Publication detail

A novel multiscale approach to brittle fracture of nano/micro-sized components

KOTOUL, M. SKALKA, P. PROFANT, T. ŘEHÁK, P. ŠESTÁK, P. ČERNÝ, M. POKLUDA, J.

Original Title

A novel multiscale approach to brittle fracture of nano/micro-sized components

Type

journal article in Web of Science

Language

English

Original Abstract

Principles and advantages of a new concept based on the ab initio aided strain gradient elasticity theory are shown in comparison with the classical Barenblatt cohesive model. The method is applied to the theoretical prediction of the critical energy release rate and the crack tip opening displacement at the crack instability in nanopanels made of germanium and molybdenum crystals. The necessary length scale parameter l1 is determined for germanium and molybdenum by the best gradient elasticity fits of ab initio computed screw dislocation displacements and phonon dispersions. Values of ab initio computed critical energy release rates and crack opening profiles revealed that the length l1 is related to inflexion points of profiles. A novel ab initio method in combination with continuum mechanics was successfully tested to replace molecular statics dependent of availability of interatomic potentials. The asymptotic strain gradient elasticity solution for displacement components near the crack tip in materials with cubic lattice was also derived.

Keywords

DFT; FEM; fracture nanomechanics; size-dependent phenomena; strain gradient elasticity

Authors

KOTOUL, M.; SKALKA, P.; PROFANT, T.; ŘEHÁK, P.; ŠESTÁK, P.; ČERNÝ, M.; POKLUDA, J.

Released

29. 8. 2020

ISBN

8756-758X

Periodical

Fatigue & Fracture of Engineering Materials & Structures

Year of study

43

Number

8

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1630

Pages to

1645

Pages count

16

URL

https://onlinelibrary.wiley.com/doi/full/10.1111/ffe.13179

BibTex

@article{BUT160769,
  author="Michal {Kotoul} and Petr {Skalka} and Tomáš {Profant} and Petr {Řehák} and Petr {Šesták} and Miroslav {Černý} and Jaroslav {Pokluda}",
  title="A novel multiscale approach to brittle fracture of nano/micro-sized components",
  journal="Fatigue & Fracture of Engineering Materials & Structures",
  year="2020",
  volume="43",
  number="8",
  pages="1630--1645",
  doi="10.1111/ffe.13179",
  issn="8756-758X",
  url="https://onlinelibrary.wiley.com/doi/full/10.1111/ffe.13179"
}