Publication detail

Dislocation-based model of plasticity and roughness-induced crack closure

POKLUDA, J.

Original Title

Dislocation-based model of plasticity and roughness-induced crack closure

Type

journal article in Web of Science

Language

English

Original Abstract

The paper presents a discrete dislocation model of contact shielding effects in the case of small-scale yielding under plane-strain conditions. The model is physically transparent and, unlike continuum-based models for plane stress, it enables us to directly assess the magnitude of both plasticity and roughness-induced components of crack closure. Moreover, it reflects an influence of microstructure on the roughness-induced term. The closure components can be simply extracted from experimentally measured values of the remote DK using standard data on mechanical properties and microstructure. Thus, the effective threshold DKeff,th can be obtained as nearly independent of microstructure coarseness and applied cyclic ratio as shown for several important engineering materials

Keywords

Crack-tip shielding, Discrete dislocations, Fatigue crack-growth, Effective threshold, Size ratio

Authors

POKLUDA, J.

RIV year

2013

Released

15. 1. 2013

ISBN

0142-1123

Periodical

INTERNATIONAL JOURNAL OF FATIGUE

Year of study

46

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

35

Pages to

40

Pages count

6

BibTex

@article{BUT99299,
  author="Jaroslav {Pokluda}",
  title="Dislocation-based model of plasticity and roughness-induced crack closure",
  journal="INTERNATIONAL JOURNAL OF FATIGUE",
  year="2013",
  volume="46",
  number="1",
  pages="35--40",
  doi="10.1016/j.ijfatigue.2011.11.016",
  issn="0142-1123"
}