Publication result detail

Modeling Load-displacement Curve and Pop-in Effect in Nanoindentation Tests

ŠANDERA, P.; POKLUDA, J.; SCHÖBERL, T.; HORNÍKOVÁ, J.; ČERNÝ, M.

Original Title

Modeling Load-displacement Curve and Pop-in Effect in Nanoindentation Tests

English Title

Modeling Load-displacement Curve and Pop-in Effect in Nanoindentation Tests

Type

WoS Article

Original Abstract

The nanoindentation test of a single crystal of tungsten is simulated by a multiscale model based on a nonlinear elastic finite element analysis coupled with both ab initio calculations of the ideal shear strength and crystallographic considerations. The onset of microplasticity, associated with the pop-in effect identified in experimental nanoindentation tests (creation of first dislocations), is assumed to be related to the moment of achieving the value of the ideal shear strength for the copper crystal under a superimposed hydrostatic stress. The calculated value of the critical indentation depth is in a very good correspondence with that of the experimentally observed pop-in on the load-displacement curve. The value of the Young modulus of tungsten received from the reduced modulus of elasticity of the original Hertz model is also in an excellent agreement with experimental data. This offers us a possibility to assess the concentration of alloying and impurity elements in the surface and sub-surface layers.

English abstract

The nanoindentation test of a single crystal of tungsten is simulated by a multiscale model based on a nonlinear elastic finite element analysis coupled with both ab initio calculations of the ideal shear strength and crystallographic considerations. The onset of microplasticity, associated with the pop-in effect identified in experimental nanoindentation tests (creation of first dislocations), is assumed to be related to the moment of achieving the value of the ideal shear strength for the copper crystal under a superimposed hydrostatic stress. The calculated value of the critical indentation depth is in a very good correspondence with that of the experimentally observed pop-in on the load-displacement curve. The value of the Young modulus of tungsten received from the reduced modulus of elasticity of the original Hertz model is also in an excellent agreement with experimental data. This offers us a possibility to assess the concentration of alloying and impurity elements in the surface and sub-surface layers.

Keywords

Nanoindentation; Ab initio calculation; Ideal shear strength; Tungsten crystal; Finite element analysis

Key words in English

Nanoindentation; Ab initio calculation; Ideal shear strength; Tungsten crystal; Finite element analysis

Authors

ŠANDERA, P.; POKLUDA, J.; SCHÖBERL, T.; HORNÍKOVÁ, J.; ČERNÝ, M.

RIV year

2015

Released

01.01.2014

Publisher

Elsevier

ISBN

2211-8128

Periodical

Procedia Materials Science

Volume

3

Number

1

State

Kingdom of the Netherlands

Pages from

1111

Pages to

1116

Pages count

6

BibTex

@article{BUT111352,
  author="Pavel {Šandera} and Jaroslav {Pokluda} and Thomas {Schöberl} and Jana {Horníková} and Miroslav {Černý}",
  title="Modeling Load-displacement Curve and Pop-in Effect in Nanoindentation Tests",
  journal="Procedia Materials Science",
  year="2014",
  volume="3",
  number="1",
  pages="1111--1116",
  doi="10.1016/j.mspro.2014.06.181",
  issn="2211-8128"
}