Factors Affecting Spherical Nano-Indentaton of Thin Film/Substrate System

Awlad Hossain, Ahsan Mian

Research output: Contribution to journalArticlepeer-review

Abstract

Great interests have been made over the last few years in the development of techniques to measure the

mechanical properties of many engineering materials at the nano scale. In nano-indentation, a hard tip with known mechanical properties is pressed into a sample whose properties are unknown. The load, indentation depth and deformed area resulting from this test are then used to determine the desired mechanical properties, such as hardness and modulus. In this study, the computer-based finite element analysis (FEA) method is used to investigate factors effecting nano-indentation to ensure reliable measurement of thin film properties. First, the FEA method is used to predict the mechanical response of bulk aluminum (Al) using a spherical indenter. The numerical prediction is then compared with existing published results to validate the FEA modeling scheme. Once the model is validated, additional numerical analyses are conducted to investigate the response of Al-film deposited on different substrate materials. New mathematical formulations are proposed to determine the film modulus from nano-indentation test. The film modulus obtained from the new and existing mathematical formulations are also compared. Results obtained from this research can be used to characterize the mechanical properties of soft biological materials such as biofilm or tissue scaffolds.

Copyright © 2014 by ASME

Original languageAmerican English
JournalASME 2014 International Mechanical Engineering Congress and Exposition
Volume10 - Micro- and Nano-Systems Engineering and Packaging
DOIs
StatePublished - Nov 14 2014

Keywords

  • Nanoindentation
  • Thin films

Disciplines

  • Engineering
  • Materials Science and Engineering
  • Mechanical Engineering

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