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Acta Mechanica Solida Sinica

, Volume 24, Issue 4, pp 365–372 | Cite as

Nanoindentation Simulation of PE/POSS under Different Shapes of Indenters

  • Enlai Hu
  • Yi Sun
  • Fanlin Zeng
  • Jianmin Qu
Article

Abstract

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.

Key words

molecular simulation nanoindentation shape of indenter hardness Young’s modulus 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics and Technology 2011

Authors and Affiliations

  1. 1.Department of Astronautic Science and MechanicsHarbin Institute of TechnologyHarbinChina
  2. 2.Department Civil & Environment EngineeringNorthwestern UniversityEvanstonUSA

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