Detail publikačního výsledku

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

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

Originální název

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

Anglický název

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

Druh

Článek WoS

Originální abstrakt

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.

Anglický abstrakt

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.

Klíčová slova

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

Klíčová slova v angličtině

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

Autoři

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

Rok RIV

2015

Vydáno

01.01.2014

Nakladatel

Elsevier

ISSN

2211-8128

Periodikum

Procedia Materials Science

Svazek

3

Číslo

1

Stát

Nizozemsko

Strany od

1111

Strany do

1116

Strany počet

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"
}