

查看全文 作　　者：Enlai [1]Hu;Yi [1]Sun;Fanlin [1]Zeng;Jianmin [2]Qu 高影响力作者 机构地区：[1]Department of Astronautic Science and Mechanics,Harbin Institute of Technology,Harbin 150001,China;[2]Northwestern University,Department Civil & Environment Engineering,Evanston,IL 60208 USA高影响力机构 出　　处：《Acta Mechanica Solida Sinica》索引2011年第24卷第4期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (No. 10972066);the Doctoral Program Foundation of Institutions of Higher Education of China (No. 20070213054);the Natural Science Foundation of the Heilongjiang Province of China (A2007-10);the Fundamental Research Funds for the Central Universities (No. HIT.NSRIF. 2010070) 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. 关 键 词：纳米压痕 POSS 压痕形状 压头 PE 模拟 压痕硬度 增强机制
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